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Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2019	Feb. 24, 2020	Jun. 30, 2019
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-38515
Entity Registrant Name	EVERGY, INC.
Entity Tax Identification Number	82-2733395
Entity Incorporation, State or Country Code	MO
Entity Address, Address Line One	1200 Main Street
Entity Address, City or Town	Kansas City
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	64105
City Area Code	816
Local Phone Number	556-2200
Title of 12(b) Security	Evergy, Inc. common stock
Trading Symbol	EVRG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 14,138,041,261
Entity Common Stock, Shares Outstanding		226,659,013
Documents Incorporated by Reference	Portions of the 2020 annual meeting proxy statement of Evergy, Inc. to be filed with the Securities and Exchange Commission are incorporated by reference in Part III of this report.
Entity Central Index Key	0001711269
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Fiscal Year Focus	2019
Evergy Kansas Central
Entity Information [Line Items]
Entity File Number	001-03523
Entity Registrant Name	EVERGY KANSAS CENTRAL, INC.
Entity Tax Identification Number	48-0290150
Entity Incorporation, State or Country Code	KS
Entity Address, Address Line One	818 South Kansas Avenue
Entity Address, City or Town	Topeka
Entity Address, State or Province	KS
Entity Address, Postal Zip Code	66612
City Area Code	785
Local Phone Number	575-6300
Entity Information, Former Legal or Registered Name	Westar Energy, Inc.
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1
Entity Central Index Key	0000054507
Evergy Metro
Entity Information [Line Items]
Entity File Number	000-51873
Entity Registrant Name	EVERGY METRO, INC.
Entity Tax Identification Number	44-0308720
Entity Incorporation, State or Country Code	MO
Entity Address, Address Line One	1200 Main Street
Entity Address, City or Town	Kansas City
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	64105
City Area Code	816
Local Phone Number	556-2200
Entity Information, Former Legal or Registered Name	Kansas City Power & Light Company
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1
Entity Central Index Key	0000054476

Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
OPERATING REVENUES	$ 5,147.8	$ 4,275.9	$ 2,571.0
OPERATING EXPENSES:
Fuel and purchased power	1,265.0	1,078.7	541.5
SPP network transmission costs	251.3	259.9	247.9
Operating and maintenance	1,218.5	1,115.8	563.5
Depreciation and amortization	861.7	618.8	371.7
Taxes other than income tax	365.5	269.1	167.6
Total Operating Expenses	3,962.0	3,342.3	1,892.2
INCOME FROM OPERATIONS	1,185.8	933.6	678.8
OTHER INCOME (EXPENSE):
Investment earnings	11.0	8.8	4.0
Other income	26.9	15.5	8.3
Other expense	(76.9)	(78.7)	(39.1)
Total Other Expense, Net	(39.0)	(54.4)	(26.8)
Interest expense	374.0	279.6	171.0
INCOME BEFORE INCOME TAXES	772.8	599.6	481.0
Income tax expense	97.0	59.0	151.2
Equity in earnings of equity method investees, net of income taxes	9.8	5.4	6.7
NET INCOME	685.6	546.0	336.5
Less: Net income attributable to noncontrolling interests	15.7	10.2	12.6
Net income attributable to Evergy, Inc.	$ 669.9	$ 535.8	$ 323.9
BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO EVERGY (see Note 1)
Basic earnings per common share (in dollars per share)	$ 2.80	$ 2.50	$ 2.27
Diluted earnings per common share (in dollars per share)	$ 2.79	$ 2.50	$ 2.27
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	239.5	213.9	142.5
Diluted (in shares)	239.9	214.1	142.6
COMPREHENSIVE INCOME
Net income	$ 685.6	$ 546.0	$ 336.5
Derivative hedging activity
Loss on derivative hedging instruments	(64.4)	(5.4)
Loss on derivative hedging instruments			0.0
Income tax benefit	16.5	1.4
Income tax benefit			0.0
Net loss on derivative hedging instruments	(47.9)	(4.0)
Net loss on derivative hedging instruments			0.0
Reclassification to expenses, net of tax	1.5	0.0
Reclassification to expenses, net of tax			0.0
Derivative hedging activity, net of tax	(46.4)	(4.0)
Derivative hedging activity, net of tax			0.0
Defined benefit pension plans
Net gain (loss) arising during period	(0.8)	1.4	0.0
Income tax expense (benefit)	0.2	(0.4)	0.0
Net gain (loss) arising during period	(0.6)	1.0	0.0
Change in unrecognized pension expense, net of tax	(0.6)	1.0	0.0
Total other comprehensive income (loss)	(47.0)	(3.0)	0.0
COMPREHENSIVE INCOME	638.6	543.0	336.5
Less: comprehensive income attributable to noncontrolling interest	15.7	10.2	12.6
COMPREHENSIVE INCOME	$ 622.9	$ 532.8	$ 323.9

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 23.2	$ 160.3
Receivables, net	228.5	193.7
Accounts receivable pledged as collateral	339.0	365.0
Fuel inventory and supplies	481.6	511.0
Income taxes receivable	85.5	68.0
Regulatory assets	231.7	303.9
Prepaid expenses and other assets	78.2	79.1
Total Current Assets	1,467.7	1,681.0
PROPERTY, PLANT AND EQUIPMENT, NET	19,184.4	18,782.5
OTHER ASSETS:
Regulatory assets	1,740.5	1,757.9
Nuclear decommissioning trust fund	573.2	472.1
Goodwill	2,336.6	2,338.9
Other	511.5	396.5
Total Other Assets	5,161.8	4,965.4
TOTAL ASSETS	25,975.9	25,598.1
CURRENT LIABILITIES:
Current maturities of long-term debt	251.1	705.4
Notes payable and commercial paper	561.9	738.6
Collateralized note payable	339.0	365.0
Accounts payable	528.8	451.5
Accrued taxes	145.1	133.6
Accrued interest	122.3	110.9
Regulatory liabilities	63.3	110.2
Asset retirement obligations	71.3	49.8
Other	220.8	171.9
Total Current Liabilities	2,335.9	2,867.2
LONG-TERM LIABILITIES:
Long-term debt, net	8,746.7	6,636.3
Deferred income taxes	1,744.4	1,599.2
Unamortized investment tax credits	375.4	373.2
Regulatory liabilities	2,248.3	2,218.8
Pension and post-retirement liability	1,017.6	987.6
Total noncurrent asset retirement obligation	602.8	637.3
Other	340.7	236.7
Total Long-Term Liabilities	15,094.7	12,740.2
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value 226,641,443 and 255,326,252 shares issued, stated value	7,070.4	8,685.2
Retained earnings	1,551.5	1,346.0
Accumulated other comprehensive loss	(50.0)	(3.0)
Total Evergy, Inc. Shareholders' Equity	8,571.9	10,028.2
Noncontrolling Interests	(26.6)	(37.5)
Total Equity	8,545.3	9,990.7
TOTAL LIABILITIES AND EQUITY	25,975.9	25,598.1
Variable Interest Entities
CURRENT ASSETS:
PROPERTY, PLANT AND EQUIPMENT, NET	162.0	169.2
CURRENT LIABILITIES:
Current maturities of long-term debt	32.3	30.3
Accrued interest	0.3	0.5
LONG-TERM LIABILITIES:
Long-term debt, net	$ 18.8	$ 51.1

Consolidated Balance Sheets (Parenthetical) - shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock - shares authorized (in shares)	600,000,000	600,000,000
Common stock - shares issued (in shares)	226,641,443	255,326,252

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 685.6	$ 546.0	$ 336.5
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	861.7	618.8	371.7
Amortization of nuclear fuel	51.4	43.6	32.2
Amortization of deferred refueling outage	25.5	21.2	16.1
Amortization of corporate-owned life insurance	19.8	22.6	20.6
Non-cash compensation	16.3	29.9	8.8
Net deferred income taxes and credits	121.5	124.2	149.6
Allowance for equity funds used during construction	(2.2)	(3.1)	(2.0)
Payments for asset retirement obligations	(17.8)	(22.4)	(16.0)
Equity in earnings of equity method investees, net of income taxes	(9.8)	(5.4)	(6.7)
Income from corporate-owned life insurance	(29.6)	(2.3)	(2.8)
Other	(3.2)	(5.2)	(8.7)
Changes in working capital items:
Accounts receivable from subsidiaries	(23.1)	265.1	(2.1)
Accounts receivable pledged as collateral	26.0	(185.0)	0.0
Fuel inventory and supplies	29.9	54.7	7.2
Prepaid expenses and other current assets	43.4	(128.1)	55.8
Accounts payable	16.9	56.7	10.0
Accrued taxes	(8.2)	(76.4)	9.2
Other current liabilities	(59.4)	92.0	(118.0)
Changes in other assets	79.8	66.8	32.0
Changes in other liabilities	(75.5)	(15.9)	19.3
Cash Flows from Operating Activities	1,749.0	1,497.8	912.7
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(1,210.1)	(1,069.7)	(764.6)
Cash acquired from the merger with Great Plains Energy	0.0	1,154.2	0.0
Purchase of securities - trusts	(55.8)	(117.5)	(41.0)
Sale of securities - trusts	47.3	117.7	41.2
Investment in corporate-owned life insurance	(18.3)	(17.1)	(17.0)
Proceeds from investment in corporate-owned life insurance	161.7	6.8	4.2
Proceeds from settlement of interest rate swap	0.0	140.6	0.0
Other investing activities	(5.1)	(17.6)	(3.6)
Cash Flows from (used in) Investing Activities	(1,080.3)	197.4	(780.8)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net	(176.7)	(104.0)	(91.3)
Proceeds from term loan facility	1,000.0	0.0	0.0
Repayment of term loan facility	(1,000.0)	0.0	0.0
Collateralized short-term borrowings, net	(26.0)	185.0	0.0
Proceeds from long-term debt	2,372.7	290.9	296.2
Retirements of long-term debt	(701.1)	(395.8)	(125.0)
Retirements of long-term debt of variable interest entities	(30.3)	(28.5)	(26.8)
Payment for settlement of interest rate swap accounted for as a cash flow hedge	(69.8)	0.0	0.0
Borrowings against cash surrender value of corporate-owned life insurance	59.4	56.5	55.1
Repayment of borrowings against cash surrender value of corporate-owned life insurance	(127.5)	(3.9)	(1.0)
Cash dividends paid	(462.5)	(475.0)	(223.1)
Repurchase of common stock under repurchase plan	(1,628.7)	(1,042.3)	0.0
Distributions to shareholders of noncontrolling interests	(8.6)	0.0	(5.8)
Other financing activities	(6.7)	(21.3)	(9.9)
Cash Flows from (used in) Financing Activities	(805.8)	(1,538.4)	(131.6)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(137.1)	156.8	0.3
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	160.3	3.5	3.2
End of period	$ 23.2	$ 160.3	$ 3.5

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Retained earnings	AOCI	Non-controlling interests
Beginning balance (in shares) at Dec. 31, 2016		141,791,153
Beginning balance at Dec. 31, 2016	$ 3,833.2	$ 2,727.3	$ 1,078.6	$ 0.0	$ 27.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	336.5		323.9		12.6
Issuance of stock (in shares)		12,131
Issuance of stock	0.6	$ 0.6
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		290,991
Issuance of stock compensation and reinvested dividends, net of tax withholding	(1.9)	$ (1.9)
Dividends declared on common stock	(229.2)		(229.2)
Stock compensation expense	8.8	$ 8.8
Deconsolidation of noncontrolling interests	(81.9)				(81.9)
Distributions to shareholders of noncontrolling interests	(5.7)				(5.7)
Change in unrecognized pension expense, net of tax	0.0
Ending balance (in shares) at Dec. 31, 2017		142,094,275
Ending balance at Dec. 31, 2017	3,860.4	$ 2,734.8	1,173.3	0.0	(47.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	546.0		535.8		10.2
Issuance of stock (in shares)		128,947,518
Issuance of stock	6,979.9	$ 6,979.9
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		533,273
Issuance of stock compensation and reinvested dividends, net of tax withholding	(16.7)	$ (16.7)
Dividends declared on common stock	(362.1)		(362.1)
Stock compensation expense	29.9	$ 29.9
Issuance of restricted common stock (in shares)		122,505
Dividend equivalents declared	(1.0)		(1.0)
Repurchase of common stock (in shares)		(16,371,319)
Repurchase of common stock	(1,042.3)	$ (1,042.3)
Derivative hedging activity, net of tax	(4.0)			(4.0)
Change in unrecognized pension expense, net of tax	1.0			1.0
Other	(0.4)	$ (0.4)
Ending balance (in shares) at Dec. 31, 2018		255,326,252
Ending balance at Dec. 31, 2018	9,990.7	$ 8,685.2	1,346.0	(3.0)	(37.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	685.6		669.9		15.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		111,849
Issuance of stock compensation and reinvested dividends, net of tax withholding	(2.4)	$ (2.4)
Dividends declared on common stock	(462.5)		(462.5)
Stock compensation expense	16.3	$ 16.3
Deconsolidation of noncontrolling interests	3.8				3.8
Distributions to shareholders of noncontrolling interests	(8.6)				(8.6)
Dividend equivalents declared	(1.9)		(1.9)
Repurchase of common stock (in shares)		(28,796,658)
Repurchase of common stock	(1,628.7)	$ (1,628.7)
Derivative hedging activity, net of tax	(46.4)			(46.4)
Change in unrecognized pension expense, net of tax	(0.6)			(0.6)
Ending balance (in shares) at Dec. 31, 2019		226,641,443
Ending balance at Dec. 31, 2019	$ 8,545.3	$ 7,070.4	$ 1,551.5	$ (50.0)	$ (26.6)

Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 1.93	$ 1.735	$ 1.60

Consolidated Statements of Income - Evergy Kansas Central, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING REVENUES	$ 5,147.8	$ 4,275.9	$ 2,571.0
OPERATING EXPENSES:
Fuel and purchased power	1,265.0	1,078.7	541.5
SPP network transmission costs	251.3	259.9	247.9
Operating and maintenance	1,218.5	1,115.8	563.5
Depreciation and amortization	861.7	618.8	371.7
Taxes other than income tax	365.5	269.1	167.6
Total Operating Expenses	3,962.0	3,342.3	1,892.2
INCOME FROM OPERATIONS	1,185.8	933.6	678.8
OTHER INCOME (EXPENSE):
Investment earnings (loss)	11.0	8.8	4.0
Other income	26.9	15.5	8.3
Other expense	(76.9)	(78.7)	(39.1)
Total Other Expense, Net	(39.0)	(54.4)	(26.8)
Interest expense	374.0	279.6	171.0
INCOME BEFORE INCOME TAXES	772.8	599.6	481.0
Income tax expense (benefit)	97.0	59.0	151.2
Equity in earnings of equity method investees, net of income taxes	9.8	5.4	6.7
NET INCOME	685.6	546.0	336.5
Less: Net income attributable to noncontrolling interests	15.7	10.2	12.6
Net income attributable to Evergy, Inc.	669.9	535.8	323.9
Evergy Kansas Central
OPERATING REVENUES	2,507.4	2,614.9	2,571.0
OPERATING EXPENSES:
Fuel and purchased power	493.0	599.2	541.5
SPP network transmission costs	251.3	259.9	247.9
Operating and maintenance	530.5	640.7	563.5
Depreciation and amortization	443.8	390.9	371.7
Taxes other than income tax	192.3	173.7	167.6
Total Operating Expenses	1,910.9	2,064.4	1,892.2
INCOME FROM OPERATIONS	596.5	550.5	678.8
OTHER INCOME (EXPENSE):
Investment earnings (loss)	4.1	(0.6)	4.0
Other income	23.1	13.9	8.3
Other expense	(40.1)	(46.8)	(39.1)
Total Other Expense, Net	(12.9)	(33.5)	(26.8)
Interest expense	177.0	176.8	171.0
INCOME BEFORE INCOME TAXES	406.6	340.2	481.0
Income tax expense (benefit)	52.1	(4.3)	151.2
Equity in earnings of equity method investees, net of income taxes	4.6	4.6	6.7
NET INCOME	359.1	349.1	336.5
Less: Net income attributable to noncontrolling interests	15.7	10.2	12.6
Net income attributable to Evergy, Inc.	$ 343.4	$ 338.9	$ 323.9

Consolidated Balance Sheets - Evergy Kansas Central, Inc - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 23.2	$ 160.3
Receivables, net	228.5	193.7
Accounts receivable pledged as collateral	339.0	365.0
Fuel inventory and supplies	481.6	511.0
Income taxes receivable	85.5	68.0
Regulatory assets	231.7	303.9
Prepaid expenses and other assets	78.2	79.1
Total Current Assets	1,467.7	1,681.0
PROPERTY, PLANT AND EQUIPMENT, NET	19,184.4	18,782.5
OTHER ASSETS:
Regulatory assets	1,740.5	1,757.9
Nuclear decommissioning trust fund	573.2	472.1
Other	511.5	396.5
Total Other Assets	5,161.8	4,965.4
TOTAL ASSETS	25,975.9	25,598.1
CURRENT LIABILITIES:
Current maturities of long-term debt	251.1	705.4
Notes payable and commercial paper	561.9	738.6
Collateralized note payable	339.0	365.0
Accounts payable	528.8	451.5
Accrued taxes	145.1	133.6
Accrued interest	122.3	110.9
Regulatory liabilities	63.3	110.2
Asset retirement obligations	71.3	49.8
Other	220.8	171.9
Total Current Liabilities	2,335.9	2,867.2
LONG-TERM LIABILITIES:
Long-term debt, net	8,746.7	6,636.3
Deferred income taxes	1,744.4	1,599.2
Unamortized investment tax credits	375.4	373.2
Regulatory liabilities	2,248.3	2,218.8
Pension and post-retirement liability	1,017.6	987.6
Total noncurrent asset retirement obligation	602.8	637.3
Other	340.7	236.7
Total Long-Term Liabilities	15,094.7	12,740.2
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 1,000 shares authorized, $0.01 par value, 1 share issued	7,070.4	8,685.2
Retained earnings	1,551.5	1,346.0
Total Evergy, Inc. Shareholders' Equity	8,571.9	10,028.2
Noncontrolling Interests	(26.6)	(37.5)
Total Equity	8,545.3	9,990.7
TOTAL LIABILITIES AND EQUITY	25,975.9	25,598.1
Evergy Kansas Central
CURRENT ASSETS:
Cash and cash equivalents	5.2	44.5
Receivables, net	140.4	84.3
Related party receivables	9.9	2.6
Accounts receivable pledged as collateral	171.0	185.0
Fuel inventory and supplies	266.4	276.8
Income taxes receivable	30.4	42.7
Regulatory assets	93.3	97.1
Prepaid expenses and other assets	34.3	35.0
Total Current Assets	750.9	768.0
PROPERTY, PLANT AND EQUIPMENT, NET	9,864.9	9,718.3
OTHER ASSETS:
Regulatory assets	730.4	700.4
Nuclear decommissioning trust fund	272.5	227.5
Other	266.0	233.4
Total Other Assets	1,268.9	1,161.3
TOTAL ASSETS	12,046.7	11,816.8
CURRENT LIABILITIES:
Current maturities of long-term debt	250.0	300.0
Notes payable and commercial paper	249.2	411.7
Collateralized note payable	171.0	185.0
Accounts payable	200.5	154.4
Related party payables	14.8	14.9
Accrued taxes	98.7	88.6
Accrued interest	74.2	74.4
Regulatory liabilities	42.3	19.5
Asset retirement obligations	23.3	17.1
Other	130.2	83.0
Total Current Liabilities	1,286.5	1,378.9
LONG-TERM LIABILITIES:
Long-term debt, net	3,436.1	3,389.8
Deferred income taxes	817.7	815.4
Unamortized investment tax credits	253.2	249.7
Regulatory liabilities	1,132.5	1,101.8
Pension and post-retirement liability	495.5	474.7
Total noncurrent asset retirement obligation	249.6	264.0
Other	151.8	130.7
Total Long-Term Liabilities	6,555.2	6,477.2
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 1,000 shares authorized, $0.01 par value, 1 share issued	2,737.6	2,737.6
Retained earnings	1,494.0	1,260.6
Total Evergy, Inc. Shareholders' Equity	4,231.6	3,998.2
Noncontrolling Interests	(26.6)	(37.5)
Total Equity	4,205.0	3,960.7
TOTAL LIABILITIES AND EQUITY	12,046.7	11,816.8
Variable Interest Entities
CURRENT ASSETS:
PROPERTY, PLANT AND EQUIPMENT, NET	162.0	169.2
CURRENT LIABILITIES:
Current maturities of long-term debt	32.3	30.3
Accrued interest	0.3	0.5
LONG-TERM LIABILITIES:
Long-term debt, net	18.8	51.1
Variable Interest Entities \| Evergy Kansas Central
CURRENT ASSETS:
PROPERTY, PLANT AND EQUIPMENT, NET	162.0	169.2
CURRENT LIABILITIES:
Current maturities of long-term debt	32.3	30.3
Accrued interest	0.3	0.5
LONG-TERM LIABILITIES:
Long-term debt, net	$ 18.8	$ 51.1

Consolidated Balance Sheets - Evergy Kansas Central, Inc (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Common stock - shares authorized (in shares)	600,000,000	600,000,000
Common stock - shares issued (in shares)	226,641,443	255,326,252
Evergy Kansas Central
Common stock - shares authorized (in shares)	1,000	1,000
Common stock - par value (in dollars per share)	$ 0.01	$ 0.01
Common stock - shares issued (in shares)	1	1

Consolidated Statements of Cash Flows - Evergy Kansas Central, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 685.6	$ 546.0	$ 336.5
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	861.7	618.8	371.7
Amortization of nuclear fuel	51.4	43.6	32.2
Amortization of deferred refueling outage	25.5	21.2	16.1
Amortization of corporate-owned life insurance	19.8	22.6	20.6
Non-cash compensation	16.3	29.9	8.8
Net deferred income taxes and credits	121.5	124.2	149.6
Allowance for equity funds used during construction	(2.2)	(3.1)	(2.0)
Payments for asset retirement obligations	(17.8)	(22.4)	(16.0)
Equity in earnings of equity method investees, net of income taxes	(9.8)	(5.4)	(6.7)
Income from corporate-owned life insurance	(29.6)	(2.3)	(2.8)
Other	(3.2)	(5.2)	(8.7)
Changes in working capital items:
Accounts receivable from subsidiaries	(23.1)	265.1	(2.1)
Accounts receivable pledged as collateral	26.0	(185.0)	0.0
Fuel inventory and supplies	29.9	54.7	7.2
Prepaid expenses and other current assets	43.4	(128.1)	55.8
Accounts payable	16.9	56.7	10.0
Accrued taxes	(8.2)	(76.4)	9.2
Other current liabilities	(59.4)	92.0	(118.0)
Changes in other assets	79.8	66.8	32.0
Changes in other liabilities	(75.5)	(15.9)	19.3
Cash Flows from Operating Activities	1,749.0	1,497.8	912.7
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(1,210.1)	(1,069.7)	(764.6)
Purchase of securities - trusts	(55.8)	(117.5)	(41.0)
Sale of securities - trusts	47.3	117.7	41.2
Investment in corporate-owned life insurance	(18.3)	(17.1)	(17.0)
Proceeds from investment in corporate-owned life insurance	161.7	6.8	4.2
Other investing activities	(5.1)	(17.6)	(3.6)
Cash Flows from (used in) Investing Activities	(1,080.3)	197.4	(780.8)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net	(176.7)	(104.0)	(91.3)
Collateralized short-term debt, net	(26.0)	185.0	0.0
Proceeds from long-term debt	2,372.7	290.9	296.2
Retirements of long-term debt	(701.1)	(395.8)	(125.0)
Retirements of long-term debt of variable interest entities	(30.3)	(28.5)	(26.8)
Borrowings against cash surrender value of corporate-owned life insurance	59.4	56.5	55.1
Repayment of borrowings against cash surrender value of corporate-owned life insurance	(127.5)	(3.9)	(1.0)
Cash dividends paid	(462.5)	(475.0)	(223.1)
Distributions to shareholders of noncontrolling interests	(8.6)	0.0	(5.8)
Other financing activities	(6.7)	(21.3)	(9.9)
Cash Flows from (used in) Financing Activities	(805.8)	(1,538.4)	(131.6)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(137.1)	156.8	0.3
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	160.3	3.5	3.2
End of period	23.2	160.3	3.5
Evergy Kansas Central
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	359.1	349.1	336.5
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	443.8	390.9	371.7
Amortization of nuclear fuel	25.6	26.0	32.2
Amortization of deferred refueling outage	12.8	13.7	16.1
Amortization of corporate-owned life insurance	19.8	22.6	20.6
Non-cash compensation	0.0	19.9	8.8
Net deferred income taxes and credits	11.6	(2.2)	149.6
Allowance for equity funds used during construction	0.0	(2.9)	(2.0)
Payments for asset retirement obligations	(14.8)	(12.0)	(16.0)
Equity in earnings of equity method investees, net of income taxes	(4.6)	(4.6)	(6.7)
Income from corporate-owned life insurance	(29.0)	(2.3)	(2.8)
Other	(5.5)	(5.4)	(8.7)
Changes in working capital items:
Accounts receivable from subsidiaries	(65.9)	207.9	(2.1)
Accounts receivable pledged as collateral	14.0	(185.0)	0.0
Fuel inventory and supplies	10.9	17.3	7.2
Prepaid expenses and other current assets	(11.7)	(134.2)	55.8
Accounts payable	6.9	(17.6)	10.0
Accrued taxes	20.2	(24.1)	9.2
Other current liabilities	12.1	88.3	(118.0)
Changes in other assets	47.0	42.7	32.0
Changes in other liabilities	(29.5)	(36.2)	19.3
Cash Flows from Operating Activities	822.8	751.9	912.7
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(596.1)	(713.3)	(764.6)
Purchase of securities - trusts	(21.8)	(99.4)	(41.0)
Sale of securities - trusts	21.6	104.2	41.2
Investment in corporate-owned life insurance	(17.6)	(17.1)	(17.0)
Proceeds from investment in corporate-owned life insurance	158.9	6.8	4.2
Other investing activities	(3.2)	(8.6)	(3.6)
Cash Flows from (used in) Investing Activities	(458.2)	(727.4)	(780.8)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net	(162.5)	133.7	(91.3)
Collateralized short-term debt, net	(14.0)	185.0	0.0
Proceeds from long-term debt	294.7	121.9	296.2
Retirements of long-term debt	(300.0)	(121.9)	(125.0)
Retirements of long-term debt of variable interest entities	(30.3)	(28.5)	(26.8)
Borrowings against cash surrender value of corporate-owned life insurance	56.5	56.5	55.1
Repayment of borrowings against cash surrender value of corporate-owned life insurance	(125.4)	(3.9)	(1.0)
Cash dividends paid	(110.0)	(305.1)	(223.1)
Distributions to shareholders of noncontrolling interests	(8.6)	0.0	(5.8)
Other financing activities	(4.3)	(21.2)	(9.9)
Cash Flows from (used in) Financing Activities	(403.9)	16.5	(131.6)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(39.3)	41.0	0.3
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	44.5	3.5	3.2
End of period	$ 5.2	$ 44.5	$ 3.5

Consolidated Statements of Changes in Equity - Evergy Kansas Central, Inc - USD ($) $ in Millions	Total	Common Stock	Retained earnings	Non-controlling interests	Evergy Kansas Central	Evergy Kansas Central Common Stock	Evergy Kansas Central Retained earnings	Evergy Kansas Central Non-controlling interests
Beginning balance (in shares) at Dec. 31, 2016		141,791,153				141,791,153
Beginning balance at Dec. 31, 2016	$ 3,833.2	$ 2,727.3	$ 1,078.6	$ 27.3	$ 3,833.2	$ 2,727.3	$ 1,078.6	$ 27.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	336.5		323.9	12.6	336.5		323.9	12.6
Issuance of stock (in shares)		12,131				12,131
Issuance of stock	0.6	$ 0.6			0.6	$ 0.6
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		290,991				290,991
Issuance of stock for compensation and reinvested dividends, net of tax withholding	(1.9)	$ (1.9)			(1.9)	$ (1.9)
Dividends declared on common stock	(229.2)		(229.2)		(229.2)		(229.2)
Stock compensation expense	8.8	$ 8.8			8.8	$ 8.8
Consolidation of noncontrolling interests	(81.9)			(81.9)	(81.9)			(81.9)
Distributions to shareholders of noncontrolling interests	(5.7)			(5.7)	(5.7)			(5.7)
Ending balance (in shares) at Dec. 31, 2017		142,094,275				142,094,275
Ending balance at Dec. 31, 2017	3,860.4	$ 2,734.8	1,173.3	(47.7)	3,860.4	$ 2,734.8	1,173.3	(47.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	546.0		535.8	10.2	349.1		338.9	10.2
Issuance of stock (in shares)		128,947,518
Issuance of stock	6,979.9	$ 6,979.9
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		533,273				516,990
Issuance of stock for compensation and reinvested dividends, net of tax withholding	(16.7)	$ (16.7)			(17.2)	$ (17.2)
Dividends declared on common stock	(362.1)		(362.1)		(251.6)		(251.6)
Stock cancelled pursuant to Amended Merger Agreement (in shares)						(142,611,264)
Stock cancelled pursuant to Amended Merger Agreement					0.0
Stock compensation expense	29.9	29.9			19.9	$ 19.9
Other	(0.4)	$ (0.4)			0.1	$ 0.1
Ending balance (in shares) at Dec. 31, 2018		255,326,252				1
Ending balance at Dec. 31, 2018	9,990.7	$ 8,685.2	1,346.0	(37.5)	3,960.7	$ 2,737.6	1,260.6	(37.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	685.6		669.9	15.7	359.1		343.4	15.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		111,849
Issuance of stock for compensation and reinvested dividends, net of tax withholding	(2.4)	$ (2.4)
Dividends declared on common stock	(462.5)		(462.5)		(110.0)		(110.0)
Stock compensation expense	16.3	$ 16.3
Consolidation of noncontrolling interests	3.8			3.8	3.8			3.8
Distributions to shareholders of noncontrolling interests	(8.6)			(8.6)	(8.6)
Ending balance (in shares) at Dec. 31, 2019		226,641,443				1
Ending balance at Dec. 31, 2019	$ 8,545.3	$ 7,070.4	$ 1,551.5	$ (26.6)	$ 4,205.0	$ 2,737.6	$ 1,494.0	$ (26.6)

Consolidated Statements of Comprehensive Income - Evergy Metro, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING REVENUES	$ 5,147.8	$ 4,275.9	$ 2,571.0
OPERATING EXPENSES:
Fuel and purchased power	1,265.0	1,078.7	541.5
Operating and maintenance	1,218.5	1,115.8	563.5
Depreciation and amortization	861.7	618.8	371.7
Taxes other than income tax	365.5	269.1	167.6
Total Operating Expenses	3,962.0	3,342.3	1,892.2
INCOME FROM OPERATIONS	1,185.8	933.6	678.8
OTHER INCOME (EXPENSE):
Investment earnings	11.0	8.8	4.0
Other income	26.9	15.5	8.3
Other expense	(76.9)	(78.7)	(39.1)
Total Other Expense, Net	(39.0)	(54.4)	(26.8)
Interest expense	374.0	279.6	171.0
INCOME BEFORE INCOME TAXES	772.8	599.6	481.0
Income tax expense	97.0	59.0	151.2
Net income attributable to Evergy, Inc.	669.9	535.8	323.9
Derivative hedging activity
Reclassification to expenses, net of tax:	(1.5)	0.0
Reclassification to expenses, net of tax:			0.0
Derivative hedging activity, net of tax	(46.4)	(4.0)
Derivative hedging activity, net of tax			0.0
Total other comprehensive income (loss)	(47.0)	(3.0)	0.0
COMPREHENSIVE INCOME	622.9	532.8	323.9
Evergy Metro
OPERATING REVENUES	1,806.5	1,823.1	1,890.7
OPERATING EXPENSES:
Fuel and purchased power	482.1	520.6	480.7
Operating and maintenance	451.9	494.2	474.8
Depreciation and amortization	318.4	281.3	266.3
Taxes other than income tax	127.6	117.2	182.5
Total Operating Expenses	1,380.0	1,413.3	1,404.3
INCOME FROM OPERATIONS	426.5	409.8	486.4
OTHER INCOME (EXPENSE):
Investment earnings	2.4	2.8	2.0
Other income	3.2	2.2	9.2
Other expense	(21.4)	(30.9)	(50.8)
Total Other Expense, Net	(15.8)	(25.9)	(39.6)
Interest expense	119.8	133.7	138.8
INCOME BEFORE INCOME TAXES	290.9	250.2	308.0
Income tax expense	35.7	87.3	128.2
Net income attributable to Evergy, Inc.	255.2	162.9	179.8
Derivative hedging activity
Reclassification to expenses, net of tax:	0.7	3.7
Reclassification to expenses, net of tax:			4.6
Derivative hedging activity, net of tax	0.7	3.7	4.6
Derivative hedging activity, net of tax			4.6
Total other comprehensive income (loss)	0.7	3.7	4.6
COMPREHENSIVE INCOME	$ 255.9	$ 166.6	$ 184.4

Consolidated Balance Sheets - Evergy Metro, Inc - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 23.2	$ 160.3
Receivables, net	228.5	193.7
Accounts receivable pledged as collateral	339.0	365.0
Fuel inventory and supplies	481.6	511.0
Income taxes receivable	85.5	68.0
Regulatory assets	231.7	303.9
Total Current Assets	1,467.7	1,681.0
PROPERTY, PLANT AND EQUIPMENT, NET	19,184.4	18,782.5
OTHER ASSETS:
Regulatory assets	1,740.5	1,757.9
Nuclear decommissioning trust fund	573.2	472.1
Other	511.5	396.5
Total Other Assets	5,161.8	4,965.4
TOTAL ASSETS	25,975.9	25,598.1
CURRENT LIABILITIES:
Current maturities of long-term debt	251.1	705.4
Notes payable and commercial paper	561.9	738.6
Collateralized note payable	339.0	365.0
Accounts payable	528.8	451.5
Accrued taxes	145.1	133.6
Accrued interest	122.3	110.9
Regulatory liabilities	63.3	110.2
Asset retirement obligations	71.3	49.8
Other	220.8	171.9
Total Current Liabilities	2,335.9	2,867.2
LONG-TERM LIABILITIES:
Long-term debt, net	8,746.7	6,636.3
Deferred income taxes	1,744.4	1,599.2
Unamortized investment tax credits	375.4	373.2
Regulatory liabilities	2,248.3	2,218.8
Pension and post-retirement liability	1,017.6	987.6
Total noncurrent asset retirement obligation	602.8	637.3
Other	340.7	236.7
Total Long-Term Liabilities	15,094.7	12,740.2
Commitments and Contingencies (Note 15)
EQUITY:
Common stock - 1,000 shares authorized, $0.01 par value, 1 share issued	7,070.4	8,685.2
Retained earnings	1,551.5	1,346.0
Accumulated other comprehensive loss	(50.0)	(3.0)
Total Evergy, Inc. Shareholders' Equity	8,571.9	10,028.2
TOTAL LIABILITIES AND EQUITY	25,975.9	25,598.1
Evergy Metro
CURRENT ASSETS:
Cash and cash equivalents	2.0	2.6
Receivables, net	48.1	62.7
Related party receivables	93.9	101.8
Accounts receivable pledged as collateral	118.0	130.0
Fuel inventory and supplies	163.0	177.6
Income taxes receivable	8.7	0.0
Regulatory assets	95.4	130.9
Prepaid expenses	22.8	20.1
Other assets	15.0	16.8
Total Current Assets	566.9	642.5
PROPERTY, PLANT AND EQUIPMENT, NET	6,839.0	6,688.1
OTHER ASSETS:
Regulatory assets	464.4	495.2
Nuclear decommissioning trust fund	300.7	244.6
Other	134.1	50.1
Total Other Assets	899.2	789.9
TOTAL ASSETS	8,305.1	8,120.5
CURRENT LIABILITIES:
Current maturities of long-term debt	0.0	400.0
Notes payable and commercial paper	199.3	176.9
Collateralized note payable	118.0	130.0
Accounts payable	233.6	211.1
Related party payables	4.6	0.0
Accrued taxes	38.8	39.7
Accrued interest	26.7	28.9
Regulatory liabilities	11.4	52.8
Asset retirement obligations	36.1	29.2
Accrued compensation benefits	45.1	52.5
Other	34.0	17.2
Total Current Liabilities	747.6	1,138.3
LONG-TERM LIABILITIES:
Long-term debt, net	2,525.0	2,130.1
Deferred income taxes	642.8	631.8
Unamortized investment tax credits	119.6	120.7
Regulatory liabilities	792.2	794.3
Pension and post-retirement liability	499.7	491.9
Total noncurrent asset retirement obligation	217.5	231.8
Other	180.0	81.8
Total Long-Term Liabilities	4,976.8	4,482.4
Commitments and Contingencies (Note 15)
EQUITY:
Common stock - 1,000 shares authorized, $0.01 par value, 1 share issued	1,563.1	1,563.1
Retained earnings	1,012.8	932.6
Accumulated other comprehensive loss	4.8	4.1
Total Evergy, Inc. Shareholders' Equity	2,580.7	2,499.8
TOTAL LIABILITIES AND EQUITY	$ 8,305.1	$ 8,120.5

Consolidated Balance Sheets - Evergy Metro, Inc (Parenthetical) - shares	Dec. 31, 2019	Dec. 31, 2018
Common stock - shares authorized (in shares)	600,000,000	600,000,000
Common stock - shares issued (in shares)	226,641,443	255,326,252
Evergy Metro
Common stock - shares authorized (in shares)	1,000	1,000
Common stock - shares issued (in shares)	1	1

Consolidated Statements of Cash Flows - Evergy Metro, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 685.6	$ 546.0	$ 336.5
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	861.7	618.8	371.7
Amortization of nuclear fuel	51.4	43.6	32.2
Amortization of deferred refueling outage	25.5	21.2	16.1
Net deferred income taxes and credits	121.5	124.2	149.6
Allowance for equity funds used during construction	(2.2)	(3.1)	(2.0)
Payments for asset retirement obligations	(17.8)	(22.4)	(16.0)
Other	(3.2)	(5.2)	(8.7)
Changes in working capital items:
Accounts receivable from subsidiaries	(23.1)	265.1	(2.1)
Accounts receivable pledged as collateral	26.0	(185.0)	0.0
Fuel inventory and supplies	29.9	54.7	7.2
Prepaid expenses and other current assets	43.4	(128.1)	55.8
Accounts payable	16.9	56.7	10.0
Accrued taxes	(8.2)	(76.4)	9.2
Other current liabilities	(59.4)	92.0	(118.0)
Changes in other assets	79.8	66.8	32.0
Changes in other liabilities	(75.5)	(15.9)	19.3
Cash Flows from Operating Activities	1,749.0	1,497.8	912.7
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(1,210.1)	(1,069.7)	(764.6)
Purchase of securities - trusts	(55.8)	(117.5)	(41.0)
Sale of securities - trusts	47.3	117.7	41.2
Other investing activities	(5.1)	(17.6)	(3.6)
Cash Flows from (used in) Investing Activities	(1,080.3)	197.4	(780.8)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net	(176.7)	(104.0)	(91.3)
Collateralized short-term debt, net	(26.0)	185.0	0.0
Proceeds from long-term debt	2,372.7	290.9	296.2
Retirements of long-term debt	(701.1)	(395.8)	(125.0)
Cash dividends paid	(462.5)	(475.0)	(223.1)
Other financing activities	(6.7)	(21.3)	(9.9)
Cash Flows from (used in) Financing Activities	(805.8)	(1,538.4)	(131.6)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(137.1)	156.8	0.3
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	160.3	3.5	3.2
End of period	23.2	160.3	3.5
Evergy Metro
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	255.2	162.9	179.8
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	318.4	281.3	266.3
Amortization of nuclear fuel	25.9	26.2	32.1
Amortization of deferred refueling outage	12.8	13.5	18.3
Net deferred income taxes and credits	(30.6)	48.6	82.5
Allowance for equity funds used during construction	(2.2)	(1.4)	(6.0)
Payments for asset retirement obligations	(2.5)	(13.1)	(25.5)
Other	0.3	3.9	7.5
Changes in working capital items:
Accounts receivable from subsidiaries	37.0	36.5	13.8
Accounts receivable pledged as collateral	12.0	0.0	(20.0)
Fuel inventory and supplies	14.6	19.4	(5.2)
Prepaid expenses and other current assets	28.0	7.2	8.4
Accounts payable	9.1	(34.6)	11.7
Accrued taxes	(9.6)	16.1	9.1
Other current liabilities	(53.2)	10.4	(0.1)
Changes in other assets	33.7	42.9	31.7
Changes in other liabilities	(34.7)	37.9	6.5
Cash Flows from Operating Activities	614.2	657.7	610.9
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(445.0)	(430.7)	(468.6)
Purchase of securities - trusts	(34.0)	(35.1)	(33.6)
Sale of securities - trusts	25.7	27.1	30.3
Other investing activities	9.0	4.8	0.9
Cash Flows from (used in) Investing Activities	(444.3)	(433.9)	(471.0)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net	22.4	8.0	34.6
Collateralized short-term debt, net	(12.0)	0.0	20.0
Proceeds from long-term debt	393.2	465.6	296.2
Retirements of long-term debt	(400.0)	(519.9)	(281.0)
Cash dividends paid	(175.0)	(180.0)	(212.0)
Other financing activities	0.9	2.9	0.0
Cash Flows from (used in) Financing Activities	(170.5)	(223.4)	(142.2)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(0.6)	0.4	(2.3)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	2.6	2.2	4.5
End of period	$ 2.0	$ 2.6	$ 2.2

Consolidated Statements of Changes in Equity - Evergy Metro, Inc - USD ($) $ in Millions	Total	Common Stock	Retained earnings	Evergy Metro Inc	Evergy Metro Inc Common Stock	Evergy Metro Inc Retained earnings	Evergy Metro Inc AOCI - Net gains (losses) on cash flow hedges
Beginning balance (in shares) at Dec. 31, 2016		141,791,153			1
Beginning balance at Dec. 31, 2016	$ 3,833.2	$ 2,727.3	$ 1,078.6	$ 2,541.5	$ 1,563.1	$ 982.6	$ (4.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	336.5		323.9	179.8		179.8
Dividends declared on common stock	(229.2)		(229.2)	(212.0)		(212.0)
Derivative hedging activity, net of tax				4.6			4.6
Ending balance (in shares) at Dec. 31, 2017		142,094,275			1
Ending balance at Dec. 31, 2017	3,860.4	$ 2,734.8	1,173.3	2,513.2	$ 1,563.1	949.7	0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	546.0		535.8	162.9		162.9
Dividends declared on common stock	(362.1)		(362.1)	(180.0)		(180.0)
Derivative hedging activity, net of tax	(4.0)			3.7			3.7
Ending balance (in shares) at Dec. 31, 2018		255,326,252			1
Ending balance at Dec. 31, 2018	9,990.7	$ 8,685.2	1,346.0	2,499.8	$ 1,563.1	932.6	4.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	685.6		669.9	255.2		255.2
Dividends declared on common stock	(462.5)		(462.5)	(175.0)		(175.0)
Derivative hedging activity, net of tax	(46.4)			0.7			0.7
Ending balance (in shares) at Dec. 31, 2019		226,641,443			1
Ending balance at Dec. 31, 2019	$ 8,545.3	$ 7,070.4	$ 1,551.5	$ 2,580.7	$ 1,563.1	$ 1,012.8	$ 4.8

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/exampleRef
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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization

Evergy is a public utility holding company incorporated in 2017 and headquartered in Kansas City, Missouri. Evergy operates primarily through the following wholly-owned direct subsidiaries listed below. In September 2019, these wholly-owned direct subsidiaries were rebranded and renamed under the Evergy brand name.


•	Evergy Kansas Central, Inc. (Evergy Kansas Central), formerly known as Westar Energy, Inc., is an integrated, regulated electric utility that provides electricity to customers in the state of Kansas. Evergy Kansas Central has one active wholly-owned subsidiary with significant operations, Evergy Kansas South, Inc. (Evergy Kansas South), formerly known as Kansas Gas and Electric Company.


•	Evergy Metro, Inc. (Evergy Metro), formerly known as Kansas City Power & Light Company, is an integrated, regulated electric utility that provides electricity to customers in the states of Missouri and Kansas.


•	Evergy Missouri West, Inc. (Evergy Missouri West), formerly known as KCP&L Greater Missouri Operations Company, is an integrated, regulated electric utility that provides electricity to customers in the state of Missouri.

•

Evergy Transmission Company, LLC (Evergy Transmission Company), formerly known as GPE Transmission Holding Company, LLC, owns 13.5% of Transource Energy, LLC (Transource) with the remaining 86.5% owned by AEP Transmission Holding Company, LLC, a subsidiary of American Electric Power Company, Inc. (AEP). Transource is focused on the development of competitive electric transmission projects. Evergy Transmission Company accounts for its investment in Transource under the equity method.

Evergy Kansas Central also owns a 50% interest in Prairie Wind Transmission, LLC (Prairie Wind), which is a joint venture between Evergy Kansas Central and subsidiaries of AEP and Berkshire Hathaway Energy Company. Prairie Wind owns a 108-mile, 345 kV double-circuit transmission line that provides transmission service in the Southwest Power Pool, Inc. (SPP). Evergy Kansas Central accounts for its investment in Prairie Wind under the equity method.

Since the rebranding in September 2019, Evergy Kansas Central, Evergy Kansas South, Evergy Metro and Evergy Missouri West have been conducting business in their respective service territories using the name Evergy. Collectively, the Evergy Companies have approximately 14,700 MWs of owned generating capacity and renewable purchased power agreements and engage in the generation, transmission, distribution and sale of electricity to approximately 1.6 million customers in the states of Kansas and Missouri.

Evergy was incorporated in 2017 as Monarch Energy Holding, Inc. (Monarch Energy), a wholly-owned subsidiary of Great Plains Energy Incorporated (Great Plains Energy). Prior to the closing of the merger transactions, Monarch Energy changed its name to Evergy and did not conduct any business activities other than those required for its

formation and matters contemplated by the Amended and Restated Agreement and Plan of Merger, dated as of July 9, 2017, by and among Great Plains Energy, Evergy Kansas Central, Monarch Energy and King Energy, Inc. (King Energy), a wholly-owned subsidiary of Monarch Energy (Amended Merger Agreement). On June 4, 2018, in accordance with the Amended Merger Agreement, Great Plains Energy merged into Evergy, with Evergy surviving the merger and King Energy merged into Evergy Kansas Central, with Evergy Kansas Central surviving the merger. These merger transactions resulted in Evergy becoming the parent entity of Evergy Kansas Central and the direct subsidiaries of Great Plains Energy, including Evergy Metro and Evergy Missouri West. See Note 2 for additional information regarding the merger.

Principles of Consolidation

Evergy Kansas Central was determined to be the accounting acquirer in the merger and thus, the predecessor of Evergy. Therefore, Evergy's consolidated financial statements reflect the results of operations of Evergy Kansas Central for 2017. Evergy had separate operations for the period beginning with the quarter ended June 30, 2018, and references to amounts for periods after the closing of the merger relate to Evergy. The results of Great Plains Energy's direct subsidiaries have been included in Evergy's results of operations from the date of the closing of the merger and thereafter.

Evergy Metro elected not to apply "push-down accounting" related to the merger, whereby the adjustments of assets and liabilities to fair value and the resulting goodwill would be recorded on the financial statements of the acquired subsidiary. These adjustments for Evergy Metro, as well as those related to the acquired assets and liabilities of Great Plains Energy and its other direct subsidiaries, are only reflected on Evergy's consolidated financial statements.

Each of Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated financial statements includes the accounts of their subsidiaries and variable interest entities (VIEs) of which they are the primary beneficiary. Undivided interests in jointly-owned generation facilities are included on a proportionate basis. Intercompany transactions have been eliminated. The Evergy Companies assess financial performance and allocate resources on a consolidated basis (i.e., operate in one segment).

Use of Estimates

The process of preparing financial statements in conformity with generally accepted accounting principles (GAAP) requires the use of estimates and assumptions that affect the reported amounts of certain types of assets, liabilities, revenues and expenses. Such estimates primarily relate to unsettled transactions and events as of the date of the financial statements. Accordingly, upon settlement, actual results may differ from estimated amounts.

Cash and Cash Equivalents

Cash equivalents consist of highly liquid investments with original maturities of three months or less at acquisition.

Fuel Inventory and Supplies

The Evergy Companies record fuel inventory and supplies at average cost. The following table separately states the balances for fuel inventory and supplies.



	December 31
	2019		2018
Evergy	(millions)
Fuel inventory	$	146.4	$	168.9
Supplies	335.2		342.1
Fuel inventory and supplies	$	481.6	$	511.0
Evergy Kansas Central
Fuel inventory	$	80.2	$	87.8
Supplies	186.2		189.0
Fuel inventory and supplies	$	266.4	$	276.8
Evergy Metro
Fuel inventory	$	46.1	$	57.8
Supplies	116.9		119.8
Fuel inventory and supplies	$	163.0	$	177.6

Property, Plant and Equipment

The Evergy Companies record the value of property, plant and equipment, including that of VIEs, at cost. For plant, cost includes contracted services, direct labor and materials, indirect charges for engineering and supervision and an allowance for funds used during construction (AFUDC). AFUDC represents the allowed cost of capital used to finance utility construction activity. AFUDC equity funds are included as a non-cash item in other income and AFUDC borrowed funds are a reduction of interest expense. AFUDC is computed by applying a composite rate to qualified construction work in progress. The rates used to compute gross AFUDC are compounded semi-annually.

The amounts of the Evergy Companies' AFUDC for borrowed and equity funds are detailed in the following table.



	2019		2018		2017
Evergy	(millions)
AFUDC borrowed funds	$	14.5	$	10.4	$	5.6
AFUDC equity funds	2.2		3.1		2.0
Total	$	16.7	$	13.5	$	7.6
Evergy Kansas Central
AFUDC borrowed funds	$	7.5	$	6.6	$	5.6
AFUDC equity funds	—		2.9		2.0
Total	$	7.5	$	9.5	$	7.6
Evergy Metro^(a)
AFUDC borrowed funds	$	4.3	$	4.9	$	6.1
AFUDC equity funds	2.2		1.4		6.0
Total	$	6.5	$	6.3	$	12.1

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

The average rates used in the calculation of AFUDC are detailed in the following table.



	2019	2018	2017
Evergy Kansas Central	3.0%	3.3%	2.3%
Evergy Metro	4.6%	3.9%	4.9%
Evergy Missouri West	3.7%	2.9%	1.9%

When property units are retired or otherwise disposed, the original cost, net of salvage, is charged to accumulated depreciation. Repair of property and replacement of items not considered to be units of property are expensed as incurred, except for planned refueling and maintenance outages at Wolf Creek Generating Station (Wolf Creek). As authorized by regulators, the incremental maintenance cost incurred for such outages is deferred and amortized to expense ratably over the period between planned outages.

Depreciation and Amortization

Depreciation and amortization of utility plant other than nuclear fuel is computed using the straight-line method over the estimated lives of depreciable property based on rates approved by state regulatory authorities. Annual depreciation rates average approximately 3%. See Note 8 for more details. Nuclear fuel is amortized to fuel expense based on the quantity of heat produced during the generation of electricity.

The depreciable lives of Evergy's, Evergy Kansas Central's and Evergy Metro's property, plant and equipment are detailed in the following table.



	Evergy			Evergy Kansas Central				Evergy Metro
	(years)
Generating facilities	8	to	87		8	to	87	20	to	60
Transmission facilities	15	to	94		36	to	94	15	to	70
Distribution facilities	8	to	73		19	to	73	8	to	55
Other	5	to	84		7	to	84	5	to	50

Plant to be Retired, Net

When the Evergy Companies retire utility plant, the original cost, net of salvage, is charged to accumulated depreciation. However, when it becomes probable an asset will be retired significantly in advance of its original expected useful life and in the near term, the cost of the asset and related accumulated depreciation is recognized as a separate asset and a probable abandonment. If the asset is still in service, the net amount is classified as plant to be retired, net on the consolidated balance sheets. If the asset is no longer in service, the net amount is classified as a regulatory asset on the consolidated balance sheets.

The Evergy Companies must also assess the probability of full recovery of the remaining net book value of the abandonment. The net book value that may be retained as an asset on the balance sheet for the abandonment is dependent upon amounts that may be recovered through regulated rates, including any return. An impairment charge, if any, would equal the difference between the remaining net book value of the asset and the present value of the future revenues expected from the asset.

Evergy Missouri West has determined that its November 2018 retirement of Sibley No. 3 Unit meets the criteria to be considered an abandonment. As of December 31, 2019, Evergy has classified the remaining Sibley No. 3 Unit net book value of $130.5 million as retired generation facilities within regulatory assets on its consolidated balance sheet. This regulatory asset is reduced by approximately $9 million of annual amortization expense which is an amount equal to the annual depreciation expense for the asset reflected in retail rates.

In October 2019, the Missouri Public Service Commission (MPSC) granted the request of certain intervenors for an Accounting Authority Order (AAO) that requires Evergy Missouri West to record a regulatory liability for all revenues collected from customers for return on investment, non-fuel operations and maintenance costs, taxes including accumulated deferred income taxes and all other costs associated with Sibley Station following the station's retirement in November 2018 for consideration in Evergy Missouri West's next rate case, which is expected to be completed no later than 2022. See Note 5 for additional information regarding the AAO.

Evergy Missouri West expects that the MPSC's decision in its next rate case regarding the AAO could impact the valuation of its regulatory asset for retired generation facilities but as of December 31, 2019, has concluded that no impairment is required based on the relevant facts and circumstances.

Nuclear Plant Decommissioning Costs

Nuclear plant decommissioning cost estimates are based on either the immediate dismantlement method or the deferred dismantling method as determined by the State Corporation Commission of the State of Kansas (KCC) and MPSC and include the costs of decontamination, dismantlement and site restoration. Based on these cost estimates, Evergy Kansas Central and Evergy Metro each contribute to a tax-qualified trust fund to be used to decommission Wolf Creek. Related liabilities for decommissioning are included on Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated balance sheets in asset retirement obligations (AROs).

As a result of the authorized regulatory treatment and related regulatory accounting, differences between the decommissioning trust fund asset and the related ARO are recorded as a regulatory asset or liability. See Note 7 for discussion of AROs including those associated with nuclear plant decommissioning costs.

Regulatory Accounting

Accounting standards are applied that recognize the economic effects of rate regulation. Accordingly, regulatory assets and liabilities have been recorded when required by a regulatory order or based on regulatory precedent. See Note 5 for additional information concerning regulatory matters.

Cash Surrender Value of Life Insurance

Amounts related to corporate-owned life insurance (COLI) are recorded on the consolidated balance sheets in other long-terms assets and are detailed in the following table for Evergy. Substantially all of Evergy's COLI-related balances relate to Evergy Kansas Central's COLI activity.



	December 31
	2019			2018
Evergy	(millions)
Cash surrender value of policies	$	1,370.0		$	1,441.7
Borrowings against policies	(1,237.1		)	(1,306.9		)
Corporate-owned life insurance, net	$	132.9		$	134.8

Increases in cash surrender value and death benefits are recorded in other income in the Evergy Companies' consolidated statements of income and comprehensive income. Interest expense incurred on policy loans is offset against the policy income. Income from death benefits is highly variable from period to period.

Fair Value of Financial Instruments

The following methods and assumptions were used to estimate the fair value of the following financial instruments for which it was practicable to estimate that value.

Nuclear decommissioning trust fund - The Evergy Companies' nuclear decommissioning trust fund assets are recorded at fair value based on quoted market prices of the investments held by the fund and/or valuation models.

Pension plans - For financial reporting purposes, the market value of plan assets is the fair value.

Revenue Recognition

The Evergy Companies recognize revenue on the sale of electricity to customers over time as the service is provided in the amount they have the right to invoice. Revenues recorded include electric services provided but not yet billed by the Evergy Companies. Unbilled revenues are recorded for kWh usage in the period following the customers' billing cycle to the end of the month. This estimate is based on net system kWh usage less actual billed kWhs. The Evergy Companies' estimated unbilled kWhs are allocated and priced by regulatory jurisdiction across the rate classes based on actual billing rates. The Evergy Companies' unbilled revenue estimate is affected by factors including fluctuations in energy demand, weather, line losses and changes in the composition of customer classes. See Note 4 for the balance of unbilled receivables for each of Evergy, Evergy Kansas Central and Evergy Metro as of December 31, 2019 and 2018.

See Note 3 for additional details regarding revenue recognition from sales of electricity by the Evergy Companies.

Allowance for Doubtful Accounts

The Evergy Companies determine their allowance for doubtful accounts based on the age of their receivables. Receivables are charged off when they are deemed uncollectible, which is based on a number of factors including specific facts surrounding an account and management's judgment.

Property Gains and Losses

Net gains and losses from the sale of assets and businesses and from asset impairments are recorded in operating expenses.

Asset Impairments

Long-lived assets and finite-lived intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If the sum of the undiscounted expected future cash flows from an asset to be held and used is less than the carrying value of the asset, an asset impairment must be recognized in the financial statements. The amount of impairment recognized is the excess of the carrying value of the asset over its fair value.

Goodwill and indefinite lived intangible assets are tested for impairment annually and when an event occurs indicating the possibility that an impairment exists. The annual test must be performed at the same time each year. The goodwill impairment test consists of comparing the fair value of a reporting unit to its carrying amount, including goodwill, to identify potential impairment. In the event that the carrying amount exceeds the fair value of the reporting unit, an impairment loss is recognized for the difference between the carrying amount of the reporting unit and its fair value. See Note 6 for additional details on goodwill.

Income Taxes

Income taxes are accounted for using the asset/liability approach. Deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and tax bases of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion of the deferred tax assets will not be realized.

The Evergy Companies recognize tax benefits based on a "more-likely-than-not" recognition threshold. In addition, the Evergy Companies recognize interest accrued related to unrecognized tax benefits in interest expense and penalties in operating expenses.

Evergy files a consolidated federal income tax return as well as unitary and combined income tax returns in several state jurisdictions with Kansas and Missouri being the most significant. Income taxes for consolidated or combined subsidiaries are allocated to the subsidiaries based on separate company computations of income or loss. Evergy Kansas Central's and Evergy Metro's income tax provisions include taxes allocated based on their separate company's income or loss.

The Evergy Companies have established a net regulatory liability for future refunds to be made to customers for the over-collection of income taxes in rates. Tax credits are recognized in the year generated except for certain Evergy Kansas Central, Evergy Metro and Evergy Missouri West investment tax credits that have been deferred and amortized over the remaining service lives of the related properties.

Other Income (Expense), Net

The table below shows the detail of other expense for each of the Evergy Companies.



	2019			2018			2017
Evergy	(millions)
Non-service cost component of net benefit cost	$	(55.6	)	$	(47.8	)	$	(20.0	)
Other	(21.3		)	(30.9		)	(19.1		)
Other expense	$	(76.9	)	$	(78.7	)	$	(39.1	)
Evergy Kansas Central
Non-service cost component of net benefit cost	$	(20.1	)	$	(23.5	)	$	(20.0	)
Other	(20.0		)	(23.3		)	(19.1		)
Other expense	$	(40.1	)	$	(46.8	)	$	(39.1	)
Evergy Metro^(a)
Non-service cost component of net benefit cost	$	(20.9	)	$	(25.9	)	$	(42.7	)
Other	(0.5		)	(5.0		)	(8.1		)
Other expense	$	(21.4	)	$	(30.9	)	$	(50.8	)

^(a)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Earnings Per Share

To compute basic earnings per share (EPS), Evergy divides net income attributable to Evergy, Inc. by the weighted average number of common shares outstanding. Diluted EPS includes the effect of issuable common shares resulting from restricted share units (RSUs), performance shares and restricted stock. Evergy computes the dilutive effects of potential issuances of common shares using the treasury stock method.

The following table reconciles Evergy's basic and diluted EPS.



	2019		2018		2017
Income	(millions, except per share amounts)
Net income	$	685.6	$	546.0	$	336.5
Less: Net income attributable to noncontrolling interests	15.7		10.2		12.6
Net income attributable to Evergy, Inc.	$	669.9	$	535.8	$	323.9
Common Shares Outstanding
Weighted average number of common shares outstanding - basic	239.5		213.9		142.5
Add: effect of dilutive securities	0.4		0.2		0.1
Diluted average number of common shares outstanding	239.9		214.1		142.6
Basic EPS	$	2.80	$	2.50	$	2.27
Diluted EPS	$	2.79	$	2.50	$	2.27

Anti-dilutive shares excluded from the computation of diluted EPS for 2019 were 785 RSUs. There were no anti-dilutive securities excluded from the computation of diluted EPS for 2018 and 2017.

Supplemental Cash Flow Information



Year Ended December 31	2019			2018			2017
Evergy	(millions)
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	$	329.5		$	255.9		$	153.9
Interest on financing activities of VIEs	1.6			2.3			3.1
Income taxes, net of refunds	(5.2		)	(0.9		)	(12.7		)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	186.0			(7.8		)	158.8
Deconsolidation of property, plant and equipment of VIE	—			—			(72.9		)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	(0.3		)	0.5			5.1
Deconsolidation of VIE	—			—			(83.1		)



Year Ended December 31	2019		2018			2017
Evergy Kansas Central	(millions)
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	$	143.0	$	155.3		$	153.9
Interest on financing activities of VIEs	1.6		2.3			3.1
Income taxes, net of refunds	29.9		37.5			(12.7		)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	92.1		(32.5		)	158.8
Deconsolidation of property, plant and equipment of VIE	—		—			(72.9		)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	—		—			5.1
Deconsolidation of VIE	—		—			(83.1		)



Year Ended December 31	2019		2018		2017
Evergy Metro^(a)	(millions)
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	$	118.4	$	129.4	$	128.0
Income taxes, net of refunds	77.0		31.2		38.8
Non-cash investing transactions:
Property, plant and equipment additions	80.7		19.2		36.6

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

See Note 2 for the non-cash information related to the merger transaction, including the fair value of Great Plains Energy's assets acquired and liabilities assumed and the issuance of Evergy common stock.

Dividends Declared

In February 2020, Evergy's Board of Directors (Evergy Board) declared a quarterly dividend of $0.505 per share on Evergy's common stock. The common dividend is payable March 20, 2020, to shareholders of record as of March 9, 2020.

In February 2020, Evergy Kansas Central's and Evergy Metro's Boards of Directors each declared cash dividends payable to Evergy of $60.0 million, payable on March 19, 2020.

Recently Adopted Accounting Standards

Leases

In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires an entity that is a lessee to record a right-of-use asset and a lease liability for lease payments on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. Lessor accounting remains largely unchanged. In January 2018, the FASB issued ASU No. 2018-01, Leases: Land Easement Practical Expedient for Transition to Topic 842, which permits entities to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which updates narrow aspects of the guidance issued in ASU No. 2016-02. Also in July 2018, the FASB issued ASU No. 2018-11, Leases: Targeted Improvements, which provides an optional transition method that allows entities to initially apply Topic 842 at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restating prior periods. In December 2018, the FASB issued ASU No. 2018-20, Leases: Narrow-Scope Improvements for Lessors, which is expected to reduce a lessor's implementation and ongoing costs associated with applying ASU No. 2016-02. In March 2019, the FASB issued ASU No. 2019-01, Leases: Codification Improvements, which clarifies certain lessor accounting and interim reporting requirements. ASU No. 2016-02 and the subsequent amendments are effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted, and requires a modified retrospective transition approach with an option to either adjust or not adjust comparative periods.

The Evergy Companies adopted the new guidance on January 1, 2019, without adjusting comparative periods for all leases existing as of January 1, 2019, by electing the optional transition method permitted by ASU No. 2018-11. As a result, Evergy, Evergy Kansas Central and Evergy Metro recorded an increase to assets and liabilities of approximately $110 million, $40 million and $80 million, respectively, as of January 1, 2019. Evergy Kansas Central and Evergy Metro have certain lease transactions between them for which the related assets and liabilities are eliminated at consolidated Evergy. The adoption of Topic 842 did not have a material impact on the Evergy Companies consolidated statements of income and comprehensive income and there was no cumulative-effect adjustment recorded to the opening balance of retained earnings. The Evergy Companies also elected a practical expedient to forgo reassessing existing or expired contracts as leases to determine whether each is in scope of Topic 842 and to forgo reassessing lease classification for existing and expired leases.

Revenue Recognition

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU replaced most existing revenue recognition guidance in GAAP when it became effective. The Evergy Companies adopted ASU No. 2014-09 and its related amendments (Accounting Standards Codification (ASC) 606) on January 1, 2018, using the modified retrospective transition method for all contracts not completed as of the date of adoption. Results for reporting periods beginning after January 1, 2018, are presented under ASC 606 while historical periods have not been adjusted and continue to be reported in accordance with the legacy guidance in ASC 605 - Revenue Recognition. There was no cumulative effect adjustment to the opening balance of retained earnings in 2018 for the Evergy Companies as a result of the adoption of the new guidance.

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL

Description of Merger Transaction

On June 4, 2018, Evergy completed the mergers contemplated by the Amended Merger Agreement. As a result of the mergers, Great Plains Energy merged into Evergy, with Evergy surviving the merger and King Energy merged into Evergy Kansas Central, with Evergy Kansas Central surviving the merger. Following the completion of these mergers, Evergy Kansas Central and the direct subsidiaries of Great Plains Energy, including Evergy Metro and Evergy Missouri West, became wholly-owned subsidiaries of Evergy.

The merger was structured as a merger of equals in a tax-free exchange of shares that involved no premium paid or received with respect to either Great Plains Energy or Evergy Kansas Central. As a result of the closing of the

merger transaction, each outstanding share of Great Plains Energy common stock was converted into 0.5981 shares of Evergy common stock and each outstanding share of Evergy Kansas Central common stock was converted into 1 share of Evergy common stock.

As provided in the Amended Merger Agreement, substantially all of Evergy Kansas Central's outstanding equity compensation awards vested and were converted into a right to receive Evergy common stock and all of Great Plains Energy's outstanding equity compensation awards were converted into equivalent Evergy awards subject to the same terms and conditions at the Great Plains Energy merger exchange ratio of 0.5981.

Merger Related Regulatory Matters

KCC

In May 2018, the KCC approved Great Plains Energy's, Evergy Metro's and Evergy Kansas Central's joint application for approval of the merger, including a settlement agreement that had been reached between Great Plains Energy, Evergy Metro, Evergy Kansas Central, KCC staff and certain other intervenors in the case. Through the joint application and settlement agreement, Great Plains Energy, Evergy Metro and Evergy Kansas Central agreed to the conditions and obligations listed below, in addition to other organizational, financing, customer service and civic responsibility commitments.

•

Provide a total of $30.6 million of one-time bill credits to Kansas electric retail customers as soon as practicable following the close of the merger and the completion of Evergy Kansas Central's and Evergy Metro's current rate cases in Kansas. Of this total, $23.1 million of the credits relate to Evergy Kansas Central's customers and the remaining $7.5 million of credits relate to Evergy Metro's Kansas customers.


•	Provide a total of approximately $46 million in additional bill credits consisting of $11.5 million in annual bill credits to Kansas electric retail customers from 2019 through 2022. Of the annual amount, $8.7 million of the credits relate to Evergy Kansas Central's customers and the remaining $2.8 million of credits relate to Evergy Metro's Kansas customers.


•	Provide for the inclusion of a total of $30.0 million of merger-related savings in Evergy Kansas Central's and Evergy Metro's current rate cases in Kansas. Of this total, $22.5 million of the savings are attributable to Evergy Kansas Central with the remaining $7.5 million of savings attributable to Evergy Metro's Kansas jurisdiction.


•	A five-year base rate moratorium for Evergy Kansas Central and Evergy Metro in Kansas that commenced following the conclusion of Evergy Metro's Kansas rate case in December 2018. The moratorium is subject to certain conditions and does not include Evergy Kansas Central's or Evergy Metro's fuel recovery mechanisms and certain other cost recovery mechanisms in Kansas.


•	Require both Evergy Kansas Central and Evergy Metro to file rate cases in Kansas in a fashion that would allow for updated electric utility rates to become effective upon the end of the five-year rate moratorium in December 2023.


•	Participate in an Earnings Review and Sharing Plan for the years 2019 through 2022, which may result in Evergy Kansas Central and/or Evergy Metro being subject to refunding 50% of earned return on equity in excess of authorized return on equity to their Kansas customers.


•	Maintain charitable contributions and community involvement in the Kansas service territories of Evergy Kansas Central and Evergy Metro at levels equal to or greater than their respective 2015 levels for 5 years following the closing of the merger.


•	Commit that Evergy Kansas Central's and Evergy Metro's retail electric base rates will not increase as a result of the merger.


•	Allow Evergy Kansas Central and Evergy Metro to recover a total of $30.9 million of merger transition costs consisting of $23.2 million for Evergy Kansas Central and $7.7 million for Evergy Metro's Kansas jurisdiction. Evergy Kansas Central and Evergy Metro have recorded these amounts as regulatory assets and they are being recovered over a ten-year period.

MPSC

In May 2018, the MPSC approved Great Plains Energy's, Evergy Metro's, Evergy Missouri West's and Evergy Kansas Central's joint application for approval of the merger, including two stipulations and agreements between these companies, MPSC staff and certain other intervenors in the case. Through the joint application and stipulations and agreements, Great Plains Energy, Evergy Metro, Evergy Missouri West and Evergy Kansas Central agreed to the conditions and obligations listed below, in addition to other organizational, financing, customer service and civic responsibility commitments.


•	Provide a total of $29.1 million of one-time bill credits to Missouri electric retail customers within 120 days following the close of the merger. Of this total, $14.9 million of the credits relate to Evergy Metro's Missouri customers and the remaining $14.2 million of credits relate to Evergy Missouri West's customers.


•	Commit that Evergy Metro's and Evergy Missouri West's retail electric base rates will not increase as a result of the merger.


•	Maintain charitable contributions and community involvement in the Missouri service territories of Evergy Metro and Evergy Missouri West at levels equal to or greater than their respective 2015 levels for 5 years following the closing of the merger.


•	Provide a total of $3.0 million of support over 10 years to community agencies to promote low-income weatherization efforts.


•	Support the recovery of a total of $16.9 million of merger transition costs in Evergy Metro's and Evergy Missouri West's 2018 rate cases, consisting of $9.7 million for Evergy Metro's Missouri jurisdiction and $7.2 million for Evergy Missouri West. Evergy Metro and Evergy Missouri West recorded these amounts as regulatory assets and they are being recovered over a ten-year period.

Accounting Charges and Deferrals Related to the Merger

The following pre-tax reductions of revenue, expenses and deferral were recognized following the consummation of the merger and are included in the Evergy Companies' consolidated statements of income and comprehensive income for 2018.



Description	Income Statement Line Item	Expected Payment Period	Evergy			Evergy Kansas Central			Evergy Metro
			(millions)
One-time bill credits	Operating revenues	2018 - 2019	$	(59.7	)	$	(23.1	)	$	(22.4	)
Annual bill credits	Operating revenues	2019 - 2022	(10.5		)	(7.9		)	(2.6		)
Total impact to operating revenues			$	(70.2	)	$	(31.0	)	$	(25.0	)

Charitable contributions and community support	Operating and maintenance	2018 - 2027	$	24.7		$	—		$	—
Voluntary severance and accelerated equity compensation	Operating and maintenance	2018 - 2019	47.9			44.2			2.6
Other transaction and transition costs	Operating and maintenance	2018	51.0			21.5			2.1
Reallocation and deferral of merger transition costs	Operating and maintenance	n/a	(47.8		)	(13.8		)	(23.2		)
Total impact to operating and maintenance expense			$	75.8		$	51.9		$	(18.5	)
Total			$	(146.0	)	$	(82.9	)	$	(6.5	)

Reductions of revenue related to customer bill credits and expenses related to charitable contributions and community support were incurred as a result of conditions in the MPSC and KCC merger orders and were recorded as liabilities in the amounts presented above following the consummation of the merger. Reductions of revenue for

annual bill credits for Evergy Kansas Central's and Evergy Metro's Kansas electric retail customers are recognized ratably in the twelve-month period preceding their payment.

Voluntary severance and accelerated equity compensation represent costs related to payments for voluntary severance and change in control plans, as well as the recording of unrecognized equity compensation costs and the incremental fair value associated with the vesting of outstanding Evergy Kansas Central equity compensation awards.

Other transaction and transition costs include merger success fees and fees for other outside services incurred.

Reallocation and deferral of merger transition costs represents the net reallocation of incurred merger transition costs between Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West and the subsequent deferral of these transition costs to a regulatory asset for future recovery in accordance with the KCC and MPSC merger orders.

Purchase Price

Based on an evaluation of the provisions of ASC 805, Business Combinations, Evergy Kansas Central was determined to be the accounting acquirer in the merger. Pursuant to the Amended Merger Agreement, Great Plains Energy's common stock shares were exchanged for Evergy common stock shares at the fixed exchange rate of 0.5981. The total consideration transferred in the merger is based on the closing stock price of Evergy Kansas Central on June 4, 2018, and is calculated as follows.



	(millions, except share amounts)
Great Plains Energy common stock shares outstanding as of June 4, 2018	215,800,074
Great Plains Energy restricted stock awards outstanding as of June 4, 2018	(204,825		)
Great Plains Energy shares to be converted to Evergy shares	215,595,249
Exchange ratio	0.5981
Evergy common stock shares issued to Great Plains Energy shareholders	128,947,518
Closing price of Evergy Kansas Central common stock as of June 4, 2018	$	54.00
Fair value of Evergy shares issued to Great Plains Energy shareholders	$	6,963.2
Fair value of Great Plains Energy's equity compensation awards	12.5
Total purchase price	$	6,975.7

Great Plains Energy's equity compensation awards, including performance shares and restricted stock, were replaced by equivalent Evergy equity compensation awards subject to substantially the same terms and conditions upon the closing of the merger. In accordance with the accounting guidance in ASC 805, a portion of the fair value of these awards is attributable to the purchase price as it represents consideration transferred in the merger.

Purchase Price Allocation

The fair value of Great Plains Energy's assets acquired and liabilities assumed as of June 4, 2018, was determined based on significant estimates and assumptions that are judgmental in nature. Third-party valuation specialists were engaged to assist in the valuation of these assets and liabilities.

The significant assets and liabilities recorded at fair values as of the merger date include long-term debt, asset retirement obligations, pension and post-retirement plans, accumulated deferred income tax liabilities and certain other long-term assets and liabilities.

The majority of Great Plains Energy's operations were subject to the rate-setting authority of the MPSC, the KCC and the Federal Energy Regulatory Commission (FERC) and were accounted for pursuant to GAAP, including the accounting guidance for regulated operations. The rate-setting and cost recovery provisions for Great Plains Energy's regulated operations provided revenue derived from costs including a return on investment of assets and liabilities included in rate base. Except for the significant assets and liabilities for which valuation adjustments

were made as discussed above, the fair values of Great Plains Energy's tangible and intangible assets and liabilities subject to these rate-setting provisions approximated their carrying values and the assets and liabilities did not reflect any adjustments to these amounts other than for amounts not included in rate base. The difference between the fair value and pre-merger carrying amounts for Great Plains Energy's long-term debt, asset retirement obligations and pension and post-retirement plans that were related to regulated operations were recorded as a regulatory asset or liability. The excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed were recognized as goodwill as of the merger date.

The final purchase price allocation to Great Plains Energy's assets and liabilities as of June 4, 2018, is detailed in the following table.



	(millions)
Current assets	$	2,151.7
Property, plant and equipment, net	9,179.7
Goodwill	2,336.6
Other long-term assets, excluding goodwill	1,235.9
Total assets	$	14,903.9
Current liabilities	1,673.9
Long-term liabilities, excluding long-term debt	2,895.7
Long-term debt, net	3,358.6
Total liabilities	$	7,928.2
Total purchase price	$	6,975.7

The purchase price allocation in the table above reflects refinements made to the preliminary fair values of long-term liabilities, excluding long-term debt included in the Evergy Companies' combined 2018 annual report on Form 10-K. These refinements include adjustments associated with deferred income taxes that resulted in a decrease to goodwill of $2.3 million.

Impact of Merger

The impact of Great Plains Energy's subsidiaries on Evergy's revenues in the consolidated statement of comprehensive income for 2018 was an increase of $1,661.1 million. The impact of Great Plains Energy's subsidiaries on Evergy's net income attributable to Evergy in the consolidated statement of comprehensive income for 2018 was an increase of $236.2 million.

Evergy has incurred total merger-related costs, including reductions of revenue for customer bill credits, of $148.0 million for 2018 and $11.9 million for 2017.

Pro Forma Financial Information

The following unaudited pro forma financial information reflects the consolidated results of operations of Evergy as if the merger transactions had taken place on January 1, 2017. The unaudited pro forma information was calculated after applying Evergy's accounting policies and adjusting Great Plains Energy's results to reflect purchase accounting adjustments.

The unaudited pro forma financial information has been presented for illustrative purposes only and is not necessarily indicative of the consolidated results of operations that would have been achieved or the future consolidated results of operations of Evergy.



		2018		2017
	(millions, except per share amounts)
Operating revenues		$	5,334.6	$	5,279.2
Net income attributable to Evergy, Inc.		714.3		468.9
Basic earnings per common share		$	2.67	$	1.73
Diluted earnings per common share		$	2.67	$	1.73

Evergy, Evergy Kansas Central and Great Plains Energy incurred non-recurring costs and a gain directly related to the merger that have been excluded in the pro forma earnings presented above. On an after-tax basis, these non-recurring merger-related costs and gain incurred by Evergy, Evergy Kansas Central and Great Plains Energy included:


•	$74.7 million and $14.8 million in 2018 and 2017, respectively, of certain after-tax merger-related transition and transaction costs;


•	$44.4 million in 2018 of after-tax reductions in operating revenues related to one-time customer bill credits;


•	$278.0 million of after-tax financing charges in 2017 related to Great Plains Energy's previously contemplated acquisition of Evergy Kansas Central; and

•

$36.6 million and $7.3 million in 2018 and 2017, respectively, of after-tax mark-to-market gains on interest rate swaps for which cash settlement was contingent upon the consummation of the merger.

REVENUE

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

REVENUE

Evergy's, Evergy Kansas Central's and Evergy Metro's revenues disaggregated by customer class are summarized in the following tables.



Evergy	2019		2018
Revenues	(millions)
Residential	$	1,908.1	$	1,578.8
Commercial	1,781.6		1,356.4
Industrial	621.6		527.8
Other retail	47.1		30.6
Total electric retail	$	4,358.4	$	3,493.6
Wholesale	327.5		404.4
Transmission	309.2		308.1
Industrial steam and other	24.5		17.9
Total revenue from contracts with customers	$	5,019.6	$	4,224.0
Other	128.2		51.9
Operating revenues	$	5,147.8	$	4,275.9



Evergy Kansas Central	2019		2018
Revenues	(millions)
Residential	$	793.9	$	846.4
Commercial	709.1		702.8
Industrial	401.3		396.4
Other retail	21.0		20.0
Total electric retail	$	1,925.3	$	1,965.6
Wholesale	239.9		346.1
Transmission	273.3		288.9
Other	5.8		6.0
Total revenue from contracts with customers	$	2,444.3	$	2,606.6
Other	63.1		8.3
Operating revenues	$	2,507.4	$	2,614.9



Evergy Metro^(a)	2019		2018
Revenues	(millions)
Residential	$	712.4	$	735.6
Commercial	786.1		794.8
Industrial	136.9		138.8
Other retail	16.3		10.4
Total electric retail	$	1,651.7	$	1,679.6
Wholesale	70.9		53.5
Transmission	17.5		14.5
Other	2.8		4.4
Total revenue from contracts with customers	$	1,742.9	$	1,752.0
Other	63.6		71.1
Operating revenues	$	1,806.5	$	1,823.1

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Retail Revenues

The Evergy Companies' retail revenues are generated by the regulated sale of electricity to their residential, commercial and industrial customers within their franchised service territories. The Evergy Companies recognize revenue on the sale of electricity to their customers over time as the service is provided in the amount they have a right to invoice. Retail customers are billed on a monthly basis at the tariff rates approved by the KCC and MPSC based on customer kWh usage.

Revenues recorded include electric services provided but not yet billed by the Evergy Companies. Unbilled revenues are recorded for kWh usage in the period following the customers' billing cycle to the end of the month. This estimate is based on net system kWh usage less actual billed kWhs. The Evergy Companies' estimated unbilled kWhs are allocated and priced by regulatory jurisdiction across the rate classes based on actual billing rates.

The Evergy Companies also collect sales taxes and franchise fees from customers concurrent with revenue-producing activities that are levied by state and local governments. These items are excluded from revenue, and thus not reflected on the statements of income and comprehensive income, for Evergy, Evergy Kansas Central and Evergy Metro. Prior to the adoption of ASC 606 on January 1, 2018, Evergy Metro recorded sales taxes and franchise fees collected from its Missouri customers gross on Evergy Metro's statements of comprehensive income within operating revenues and taxes other than income taxes.

Wholesale Revenues

The Evergy Companies' wholesale revenues are generated by the sale of wholesale power and capacity in circumstances when the power that the Evergy Companies generate is not required for customers in their service territory. These sales primarily occur within the SPP Integrated Marketplace. The Evergy Companies also purchase power from the SPP Integrated Marketplace and record sale and purchase activity on a net basis in wholesale revenue or fuel and purchased power expense. In addition, the Evergy Companies sell wholesale power and capacity through bilateral contracts to other counterparties, such as electric cooperatives, municipalities and other electric utilities.

For both wholesale sales to the SPP Integrated Marketplace and through bilateral contracts, the Evergy Companies recognize revenue on the sale of wholesale electricity to their customers over time as the service is provided in the amount they have a right to invoice.

Wholesale sales within the SPP Integrated Marketplace are billed weekly based on the fixed transaction price determined by the market at the time of the sale and the MWh quantity purchased. Wholesale sales from bilateral contracts are billed monthly based on the contractually determined transaction price and the kWh quantity purchased.

Transmission Revenues

The Evergy Companies' transmission revenues are generated by the use of their transmission networks by the SPP. To enable optimal use of the diverse generating resources in the SPP region, the Evergy Companies, as well as other transmission owners, allow the SPP to access and operate their transmission networks. As new transmission lines are constructed, they are included in the transmission network available to the SPP. In exchange for providing access, the SPP pays the Evergy Companies consideration determined by formula rates approved by FERC, which include the cost to construct and maintain the transmission lines and a return on investment. The price for access to the Evergy Companies' transmission networks are updated annually based on projected costs. Projections are updated to actual costs and the difference is included in subsequent year's prices.

The Evergy Companies have different treatment for their legacy transmission facilities within the SPP, which results in different levels of transmission revenue being received from the SPP. Evergy Kansas Central's transmission revenues from SPP include amounts that Evergy Kansas Central pays to the SPP on behalf of its retail electric customers for the use of Evergy Kansas Central's legacy transmission facilities. These transmission revenues are mostly offset by SPP network transmission cost expense that Evergy Kansas Central pays on behalf of its retail customers. Evergy Metro and Evergy Missouri West do not pay the SPP for their retail customers’ use of the Evergy Metro and Evergy Missouri West legacy transmission facilities and correspondingly, their transmission revenues also do not reflect the associated transmission revenue from the SPP.

The Evergy Companies recognize revenue on the sale of transmission service to their customers over time as the service is provided in the amount they have a right to invoice. Transmission service to the SPP is billed monthly based on a fixed transaction price determined by FERC formula transmission rates along with other SPP-specific charges and the MW quantity purchased.

Industrial Steam and Other Revenues

Evergy's industrial steam and other revenues are primarily generated by the regulated sale of industrial steam to Evergy Missouri West's steam customers. Evergy recognizes revenue on the sale of industrial steam to its customers over time as the service is provided in the amount that it has the right to invoice. Steam customers are billed on a monthly basis at the tariff rate approved by the MPSC based on customer MMBtu usage.

Optional Exemption

Evergy, Evergy Kansas Central and Evergy Metro do not disclose the value of unsatisfied performance obligations on certain bilateral wholesale contracts with an original expected duration of greater than one year for which they recognize revenue in the amount they have the right to invoice.

RECEIVABLES

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

RECEIVABLES

The Evergy Companies' receivables are detailed in the following table.



	December 31
		2019			2018
Evergy		(millions)
Customer accounts receivable - billed		$	7.2		$	16.7
Customer accounts receivable - unbilled		104.0			91.2
Other receivables		127.8			95.0
Allowance for doubtful accounts		(10.5		)	(9.2		)
Total		$	228.5		$	193.7
Evergy Kansas Central
Customer accounts receivable - billed		$	—		$	—
Customer accounts receivable - unbilled		49.7			16.6
Other receivables		94.5			71.6
Allowance for doubtful accounts		(3.8		)	(3.9		)
Total		$	140.4		$	84.3
Evergy Metro
Customer accounts receivable - billed		$	3.1		$	7.8
Customer accounts receivable - unbilled		26.5			42.9
Other receivables		23.1			15.8
Allowance for doubtful accounts		(4.6		)	(3.8		)
Total		$	48.1		$	62.7

Evergy's, Evergy Kansas Central's and Evergy Metro's other receivables at December 31, 2019 and 2018, consisted primarily of receivables from partners in jointly-owned electric utility plants, wholesale sales receivables and certain receivables related to alternative revenue programs. As of December 31, 2019, other receivables for Evergy, Evergy Kansas Central and Evergy Metro included receivables from contracts with customers of $42.0 million, $37.7 million and $1.2 million, respectively. As of December 31, 2018, other receivables for Evergy, Evergy Kansas Central and Evergy Metro included receivables from contracts with customers of $65.8 million, $55.9 million and $5.5 million, respectively.

The Evergy Companies recorded bad debt expense related to contracts with customers as summarized in the following table.



	2019		2018		2017
	(millions)
Evergy	$	27.3	$	20.2	$	10.3
Evergy Kansas Central	7.3		8.5		10.3
Evergy Metro ^(a)	13.7		13.1		7.6

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Sale of Accounts Receivable

Evergy Kansas Central, Evergy Metro and Evergy Missouri West sell an undivided percentage ownership interest in their retail electric accounts receivable to independent outside investors. These sales of the undivided percentage ownership interests in accounts receivable to independent outside investors are accounted for as secured borrowings with accounts receivable pledged as collateral and a corresponding short-term collateralized note payable recognized on the balance sheets. At December 31, 2019 and 2018, Evergy's accounts receivable pledged as collateral and the corresponding short-term collateralized note payable were $339.0 million and $365.0 million, respectively. At December 31, 2019 and 2018, Evergy Kansas Central's accounts receivable pledged as collateral and the corresponding short-term collateralized note payable were $171.0 million and $185.0 million, respectively.

At December 31, 2019 and 2018, Evergy Metro's accounts receivable pledged as collateral and the corresponding short-term collateralized note payable were $118.0 million and $130.0 million, respectively.

Each receivable sale facility expires in September 2020. Evergy Kansas Central's facility allows for $185.0 million in aggregate outstanding principal amount of borrowings from mid-October through mid-June and then $200.0 million from mid-June through the expiration date of the facility. Evergy Metro's facility allows for $130.0 million in aggregate outstanding principal amount of borrowings at any time. Evergy Missouri West's facility allows for $50.0 million in aggregate outstanding principal amount of borrowings from mid-November through mid-June and then $65.0 million from mid-June through the expiration date of the facility.

RATE MATTERS AND REGULATION, AND REGULATORY MATTERS

12 Months Ended

Dec. 31, 2019

Regulated Operations [Abstract]

RATE MATTERS AND REGULATION, AND REGULATORY MATTERS

RATE MATTERS AND REGULATION

KCC Proceedings

Evergy Kansas Central 2019 Transmission Delivery Charge (TDC)

In March 2019, the KCC issued an order adjusting Evergy Kansas Central's retail prices to include updated transmission costs as reflected in the FERC transmission formula rate (TFR). The new prices were effective in April 2019 and are expected to decrease Evergy Kansas Central's annual retail revenues by $7.7 million.

Evergy Metro 2019 TDC

In April 2019, the KCC issued an order adjusting Evergy Metro's retail prices to include updated transmission costs as reflected in the FERC TFR. The new prices were effective in May 2019 and are expected to decrease Evergy Metro's annual retail revenues by $8.3 million.

Evergy Kansas Central Fuel Recovery Mechanism Recovery of 8% of Jeffrey Energy Center (JEC)

As part of the non-unanimous stipulation and agreement approved by the KCC in September 2018 in Evergy Kansas Central's 2018 rate case, it was agreed that in the event that Evergy Kansas Central purchased the 8% ownership interest in JEC that it had historically leased from a trust it would be entitled to file a request with the KCC to recover operating and maintenance and capital costs associated with the 8% ownership through its fuel recovery mechanism as these amounts were not reflected in Evergy Kansas Central's rates established as part of the 2018 rate case.

In the first quarter of 2019, Evergy Kansas Central entered into an agreement with the trust to extend its lease of the 8% interest in JEC from the previous expiration date of January 2019 to August 2019 and to then purchase the 8% ownership interest from the trust at the time the lease expired. Pursuant to the agreement, Evergy Kansas Central's purchase of the 8% ownership interest of JEC closed in August 2019.

In March 2019, Evergy Kansas Central filed an application with the KCC to request recovery through its fuel recovery mechanism of deferred lease expense and operating and maintenance expense incurred during the lease extension and future operating and maintenance expense subsequent to the purchase of the 8% ownership interest in JEC. In September 2019, the KCC issued an order finding that the lease extension and subsequent purchase of the 8% ownership interest by Evergy Kansas Central were not prudent and disallowed the recovery from retail customers of all associated capital and operating costs that were incurred during the lease extension and will be incurred in the future. The KCC order also provided that Evergy Kansas Central be allowed to retain any wholesale electricity sales associated with the 8% ownership interest of JEC.

As a result of the KCC order in September 2019, Evergy and Evergy Kansas Central recorded an $8.4 million pre-tax loss to operating and maintenance expense in their consolidated statements of income and comprehensive income in 2019 associated with the write-off of a regulatory asset for the deferred lease expense and other operating expenses.

Evergy Kansas Central and Evergy Metro Earnings Review and Sharing Plan (ERSP)

As part of their merger settlement agreement with the KCC, Evergy Kansas Central and Evergy Metro agreed to participate in an ERSP for the years 2019 through 2022. Under the ERSP, Evergy Kansas Central's and Evergy Metro's Kansas jurisdiction are required to refund to customers 50% of annual earnings in excess of their authorized

return on equity of 9.3% to the extent the excess earnings exceed the amount of Evergy Kansas Central's and Evergy Metro's annual merger bill credits for the year being measured.

As of December 31, 2019, Evergy Kansas Central and Evergy Metro estimate their 2019 annual earnings will not result in a significant refund obligation. Evergy Kansas Central and Evergy Metro expect to file their 2019 earnings calculations with the KCC in March 2020. The final refund obligation, if any, will be decided by the KCC and could vary from the current estimate.

MPSC Proceedings

Evergy Missouri West Other Proceedings

In December 2018, the Office of the Public Counsel (OPC) and the Midwest Energy Consumers Group (MECG) filed a petition with the MPSC requesting an AAO that would require Evergy Missouri West to record a regulatory liability for all revenues collected from customers for return on investment, non-fuel operations and maintenance costs, taxes including accumulated deferred income taxes, and all other costs associated with Sibley Station following the station’s retirement in November 2018.

In October 2019, the MPSC granted OPC's and MECG's request for an AAO and required Evergy Missouri West to record to a regulatory liability the revenues discussed above for consideration in Evergy Missouri West's next rate case, which is expected to be completed no later than 2022. Depending on the MPSC's decision in this next rate case, Evergy Missouri West could be required to refund to customers all or a portion of amounts collected in revenue for Sibley Station since December 2018 or, alternatively, could be required to make no refunds.

As a result of the MPSC order, Evergy has recorded a regulatory liability of $10.2 million as of December 31, 2019 for the estimated amount of revenues that Evergy Missouri West has collected from customers for Sibley Station since December 2018 that Evergy has determined is probable of refund. Evergy expects that it will continue to defer such amounts as collected from customers until new rates become effective in Evergy Missouri West's next rate case.

The accrual for this estimated amount does not include certain revenues collected related to Sibley Station that Evergy has determined to not be probable of refund in the next rate case based on the relevant facts and circumstances. While Evergy has determined these additional revenues to not be probable of refund, the ultimate resolution of this matter in Evergy Missouri West's next rate case is uncertain and could result in an estimated loss of up to approximately $12 million in excess of the amount accrued per year until Evergy Missouri West's new rates become effective. Evergy's regulatory liability for probable refunds as of December 31, 2019 and estimated loss in excess of the amount accrued represent estimates that could change significantly based on ongoing developments including as a result of an appeal of the MPSC order, decisions in other regulatory proceedings that establish precedent applicable to this matter and positions of parties on this issue in a future Evergy Missouri West rate case.

FERC Proceedings

In October of each year, Evergy Kansas Central and Evergy Metro post an updated TFR that includes projected transmission capital expenditures and operating costs for the following year. This rate is the most material and significant component in the retail rate calculation for Evergy Kansas Central's and Evergy Metro's annual request with the KCC to adjust retail prices to include updated transmission costs through the TDC.

Evergy Kansas Central TFR

In the most recent three years, the updated TFR was expected to adjust Evergy Kansas Central's annual transmission revenues by approximately:


•	$6.8 million increase effective in January 2020;


•	$11.2 million decrease effective in January 2019; and


•	$2.3 million increase effective in January 2018.

Evergy Metro TFR

In the most recent three years, the updated TFR was expected to adjust Evergy Metro's annual transmission revenues by approximately:


•	$1.7 million decrease effective in January 2020;


•	$2.8 million decrease effective in January 2019; and

•

$3.7 million increase effective in January 2018.

Regulatory Assets and Liabilities

The Evergy Companies have recorded assets and liabilities on their consolidated balance sheets resulting from the effects of the ratemaking process, which would not otherwise be recorded if they were not regulated. Regulatory assets represent incurred costs that are probable of recovery from future revenues. Regulatory liabilities represent future reductions in revenues or refunds to customers.

Management regularly assesses whether regulatory assets and liabilities are probable of future recovery or refund by considering factors such as decisions by the MPSC, KCC or FERC in Evergy Kansas Central's, Evergy Metro's and Evergy Missouri West's rate case filings; decisions in other regulatory proceedings, including decisions related to other companies that establish precedent on matters applicable to the Evergy Companies; and changes in laws and regulations. If recovery or refund of regulatory assets or liabilities is not approved by regulators or is no longer deemed probable, these regulatory assets or liabilities are recognized in the current period results of operations. The Evergy Companies continued ability to meet the criteria for recording regulatory assets and liabilities may be affected in the future by restructuring and deregulation in the electric industry or changes in accounting rules. In the event that the criteria no longer applied to any or all of the Evergy Companies' operations, the related regulatory assets and liabilities would be written off unless an appropriate regulatory recovery mechanism were provided. Additionally, these factors could result in an impairment on utility plant assets.

The Evergy Companies' regulatory assets and liabilities are detailed in the following tables.



	December 31
	2019									2018
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Regulatory Assets	(millions)
Pension and post-retirement costs	$	795.9		$	359.9		$	330.7		$	808.2		$	343.7		$	361.5
Debt reacquisition costs	105.8			97.3			7.5			113.5			104.1			8.2
Debt fair value adjustment	112.0			—			—			134.5			—			—
Asset retirement obligations fair value adjustment	114.3			—			—			111.4			—			—
Depreciation	55.3			55.3			—			58.0			58.0			—
Cost of removal	129.3			94.4			34.9			102.4			65.7			36.7
Asset retirement obligations	167.1			52.8			79.4			171.9			49.5			91.6
Analog meter unrecovered investment	29.9			29.9			—			35.6			35.6			—
Treasury yield hedges	22.6			22.6			—			23.7			23.7			—
Iatan No. 1 and common facilities	7.1			—			2.8			7.4			—			2.9
Iatan No. 2 construction accounting costs	26.1			—			13.1			26.8			—			13.5
Kansas property tax surcharge	21.7			18.7			3.0			33.1			23.7			9.4
Disallowed plant costs	14.8			14.8			—			15.0			15.0			—
La Cygne environmental costs	13.7			11.2			2.5			14.8			12.2			2.6
Deferred customer programs	18.0			6.2			8.3			19.9			7.0			8.0
Fuel recovery mechanisms	34.7			—			16.6			91.2			7.1			41.7
Solar rebates	39.8			—			9.0			45.2			—			13.9
Transmission delivery charge	—			—			—			0.8			—			0.8
Wolf Creek outage	31.0			15.5			15.5			21.8			10.9			10.9
Pension and other post-retirement benefit non-service costs	31.8			7.4			15.6			13.6			5.2			4.8
Retired generation facilities	130.5			—			—			159.9			—			—
Merger transition costs	42.3			20.3			15.6			47.0			22.6			17.3
Other regulatory assets	28.5			17.4			5.3			6.1			13.5			2.3
Total	1,972.2			823.7			559.8			2,061.8			797.5			626.1
Less: current portion	(231.7		)	(93.3		)	(95.4		)	(303.9		)	(97.1		)	(130.9		)
Total noncurrent regulatory assets	$	1,740.5		$	730.4		$	464.4		$	1,757.9		$	700.4		$	495.2



	December 31
	2019									2018
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Regulatory Liabilities	(millions)
Taxes refundable through future rates	$	1,656.5		$	856.4		$	568.9		$	1,703.6		$	853.2		$	609.2
Deferred regulatory gain from sale leaseback	53.6			53.6			—			59.1			59.1			—
Emission allowances	50.1			—			50.1			54.1			—			54.1
Nuclear decommissioning	267.3			116.5			150.8			188.2			84.5			103.7
Pension and post-retirement costs	59.3			31.5			20.3			53.4			28.3			25.1
Jurisdictional allowance for funds used during construction	28.7			28.7			—			30.3			30.3			—
La Cygne leasehold dismantling costs	29.6			29.6			—			29.5			29.5			—
Cost of removal	49.1			—			—			48.1			—			—
Kansas tax credits	17.0			17.0			—			16.5			16.5			—
Purchase power agreement	7.4			7.4			—			8.8			8.8			—
Merger customer credits	—			—			—			7.5			—			7.5
Fuel recovery mechanisms	34.1			30.2			—			—			—			—
Sibley AAO	10.2			—			—			—			—			—
Refund of tax reform benefits	—			—			—			70.9			7.2			36.3
Other regulatory liabilities	48.7			3.9			13.5			59.0			3.9			11.2
Total	2,311.6			1,174.8			803.6			2,329.0			1,121.3			847.1
Less: current portion	(63.3		)	(42.3		)	(11.4		)	(110.2		)	(19.5		)	(52.8		)
Total noncurrent regulatory liabilities	$	2,248.3		$	1,132.5		$	792.2		$	2,218.8		$	1,101.8		$	794.3

The following summarizes the nature and period of recovery for each of the regulatory assets listed in the table above.

Pension and post-retirement costs: Represents unrecognized gains and losses and prior service costs that will be recognized in future net periodic pension and post-retirement costs, pension settlements amortized over various periods and financial and regulatory accounting method differences that will be eliminated over the life of the pension plans. Of these amounts, $735.4 million, $359.9 million and $312.9 million for Evergy, Evergy Kansas Central and Evergy Metro, respectively, are not included in rate base and are amortized over various periods. Additionally, $288.4 million, ($23.6) million and $131.1 million for Evergy, Evergy Kansas Central and Evergy Metro, respectively, represent differences between pension and post-retirement costs under GAAP and pension and post-retirement costs for ratemaking that will be recovered or refunded in future rates and differences in accumulated unrecognized gains and losses and prior service costs between Evergy and Evergy Metro due to Evergy Metro electing not to apply "push-down accounting" related to the merger.

Debt reacquisition costs: Includes costs incurred to reacquire and refinance debt. These costs are amortized over the term of the new debt or the remaining lives of the old debt issuances if no new debt was issued and are not included in rate base.

Debt fair value adjustment: Represents purchase accounting adjustments recorded to state the carrying value of Evergy Metro and Evergy Missouri West long-term debt at fair value in connection with the merger. Amount is amortized over the life of the related debt and is not included in rate base.

Asset retirement obligations fair value adjustment: Represents purchase accounting adjustments recorded to state the carrying value of Evergy Metro and Evergy Missouri West AROs at fair value in connection with the merger. Amount is amortized over the life of the related plant and is not included in rate base.

Depreciation: Represents the difference between regulatory depreciation expense and depreciation expense recorded for financial reporting purposes. These assets are included in rate base and the difference is amortized over the life of the related plant.

Cost of removal: Represents amounts spent, but not yet collected, to dispose of plant assets. This asset will decrease as removal costs are collected in rates and is included in rate base.

Asset retirement obligations: Represents amounts associated with AROs as discussed further in Note 7. These amounts are recovered over the life of the related plant and are not included in rate base.

Analog meter unrecovered investment: Represents the deferral of unrecovered investment of retired analog meters. Of this amount, $21.6 million is not included in rate base for Evergy and Evergy Kansas Central and is being amortized over a five-year period.

Treasury yield hedges: Represents the effective portion of treasury yield hedge transactions. Amortization of this amount will be included in interest expense over the term of the related debt and is not included in rate base.

Iatan No. 1 and common facilities: Represents depreciation and carrying costs related to Iatan No. 1 and common facilities. These costs are included in rate base and amortized over various periods.

Iatan No. 2 construction accounting costs: Represents the construction accounting costs related to Iatan No. 2. These costs are included in rate base and amortized through 2059.

Kansas property tax surcharge: Represents actual costs incurred for property taxes in excess of amounts collected in revenues. These costs are expected to be recovered over a one-year period and are not included in rate base.

Disallowed plant costs: The KCC originally disallowed certain costs related to the Wolf Creek plant. In 1987, the KCC revised its original conclusion and provided for recovery of an indirect disallowance with no return on investment. This regulatory asset represents the present value of the future expected revenues to be provided to recover these costs, net of the amounts amortized.

La Cygne environmental costs: Represents the deferral of depreciation and amortization expense and associated carrying charges related to the La Cygne Station environmental project. This amount will be amortized over the life of the related asset and is included in rate base.

Deferred customer programs: Represents costs related to various energy efficiency programs that have been accumulated and deferred for future recovery. Of these amounts, $10.2 million for Evergy and $8.3 million for Evergy Metro are not included in rate base and are amortized over various periods.

Fuel recovery mechanisms: Represents the actual cost of fuel consumed in producing electricity and the cost of purchased power in excess of the amounts collected from customers. This difference is expected to be recovered over a one-year period and is not included in rate base.

Solar rebates: Represents costs associated with solar rebates provided to retail electric customers. These amounts are not included in rate base and are amortized over various periods.

Transmission delivery charge: Represents costs associated with the transmission delivery charge. The amounts are not included in rate base and are amortized over a one-year period.

Wolf Creek outage: Represents deferred expenses associated with Wolf Creek's scheduled refueling and maintenance outages. These expenses are amortized during the period between planned outages and are not included in rate base.

Pension and other post-retirement benefit non-service costs: Represents the non-service component of pension and post-retirement net benefit costs that are capitalized as authorized by regulators. The amounts are included in rate base and are recovered over the life of the related asset.

Retired generation facilities: Represents amounts to be recovered for facilities that have been retired and are probable of recovery.

Merger transition costs: Represents recoverable transition costs related to the merger. The amounts are not included in rate base and are recovered from retail customers through 2028.

Other regulatory assets: Includes various regulatory assets that individually are small in relation to the total regulatory asset balance. These amounts have various recovery periods and are not included in rate base.

The following summarizes the nature and period of amortization for each of the regulatory liabilities listed in the table above.

Taxes refundable through future rates: Represents the obligation to return to customers income taxes recovered in earlier periods when corporate income tax rates were higher than current income tax rates. A large portion of this amount is related to depreciation and will be returned to customers over the life of the applicable property.

Deferred regulatory gain from sale leaseback: Represents the gain Evergy Kansas South recorded on the 1987 sale and leaseback of its 50% interest in La Cygne Unit 2. The gain is amortized over the term of the lease.

Emission allowances: Represents deferred gains related to the sale of emission allowances to be returned to customers.

Nuclear decommissioning: Represents the difference between the fair value of the assets held in the nuclear decommissioning trust and the amount recorded for the accumulated accretion and depreciation expense associated with the asset retirement obligation related to Wolf Creek.

Pension and post-retirement costs: Includes pension and post-retirement benefit obligations and expense recognized in setting prices in excess of actual pension and post-retirement expense.

Jurisdictional allowance for funds used during construction: Represents AFUDC that is accrued subsequent to the time the associated construction charges are included in prices and prior to the time the related assets are placed in service. The AFUDC is amortized to depreciation expense over the useful life of the asset that is placed in service.

La Cygne leasehold dismantling costs: Represents amounts collected but not yet spent on the contractual obligation to dismantle a portion of La Cygne Unit 2. The obligation will be discharged as the unit is dismantled.

Cost of removal: Represents amount collected, but not yet spent, to dispose of plant assets. This liability will be discharged as removal costs are incurred.

Kansas tax credits: Represents Kansas tax credits on investment in utility plant. Amounts will be credited to customers subsequent to the realization of the credits over the remaining lives of the utility plant giving rise to the tax credits.

Purchase power agreement: Represents the amount included in retail electric rates from customers in excess of costs incurred under purchase power agreements. Amounts are amortized over a five-year period.

Merger customer credits: Represents one-time merger bill credits to Evergy Metro's Kansas electric retail customers that were provided in the first quarter of 2019.

Fuel recovery mechanisms: Represents the amount collected from customers in excess of the actual cost of fuel consumed in producing electricity and the cost of purchased power. This difference is expected to be refunded over a one-year period and is not included in rate base.

Sibley AAO: Represents the estimated amount of revenues that Evergy Missouri West has collected from customers for Sibley Station that Evergy has determined is probable of refund. These amounts were recorded in connection with an AAO granted by the MPSC in October 2019 and deferred amounts will be considered by the MPSC in Evergy Missouri West's next rate case.

Refund of tax reform benefits: Represents amounts collected from customers in 2018 related to federal income tax in excess of the income tax owed by the Evergy Companies as a result of the lower federal income tax rate enacted by the Tax Cuts and Jobs Act (TCJA) and were refunded to customers in 2019.

Other regulatory liabilities: Includes various regulatory liabilities that individually are relatively small in relation to the total regulatory liability balance. These amounts will be credited over various periods.

GOODWILL	12 Months Ended
GOODWILL	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILL Accounting rules require goodwill to be tested for impairment annually and when an event occurs indicating the possibility that an impairment exists. Evergy's impairment test for the $2,336.6 million of goodwill that was recorded as a result of the Great Plains Energy and Evergy Kansas Central merger was conducted as of May 1, 2019. The goodwill impairment test consists of comparing the fair value of a reporting unit to its carrying amount, including goodwill, to identify potential impairment. In the event that the carrying amount exceeds the fair value of the reporting unit, an impairment loss is recognized for the difference between the carrying amount of the reporting unit and its fair value. Evergy's consolidated operations are considered one reporting unit for assessment of impairment, as management assesses financial performance and allocates resources on a consolidated basis. The determination of fair value of the reporting unit consisted of two valuation techniques: an income approach consisting of a discounted cash flow analysis and a market approach consisting of a determination of reporting unit invested capital using a market multiple derived from the historical earnings before interest, income taxes, depreciation and amortization and market prices of the stock of peer companies. The results of the two techniques were evaluated and weighted to determine a point within the range that management considered representative of fair value for the reporting unit. The fair value of the reporting unit exceeded the carrying amount, including goodwill. As a result, there was no impairment of goodwill.

ASSET RETIREMENT OBLIGATIONS

12 Months Ended

Dec. 31, 2019

Asset Retirement Obligation Disclosure [Abstract]

ASSET RETIREMENT OBLIGATIONS

AROs associated with tangible long-lived assets are legal obligations that exist under enacted laws, statutes and written or oral contracts, including obligations arising under the doctrine of promissory estoppel. These liabilities are recognized at estimated fair value as incurred with a corresponding amount capitalized as part of the cost of the related long-lived assets and depreciated over their useful lives. Accretion of the liabilities due to the passage of time is recorded to a regulatory asset and/or liability. Changes in the estimated fair values of the liabilities are recognized when known.

Evergy Kansas Central, Evergy Metro and Evergy Missouri West have AROs related to asbestos abatement and the closure and post-closure care of ponds and landfills containing coal combustion residuals (CCRs). In addition, Evergy Kansas Central and Evergy Metro have AROs related to decommissioning Wolf Creek and the retirement of wind generation facilities.

The following table summarizes the change in the Evergy Companies' AROs.



	Evergy						Evergy Kansas Central						Evergy Metro^(a)
	2019			2018			2019			2018			2019			2018
	(millions)
Beginning balance	$	687.1		$	405.1		$	281.1		$	405.1		$	261.0		$	266.3
Liabilities assumed upon merger with Great Plains Energy	—			412.2			—			—			—			—
Liabilities incurred during the year	—			7.4			—			7.4			—			—
Revision in timing and/or estimates	(22.3		)	(150.1		)	(12.4		)	(138.7		)	(9.9		)	(11.4		)
Settlements	(17.8		)	(22.4		)	(14.8		)	(12.0		)	(2.5		)	(13.1		)
Accretion	27.1			34.9			19.0			19.3			5.0			19.2
Ending balance	$	674.1		$	687.1		$	272.9		$	281.1		$	253.6		$	261.0
Less: current portion	(71.3		)	(49.8		)	(23.3		)	(17.1		)	(36.1		)	(29.2		)
Total noncurrent asset retirement obligation	$	602.8		$	637.3		$	249.6		$	264.0		$	217.5		$	231.8

^(a)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

See Note 2 for more information regarding Evergy Metro's and Evergy Missouri West's ARO liabilities that Evergy assumed as a result of the merger.

In 2018, Evergy and Evergy Kansas Central recorded a $127.0 million revision in estimate primarily related to Evergy Kansas Central's ARO to decommission its 47% indirect ownership share of Wolf Creek.

PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

The following tables summarize the property, plant and equipment of Evergy, Evergy Kansas Central and Evergy Metro.



December 31, 2019	Evergy				Evergy Kansas Central				Evergy Metro
		(millions)
Electric plant in service		$	27,768.8			$	13,538.1			$	10,776.5
Electric plant acquisition adjustment		740.6				740.6				—
Accumulated depreciation		(10,293.7		)		(4,951.5		)		(4,272.0		)
Plant in service		18,215.7				9,327.2				6,504.5
Construction work in progress		839.2				472.8				269.9
Nuclear fuel, net		128.5				63.9				64.6
Plant to be retired, net ^(a)		1.0				1.0				—
Net property, plant and equipment		$	19,184.4			$	9,864.9			$	6,839.0

December 31, 2018	Evergy				Evergy Kansas Central				Evergy Metro
		(millions)
Electric plant in service		$	26,916.7			$	13,176.7			$	10,439.1
Electric plant acquisition adjustment		740.6				740.6				—
Accumulated depreciation		(9,694.1		)		(4,642.8		)		(4,022.4		)
Plant in service		17,963.2				9,274.5				6,416.7
Construction work in progress		685.2				376.7				204.4
Nuclear fuel, net		133.1				66.1				67.0
Plant to be retired, net ^(a)		1.0				1.0				—
Net property, plant and equipment		$	18,782.5			$	9,718.3			$	6,688.1

^(a) As of December 31, 2019 and 2018, represents the planned retirement of Evergy Kansas Central analog meters prior to the end of their remaining useful lives.

The following table summarizes the property, plant and equipment of VIEs for Evergy and Evergy Kansas Central.



		December 31
	2019				2018
		(millions)
Electric plant of VIEs		$	392.1			$	392.1
Accumulated depreciation of VIEs		(230.1		)		(222.9		)
Net property, plant and equipment of VIEs		$	162.0			$	169.2

Depreciation Expense

The Evergy Companies' depreciation expense is detailed in the following table.



		2019		2018		2017
	(millions)
Evergy ^(a)		$	786.3	$	567.9	$	350.0
Evergy Kansas Central ^(a)		425.8		371.3		350.0
Evergy Metro^(b)		262.7		235.3		228.4

^(a)Approximately $7.1 million, $7.1 million and $8.3 million of depreciation expense in 2019, 2018 and 2017, respectively, was attributable to property, plant and equipment of VIEs.

^(b)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

JOINTLY-OWNED ELECTRIC UTILITY PLANTS

12 Months Ended

Dec. 31, 2019

Jointly Owned Electric Utility Plants [Abstract]

JOINTLY-OWNED ELECTRIC UTILITY PLANTS

Evergy's, Evergy Kansas Central's and Evergy Metro's share of jointly-owned electric utility plants at December 31, 2019, are detailed in the following tables.



Evergy
	Wolf Creek Unit			La Cygne Units^(a)			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common			Jeffrey Energy Center			State Line
	(millions, except MW amounts)
Evergy's share		94%			100%			88%			73%			79%			100%			40%

Utility plant in service		$	3,827.8		$	2,202.4		$	718.9		$	1,379.7		$	484.3		$	2,428.6		$	114.6
Accumulated depreciation		1,835.3			751.6			269.2			447.2			116.4			918.1			75.9
Nuclear fuel, net		128.6			—			—			—			—			—			—
Construction work in progress		141.4			21.0			54.4			23.5			9.4			38.9			2.8
2020 accredited capacity-MWs		1,104			1,398			616			650			NA			2,186			196


^(a)	The VIE consolidated by Evergy and Evergy Kansas Central holds its 50% leasehold interest in La Cygne Unit 2. This 50% leasehold interest in La Cygne Unit 2 is reflected in the information provided above. See Note 19 for additional information.



Evergy Kansas Central
	Wolf Creek Unit			La Cygne Units^(a)			Jeffrey Energy Center		State Line
	(millions, except MW amounts)
Evergy Kansas Central's share		47%			50%		92%			40%

Utility plant in service		$	1,884.5		$	1,048.0	$	2,223.4		$	114.6
Accumulated depreciation		862.2			426.5		832.5			75.9
Nuclear fuel, net		63.9			—		—			—
Construction work in progress		67.3			14.6		34.9			2.8
2020 accredited capacity-MWs		552			699		2,011			196


^(a)	The VIE consolidated by Evergy and Evergy Kansas Central holds its 50% leasehold interest in La Cygne Unit 2. This 50% leasehold interest in La Cygne Unit 2 is reflected in the information provided above. See Note 19 for additional information.



Evergy Metro
	Wolf Creek Unit			La Cygne Units			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common
	(millions, except MW amounts)
Evergy Metro's share		47%			50%			70%			55%			61%

Utility plant in service		$	1,943.3		$	1,154.4		$	575.1		$	1,060.7		$	390.1
Accumulated depreciation		973.1			325.1			214.9			393.0			99.8
Nuclear fuel, net		64.7			—			—			—			—
Construction work in progress		74.1			6.4			25.9			3.5			1.3
2020 accredited capacity-MWs		552			699			490			491			NA

Each owner must fund its own portion of the plant's operating expenses and capital expenditures. The Evergy Companies' share of direct expenses are included in the appropriate operating expense classifications in Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated financial statements.

PENSION PLANS AND POST-RETIREMENT BENEFITS

12 Months Ended

Dec. 31, 2019

Retirement Benefits [Abstract]

PENSION PLANS AND POST-RETIREMENT BENEFITS

Evergy and certain of its subsidiaries maintain, and Evergy Kansas Central and Evergy Metro participate in, qualified non-contributory defined benefit pension plans covering the majority of Evergy Kansas Central's and Evergy Metro's employees as well as certain non-qualified plans covering certain active and retired officers. Evergy is also responsible for its indirect 94% ownership share of Wolf Creek's defined benefit plans, consisting of Evergy Kansas South's and Evergy Metro's respective 47% ownership shares.

For the majority of employees, pension benefits under these plans reflect the employees' compensation, years of service and age at retirement. However, for the plan covering Evergy Kansas Central's employees, the benefits for non-union employees hired between 2002 and the second quarter of 2018 and union employees hired beginning in 2012 are derived from a cash balance account formula. The plan was closed to future non-union employees in 2018. For the plans covering Evergy Metro's employees, the benefits for union employees hired beginning in 2014 are derived from a cash balance account formula and the plans were closed to future non-union employees in 2014.

Evergy and its subsidiaries also provide certain post-retirement health care and life insurance benefits for substantially all retired employees of Evergy Kansas Central and Evergy Metro and their respective shares of Wolf Creek's post-retirement benefit plans.

The Evergy Companies record pension and post-retirement expense in accordance with rate orders from the KCC and MPSC that allow the difference between pension and post-retirement costs under GAAP and costs for ratemaking to be recognized as a regulatory asset or liability. This difference between financial and regulatory accounting methods is due to timing and will be eliminated over the life of the plans.

For 2019, Evergy and Evergy Metro recorded pension settlement charges of $15.6 million and $23.0 million, respectively, as a result of accelerated pension distributions related to voluntary severance programs. Evergy and Evergy Metro deferred substantially all of the charges to a regulatory asset and expect to recover these amounts over future periods pursuant to regulatory agreements.

The following pension benefits tables provide information relating to the funded status of all defined benefit pension plans on an aggregate basis as well as the components of net periodic benefit costs. For financial reporting purposes, the market value of plan assets is the fair value. Net periodic benefit costs reflect total plan benefit costs prior to the effects of capitalization and sharing with joint owners of power plants. Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2019	$	2,553.4		$	1,258.9		$	1,272.4		$	249.3		$	133.6		$	115.7
Service cost	79.1			29.0			50.1			2.5			1.1			1.4
Interest cost	108.0			53.7			53.3			10.5			5.6			4.9
Contribution by participants	—			—			—			8.8			1.9			6.9
Actuarial loss	262.4			120.3			140.5			20.9			9.5			11.4
Benefits paid	(180.5		)	(136.9		)	(42.3		)	(27.7		)	(13.0		)	(14.7		)
Settlements	(96.6		)	—			(96.6		)	—			—			—
Other	(7.6		)	(1.6		)	(6.0		)	—			—			—
PBO at December 31, 2019	$	2,718.2		$	1,323.4		$	1,371.4		$	264.3		$	138.7		$	125.6
Change in plan assets
Fair value of plan assets at January 1, 2019	$	1,603.4		$	804.6		$	798.8		$	223.3		$	109.7		$	113.6
Actual return on plan assets	284.0			130.5			153.5			30.0			20.0			10.0
Contributions by employer and participants	125.2			43.0			82.2			13.2			3.5			9.7
Benefits paid	(175.6		)	(134.4		)	(41.2		)	(26.6		)	(12.7		)	(13.9		)
Settlements	(96.6		)	—			(96.6		)	—			—			—
Other	(7.6		)	(1.6		)	(6.0		)	—			—			—
Fair value of plan assets at December 31, 2019	$	1,732.8		$	842.1		$	890.7		$	239.9		$	120.5		$	119.4
Funded status at December 31, 2019	$	(985.4	)	$	(481.3	)	$	(480.7	)	$	(24.4	)	$	(18.2	)	$	(6.2	)



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Amounts recognized in the consolidated balance sheets	(millions)
Non-current asset	$	—		$	—		$	—		$	15.0		$	—		$	15.0
Current pension and other post-retirement liability	(5.6		)	(3.0		)	(1.3		)	(1.9		)	(1.0		)	(0.9		)
Noncurrent pension liability and other post-retirement liability	(979.8		)	(478.3		)	(479.4		)	(37.5		)	(17.2		)	(20.3		)
Net amount recognized before regulatory treatment	(985.4		)	(481.3		)	(480.7		)	(24.4		)	(18.2		)	(6.2		)
Accumulated OCI or regulatory asset/liability	454.1			354.9			192.3			(4.4		)	(2.9		)	(13.0		)
Net amount recognized at December 31, 2019	$	(531.3	)	$	(126.4	)	$	(288.4	)	$	(28.8	)	$	(21.1	)	$	(19.2	)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	439.7		$	342.3		$	189.4		$	(5.7	)	$	(4.2	)	$	(4.9	)
Prior service cost	14.4			12.6			2.9			1.3			1.3			(8.1		)
Net amount recognized at December 31, 2019	$	454.1		$	354.9		$	192.3		$	(4.4	)	$	(2.9	)	$	(13.0	)



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2018	$	1,367.0		$	1,367.0		$	1,331.7		$	138.6		$	138.6		$	133.2
Service cost	60.7			32.2			48.6			2.3			1.3			2.0
Interest cost	82.5			50.7			49.9			8.0			5.0			4.8
Contribution by participants	—			—			—			5.6			1.8			6.6
Plan amendments	13.4			11.4			2.0			—			—			—
Actuarial gain	(98.8		)	(100.1		)	(89.6		)	(11.3		)	(2.6		)	(18.0		)
Benefits paid	(137.9		)	(97.9		)	(70.2		)	(17.3		)	(10.5		)	(12.9		)
Obligations assumed upon merger with Great Plains Energy	1,275.9			—			—			123.4			—			—
Other	(9.4		)	(4.4		)	—			—			—			—
PBO at December 31, 2018	$	2,553.4		$	1,258.9		$	1,272.4		$	249.3		$	133.6		$	115.7
Change in plan assets
Fair value of plan assets at January 1, 2018	$	887.0		$	887.0		$	848.4		$	124.1		$	124.1		$	115.8
Actual return on plan assets	(79.7		)	(30.9		)	(60.1		)	(7.5		)	(7.4		)	(1.2		)
Contributions by employer and participants	114.5			47.9			80.3			11.6			3.2			11.4
Benefits paid	(134.0		)	(95.0		)	(69.8		)	(16.7		)	(10.2		)	(12.4		)
Assets acquired upon merger with Great Plains Energy	825.0			—			—			111.8			—			—
Other	(9.4		)	(4.4		)	—			—			—			—
Fair value of plan assets at December 31, 2018	$	1,603.4		$	804.6		$	798.8		$	223.3		$	109.7		$	113.6
Funded status at December 31, 2018	$	(950.0	)	$	(454.3	)	$	(473.6	)	$	(26.0	)	$	(23.9	)	$	(2.1	)



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Amounts recognized in the consolidated balance sheets	(millions)
Non-current asset	$	—		$	—		$	—		$	17.5		$	—		$	17.5
Current pension and other post-retirement liability	(4.4		)	(2.6		)	(0.5		)	(1.7		)	(0.9		)	(0.8		)
Noncurrent pension liability and other post- retirement liability	(945.6		)	(451.7		)	(473.1		)	(41.8		)	(23.0		)	(18.8		)
Net amount recognized before regulatory treatment	(950.0		)	(454.3		)	(473.6		)	(26.0		)	(23.9		)	(2.1		)
Accumulated OCI or regulatory asset/liability	419.9			337.5			230.1			(6.0		)	0.8			(19.1		)
Net amount recognized at December 31, 2018	$	(530.1	)	$	(116.8	)	$	(243.5	)	$	(32.0	)	$	(23.1	)	$	(21.2	)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	403.6		$	323.2		$	226.3		$	(7.8	)	$	(1.0	)	$	(11.0	)
Prior service cost	16.3			14.3			3.8			1.8			1.8			(8.1		)
Net amount recognized at December 31, 2018	$	419.9		$	337.5		$	230.1		$	(6.0	)	$	0.8		$	(19.1	)

As of December 31, 2019 and 2018, Evergy's pension benefits include non-qualified benefit obligations of $49.4 million and $46.9 million, respectively, which are funded by trusts containing assets of $45.5 million and $43.8 million, respectively. As of December 31, 2019 and 2018, Evergy Kansas Central's pension benefits include non-qualified benefit obligations of $26.0 million and $24.8 million, respectively, which are funded by trusts containing assets of $31.7 million and $30.6 million, respectively. The assets in the aforementioned trusts are not included in the table above. See Note 14 for more information on these amounts.



	Pension Benefits									Post-Retirement Benefits
Year Ended December 31, 2019	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	79.1		$	29.0		$	50.1		$	2.5		$	1.1		$	1.4
Interest cost	108.0			53.7			53.3			10.5			5.6			4.9
Expected return on plan assets	(106.3		)	(54.8		)	(48.9		)	(10.0		)	(6.7		)	(3.3		)
Prior service cost	1.9			1.7			0.9			0.5			0.5			—
Recognized net actuarial (gain) loss	33.0			25.5			49.8			(1.2		)	(0.6		)	(1.4		)
Settlement and special termination benefits	15.6			—			23.0			—			—			—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	131.3			55.1			128.2			2.3			(0.1		)	1.6
Regulatory adjustment	37.4			3.0			(19.2		)	(3.4		)	(3.0		)	0.4
Intercompany allocations	n/a			—			(34.4		)	n/a			—			(0.4		)
Net periodic benefit costs	168.7			58.1			74.6			(1.1		)	(3.1		)	1.6
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	84.7			44.6			35.9			0.9			(3.8		)	4.7
Amortization of gain (loss)	(48.6		)	(25.5		)	(72.8		)	1.2			0.6			1.4
Amortization of prior service cost	(1.9		)	(1.7		)	(0.9		)	(0.5		)	(0.5		)	—
Total recognized in OCI or regulatory asset/liability	34.2			17.4			(37.8		)	1.6			(3.7		)	6.1
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	202.9		$	75.5		$	36.8		$	0.5		$	(6.8	)	$	7.7



	Pension Benefits									Post-Retirement Benefits
Year Ended December 31, 2018	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	60.7		$	32.2		$	48.6		$	2.3		$	1.3		$	2.0
Interest cost	82.5			50.7			49.9			8.0			5.0			4.8
Expected return on plan assets	(86.4		)	(55.9		)	(55.5		)	(8.8		)	(7.0		)	(2.8		)
Prior service cost	0.7			0.7			0.7			0.5			0.5			0.1
Recognized net actuarial (gain) loss	32.6			32.6			45.1			(0.6		)	(0.6		)	(0.2		)
Net periodic benefit costs before regulatory adjustment and intercompany allocations	90.1			60.3			88.8			1.4			(0.8		)	3.9
Regulatory adjustment	8.3			8.8			0.7			(1.7		)	(2.0		)	(0.1		)
Intercompany allocations	n/a			—			(21.6		)	n/a			—			(1.1		)
Net periodic benefit costs	98.4			69.1			67.9			(0.3		)	(2.8		)	2.7
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	67.2			(13.2		)	25.9			4.9			11.7			(14.0		)
Amortization of gain (loss)	(32.6		)	(32.6		)	(45.1		)	0.6			0.6			0.2
Prior service cost	13.4			11.4			2.0			—			—			—
Amortization of prior service cost	(0.7		)	(0.7		)	(0.7		)	(0.5		)	(0.5		)	(0.1		)
Total recognized in OCI or regulatory asset/liability	47.3			(35.1		)	(17.9		)	5.0			11.8			(13.9		)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	145.7		$	34.0		$	50.0		$	4.7		$	9.0		$	(11.2	)



	Pension Benefits									Post-Retirement Benefits
Year Ended December 31, 2017	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	28.7		$	28.7		$	44.2		$	1.2		$	1.2		$	2.1
Interest cost	52.4			52.4			52.6			5.5			5.5			5.4
Expected return on plan assets	(53.6		)	(53.6		)	(51.2		)	(6.9		)	(6.9		)	(2.5		)
Prior service cost	0.7			0.7			0.7			0.5			0.5			—
Recognized net actuarial (gain) loss	26.9			26.9			49.0			(0.8		)	(0.8		)	(0.5		)
Settlement and special termination benefits	0.4			0.4			16.3			—			—			—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	55.5			55.5			111.6			(0.5		)	(0.5		)	4.5
Regulatory adjustment	14.5			14.5			(9.2		)	(1.9		)	(1.9		)	1.3
Intercompany allocations	n/a			—			(37.1		)	n/a			—			(1.5		)
Net periodic benefit costs	70.0			70.0			65.3			(2.4		)	(2.4		)	4.3
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	47.1			47.1			71.3			(5.8		)	(5.8		)	3.0
Amortization of gain (loss)	(26.9		)	(26.9		)	(64.9		)	0.8			0.8			0.5
Amortization of prior service cost	(0.7		)	(0.7		)	(0.7		)	(0.5		)	(0.5		)	—
Total recognized in OCI or regulatory asset/liability	19.5			19.5			5.7			(5.5		)	(5.5		)	3.5
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	89.5		$	89.5		$	71.0		$	(7.9	)	$	(7.9	)	$	7.8

For financial reporting purposes, the estimated prior service cost and net actuarial (gain) loss for the defined benefit plans are amortized from accumulated other comprehensive income (OCI) or a regulatory asset into net periodic benefit cost. The Evergy Companies amortize prior service cost on a straight-line basis over the average future service of the active employees (plan participants) benefiting under the plan. Evergy and Evergy Kansas Central amortize the net actuarial (gain) loss on a straight-line basis over the average future service of active plan participants benefiting under the plan without application of an amortization corridor. Evergy Metro amortizes the net actuarial (gain) loss on a rolling five-year average basis. The estimated amounts to be amortized in 2020 are detailed in the following table.



	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
Actuarial (gain) loss amortization	$	45.4	$	33.9	$	45.1	$	0.2	$	—	$	(0.6	)
Prior service cost amortization	1.8		1.6		0.8		0.5		0.5		—

Pension and other post-retirement benefit plans with the PBO, ABO or accumulated other post-retirement benefit obligation (APBO) in excess of the fair value of plan assets at year-end are detailed in the following tables.



December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,390.5	$	1,196.8	$	1,170.2
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,718.2	$	1,323.4	$	1,371.4
Fair value of plan assets	1,732.8		842.1		890.7
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,390.5	$	1,196.8	$	1,170.2
Fair value of plan assets	1,732.8		842.1		890.7
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	264.3	$	138.7	$	125.6
Fair value of plan assets	239.9		120.5		119.4



December 31, 2018	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,257.9	$	1,139.1	$	1,096.7
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,553.4	$	1,258.9	$	1,272.4
Fair value of plan assets	1,603.4		804.6		798.8
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,257.9	$	1,139.1	$	1,096.7
Fair value of plan assets	1,603.4		804.6		798.8
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	249.3	$	133.6	$	57.7
Fair value of plan assets	223.3		109.7		38.2

The expected long-term rate of return on plan assets represents the Evergy Companies' estimate of the long-term return on plan assets and is based on historical and projected rates of return for current and planned asset classes in the plans' investment portfolios. Assumed projected rates of return for each asset class were selected after analyzing historical experience and future expectations of the returns of various asset classes. Based on the target asset allocation for each asset class, the overall expected rate of return for the portfolios was developed and adjusted for the effect of projected benefits paid from plan assets and future plan contributions.

The following tables provide the weighted-average assumptions used to determine benefit obligations and net costs.



Weighted-average assumptions used to determine the benefit obligation at December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.62	%	3.61	%	3.64	%	3.56	%	3.54	%	3.58	%
Rate of compensation increase	3.74	%	3.78	%	3.71	%	3.75	%	n/a		3.75	%

Weighted-average assumptions used to determine the benefit obligation at December 31, 2018	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	4.35	%	4.35	%	4.36	%	4.33	%	4.33	%	4.33	%
Rate of compensation increase	3.76	%	4.03	%	3.64	%	3.50	%	n/a		3.50	%



Weighted-average assumptions used to determine net costs for the year ended December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	4.35	%	4.35	%	4.36	%	4.33	%	4.33	%	4.33	%
Expected long-term return on plan assets	6.61	%	6.75	%	6.47	%	4.44	%	6.00	%	2.94	%
Rate of compensation increase	3.76	%	4.03	%	3.64	%	3.50	%	n/a		3.50	%

Weighted-average assumptions used to determine net costs for the year ended December 31, 2018	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.73	%	3.73	%	3.72	%	3.67	%	3.73	%	3.64	%
Expected long-term return on plan assets	6.52	%	6.67	%	6.46	%	6.00	%	6.00	%	2.80	%
Rate of compensation increase	3.92	%	4.00	%	3.62	%	3.50	%	n/a		3.50	%

Evergy expects to contribute $128.1 million to the pension plans in 2020 to meet Employee Retirement Income Security Act of 1974, as amended (ERISA) funding requirements and regulatory orders, of which $45.5 million is expected to be paid by Evergy Kansas Central and $82.6 million is expected to be paid by Evergy Metro. The Evergy Companies' funding policy is to contribute amounts sufficient to meet the ERISA funding requirements and MPSC and KCC rate orders plus additional amounts as considered appropriate; therefore, actual contributions may differ from expected contributions. Also in 2020, Evergy expects to contribute $3.8 million to the post-retirement benefit plans, of which $0.8 million is expected to be paid by Evergy Kansas Central and $3.0 million is expected to be paid by Evergy Metro.

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid through 2029.



	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2020	$	180.6	$	95.1	$	84.3	$	16.7	$	9.6	$	7.1
2021	182.4		95.6		85.5		16.7		9.5		7.2
2022	181.1		93.3		86.5		16.4		9.3		7.1
2023	181.8		91.5		89.0		16.3		9.2		7.1
2024	185.0		91.9		91.7		15.9		8.8		7.1
2025-2029	918.2		428.3		482.3		75.2		40.3		34.9

Evergy Kansas Central and Evergy Metro each maintain separate trusts for both their qualified pension and post-retirement benefits. These plans are managed in accordance with prudent investor guidelines contained in the ERISA requirements.

The primary objective of the Evergy Kansas Central pension plan is to provide a source of retirement income for its participants and beneficiaries, and the primary financial objective of the plan is to improve its funded status. The primary objective of the Evergy Kansas Central post-retirement benefit plan is growth in assets and the preservation of principal, while minimizing interim volatility, to meet anticipated claims of plan participants.

The primary objective of the Evergy Metro pension plans is to meet or exceed the target rate of return for the plan within a reasonable and prudent level of risk. The primary objective of the Evergy Metro post-retirement benefit plans is to preserve capital, maintain sufficient liquidity and earn a consistent rate of return.

The investment strategies of both the Evergy Kansas Central and Evergy Metro pension and post-retirement plans support the above objectives of the plans. The portfolios are invested, and periodically rebalanced, to achieve the targeted allocations detailed below. The following table provides the target asset allocations by asset class for the Evergy Kansas Central and Evergy Metro pension and other post-retirement plan assets.



	Pension Benefits				Post-Retirement Benefits
	Evergy Kansas Central		Evergy Metro		Evergy Kansas Central		Evergy Metro
Domestic equities	29	%	31	%	33	%	3	%
International equities	20	%	21	%	22	%	—	%
Bonds	36	%	35	%	45	%	85	%
Mortgage & asset backed securities	—	%	—	%	—	%	4	%
Real estate investments	4	%	6	%	—	%	—	%
Other investments	11	%	7	%	—	%	8	%

Fair Value Measurements

Evergy classifies recurring and non-recurring fair value measurements based on the fair value hierarchy as discussed in Note 14. The following are descriptions of the valuation methods of the primary fair value measurements disclosed below.

Domestic equities - consist of individually held domestic equity securities and domestic equity mutual funds. Securities and funds, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as Level 1. Funds that are valued by fund administrators using the net asset value (NAV) per fund

share, derived from the quoted prices in active markets of the underlying securities are not classified within the fair value hierarchy.

International equities - consist of individually held international equity securities and international equity mutual funds. Securities and funds, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as Level 1. Funds that are valued by fund administrators using the NAV per fund share, derived from the quoted prices in active markets of the underlying securities are not classified within the fair value hierarchy.

Bond funds - consist of funds maintained by investment companies that invest in various types of fixed income securities consistent with the funds' stated objectives. Securities and funds, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as Level 1. Funds that are valued by fund administrators using the NAV per fund share, derived from the quoted prices in active markets of the underlying securities, are not classified within the fair value hierarchy.

Corporate bonds - consists of individually held, primarily domestic, corporate bonds that are traded in less than active markets or priced with models using highly observable inputs that are categorized as Level 2.

U.S. Treasury and agency bonds - consists of individually held U.S. Treasury securities and U.S. agency bonds. U.S. Treasury securities, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as a Level 1. U.S. agency bonds, which are publicly quoted, are traded in less than active markets or priced with models using highly observable inputs and are categorized as Level 2.

Mortgage and asset backed securities - consists of individually held securities that are traded in less than active markets or valued with models using highly observable inputs that are categorized as Level 2.

Real estate investments - consists of traded real estate investment trusts valued at the closing price reported on the major market on which the trusts are traded and are categorized as Level 1 and institutional trust funds valued at NAV per fund share and are not categorized in the fair value hierarchy.

Combination debt/equity/other fund - consists of a fund that invests in various types of debt, equity and other asset classes consistent with the fund's stated objectives. The fund, which is publicly quoted, is valued based on quoted prices in active markets and is categorized as Level 1.

Alternative investments - consists of investments in institutional trust and hedge funds that are valued by fund administrators using the NAV per fund share, derived from the underlying investments of the fund, and are not classified within the fair value hierarchy.

Short-term investments - consists of fund investments in high-quality, short-term, U.S. dollar-denominated instruments with an average maturity of 60 days that are valued at NAV per fund share and are not categorized in the fair value hierarchy.

Cash and cash equivalents - consists of investments with original maturities of three months or less when purchased that are traded in active markets and are categorized as Level 1.

The fair values of the Evergy Companies' pension plan assets at December 31, 2019 and 2018, by asset category are in the following tables.



				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	233.8		$	150.6		$	—		$	—		$	83.2
International equities		162.4			101.5			—			—			60.9
Bond funds		281.7			233.0			—			—			48.7
Real estate investments		46.5			—			—			—			46.5
Combination debt/equity/other fund		30.1			30.1			—			—			—
Alternative investment funds		78.5			—			—			—			78.5
Short-term investments		9.1			—			—			—			9.1
Total		$	842.1		$	515.2		$	—		$	—		$	326.9

Evergy Metro Pension Plans
Domestic equities		$	244.8		$	195.3		$	—		$	—		$	49.5
International equities		178.7			117.7			—			—			61.0
Bond funds		71.0			15.6			—			—			55.4
Corporate bonds		123.9			—			123.9			—			—
U.S. Treasury and agency bonds		70.9			53.5			17.4			—			—
Mortgage and asset backed securities		5.7			—			5.7			—			—
Real estate investments		50.8			12.8			—			—			38.0
Combination debt/equity/other fund		11.9			11.9			—			—			—
Alternative investment funds		36.6			—			—			—			36.6
Cash and cash equivalents		92.9			92.9			—			—			—
Short-term investments		1.0			—			—			—			1.0
Other		2.5			—			2.5			—			—
Total		$	890.7		$	499.7		$	149.5		$	—		$	241.5



				Fair Value Measurements Using
Description	December 31 2018			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	215.0		$	144.7		$	—		$	—		$	70.3
International equities		138.7			91.8			—			—			46.9
Bond funds		296.4			255.4			—			—			41.0
Real estate investments		44.8			—			—			—			44.8
Combination debt/equity/other fund		30.1			30.1			—			—			—
Alternative investment funds		73.6			—			—			—			73.6
Short-term investments		6.0			—			—			—			6.0
Total		$	804.6		$	522.0		$	—		$	—		$	282.6

Evergy Metro Pension Plans
Domestic equities		$	238.1		$	198.6		$	—		$	—		$	39.5
International equities		150.9			104.0			—			—			46.9
Bond funds		67.4			19.3			—			—			48.1
Corporate bonds		123.6			—			123.6			—			—
U.S. Treasury and agency bonds		69.9			52.4			17.5			—			—
Mortgage and asset backed securities		5.5			—			5.5			—			—
Real estate investments		48.2			12.6			—			—			35.6
Combination debt/equity/other fund		13.5			13.5			—			—			—
Alternative investment funds		31.6			—			—			—			31.6
Cash and cash equivalents		49.8			49.8			—			—			—
Other		0.3			—			0.3			—			—
Total		$	798.8		$	450.2		$	146.9		$	—		$	201.7

The fair values of the Evergy Companies' post-retirement plan assets at December 31, 2019 and 2018, by asset category are in the following tables.



				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	40.5		$	—		$	—		$	—		$	40.5
International equities		26.0			—			—			—			26.0
Bond funds		52.9			—			—			—			52.9
Cash and cash equivalents		1.1			1.1			—			—			—
Total		$	120.5		$	1.1		$	—		$	—		$	119.4

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	3.2		$	3.2		$	—		$	—		$	—
International equities		1.1			1.1			—			—			—
Bond funds		77.5			0.1			—			—			77.4
Corporate bonds		17.8			—			17.8			—			—
U.S. Treasury and agency bonds		11.5			4.1			7.4			—			—
Mortgage and asset backed securities		1.3			—			1.3			—			—
Cash and cash equivalents		6.7			6.7			—			—			—
Other		0.3			—			0.3			—			—
Total		$	119.4		$	15.2		$	26.8		$	—		$	77.4



				Fair Value Measurements Using
Description	December 31 2018			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	56.4		$	—		$	—		$	—		$	56.4
International equities		14.0			—			—			—			14.0
Bond funds		38.4			—			—			—			38.4
Short-term investments		0.7			—			—			—			0.7
Cash and cash equivalents		0.2			0.2			—			—			—
Total		$	109.7		$	0.2		$	—		$	—		$	109.5

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	2.5		$	2.5		$	—		$	—		$	—
International equities		0.9			0.9			—			—			—
Bond funds		75.0			0.2			—			—			74.8
Corporate bonds		17.4			—			17.4			—			—
U.S. Treasury and agency bonds		10.3			2.6			7.7			—			—
Mortgage and asset backed securities		2.5			—			2.5			—			—
Cash and cash equivalents		4.7			4.7			—			—			—
Other		0.3			—			0.3			—			—
Total		$	113.6		$	10.9		$	27.9		$	—		$	74.8

Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. The cost trend assumptions are detailed in the following tables.



Assumed annual health care cost growth rates as of December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.3	%	6.3	%	6.3	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

Assumed annual health care cost growth rates as of December 31, 2018	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.5	%	6.5	%	6.5	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

The effects of a one-percentage point change in the assumed health care cost trend rates, holding all other assumptions constant, at December 31, 2019, are detailed in the following table.



	Evergy			Evergy Kansas Central^(a)			Evergy Metro
Effect of 1% increase	(millions)
Effect on total service and interest component	$	—		$	—		$	—
Effect on post-retirement benefit obligation	0.5			(0.1		)	0.6
Effect of 1% decrease
Effect on total service and interest component	$	—		$	—		$	—
Effect on post-retirement benefit obligation	(0.4		)	0.1			(0.5		)

^(a)Evergy Kansas Central includes only the effect of health care cost trend rates for Wolf Creek because the Evergy Kansas Central post-retirement benefit plan includes a fixed monthly stipend for health care and therefore is not affected by changes in health care costs.

Employee Savings Plans

Evergy has defined contribution savings plans (401(k)) that cover substantially all employees. Evergy matches employee contributions, subject to limits. The annual costs of the plans are detailed in the following table. Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.



	2019		2018		2017
	(millions)
Evergy	$	17.6	$	16.3	$	9.7
Evergy Kansas Central	9.6		9.9		9.7
Evergy Metro	8.0		8.3		7.7

EQUITY COMPENSATION

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

EQUITY COMPENSATION

Upon the consummation of the merger, Evergy assumed both Evergy Kansas Central's Long-Term Incentive and Share Award plan (LTISA) and Great Plains Energy's Amended Long-Term Incentive Plan, which was renamed the Evergy, Inc. Long-Term Incentive Plan. All outstanding share-based payment awards under Evergy Kansas Central's LTISA vested at the closing of the merger transaction and were converted into a right to receive Evergy common stock with the exception of certain RSUs and deferred director share units issued prior to the closing of the merger to certain directors, officers and employees of Evergy Kansas Central. The vesting of these shares resulted

in the recognition of $14.6 million of compensation expense in Evergy's and Evergy Kansas Central's consolidated statements of income and comprehensive income for 2018.

All of Great Plains Energy's outstanding performance shares, restricted stock, RSUs and director deferred share units under Great Plains Energy's Amended Long-Term Incentive Plan were converted into equivalent Evergy performance shares, restricted stock, RSUs and director deferred share units at Great Plains Energy's merger exchange ratio of 0.5981. The estimated fair value of these converted awards that was allocated to the purchase price was $12.5 million, after-tax. See Note 2 for more information regarding the merger.

The following table summarizes the Evergy Companies' equity compensation expense and the associated income tax benefit.



	2019		2018		2017
Evergy	(millions)
Equity compensation expense	$	15.5	$	30.7	$	8.9
Income tax benefit	3.0		1.4		3.5
Evergy Kansas Central
Equity compensation expense	6.7		24.8		8.9
Income tax benefit	1.9		1.4		3.5
Evergy Metro^(a)
Equity compensation expense	5.7		6.5		4.2
Income tax benefit	0.3		0.1		1.6

^(a)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Restricted Share Units

Evergy has utilized RSUs for new grants of stock-based compensation awards subsequent to the merger. RSU awards are grants that entitle the holder to receive shares of common stock as the awards vest. These RSU awards are defined as nonvested shares and do not include restrictions once the awards have vested. These RSUs either take the form of RSUs with performance measures that vest upon expiration of the award term or RSUs with only service requirements that vest solely upon the passage of time.

RSUs with Performance Measures

The payment of RSUs with performance measures is contingent upon achievement of specific performance goals over a stated period of time as approved by the Compensation and Leadership Development Committee of the Board. The numbers of RSUs with performances measures ultimately paid can vary from the numbers of RSUs with performance measures initially granted depending on Evergy's performance over stated performance periods. Compensation expense for RSUs with performance measures is calculated by recognizing the portion of the fair value for each reporting period for which the requisite service has been rendered. Dividends are accrued over the vesting period and paid in cash based on the number of RSUs with performance measures ultimately paid.

The fair value of RSUs with performance measures is estimated using the market value of Evergy's stock at the valuation date and a Monte Carlo simulation technique that incorporates assumptions for inputs of expected volatilities, dividend yield and risk-free rates. Expected volatility is based on daily stock price change during a historical period commensurate with the remaining term of the performance period of the grant. The risk-free rate is based upon the rate at the time of the evaluation for zero-coupon government bonds with a maturity consistent with the remaining performance period of the grant. The dividend yield is based on the most recent dividends paid and the actual closing stock price on the valuation date. For shares granted in 2019, inputs for expected volatility, dividend yield and risk-free rates were 18%, 3.45% and 2.6%, respectively.

RSU activity for awards with performance measures for 2019 is summarized in the following table.



	Nonvested Restricted Share Units			Grant Date Fair Value*
Beginning balance January 1, 2019		—			$	—
Granted		202,107			37.87
Forfeited		(4,857	)		37.87
Ending balance December 31, 2019		197,250			37.87

* weighted-average

At December 31, 2019, the remaining weighted-average contractual term related to RSU awards with performance measures was 2.2 years. The weighted-average grant-date fair value of RSUs granted with performance measures was $37.87 in 2019. At December 31, 2019, there was $5.4 million of unrecognized compensation expense related to unvested RSUs with performance measures. No RSUs with performance measures vested in 2019.

RSUs with Only Service Requirements

Evergy measures the fair value of RSUs with only service requirements based on the fair market value of the underlying common stock as of the grant date. RSU awards with only service conditions recognize compensation expense by multiplying shares by the grant-date fair value related to the RSU and recognizing it on a straight-line basis over the requisite service period for the entire award, including for those RSUs that have a graded vesting schedule. Nonforfeitable dividend equivalents, or the rights to receive cash equal to the value of dividends paid on Evergy's common stock, are paid on certain of these RSUs during the vesting period. Nonforfeitable dividend equivalents are recorded directly to retained earnings.

RSU activity for awards with only service requirements for 2019 is summarized in the following table.



	Nonvested Restricted Share Units			Grant Date Fair Value*
Beginning balance January 1, 2019		217,256			$	54.07
Granted		70,395			54.47
Vested		(48,767	)		54.20
Forfeited		(5,534	)		54.23
Ending balance December 31, 2019		233,350			54.16

* weighted-average

At December 31, 2019, the remaining weighted-average contractual term related to RSU awards with only service requirements was 1.1 years. The weighted-average grant-date fair value of RSUs granted with only service requirements was $54.47, $52.16 and $53.25 in 2019, 2018 and 2017, respectively. At December 31, 2019, there was $5.2 million of unrecognized compensation expense related to unvested RSUs. The total fair value of RSUs with only service requirements that vested was $2.6 million, $16.0 million and $6.1 million in 2019, 2018 and 2017, respectively.

Performance Shares

Evergy's performance shares represent legacy Great Plains Energy performance shares that converted into equivalent Evergy performance shares at the closing of the merger transaction. The vesting of performance shares is contingent upon achievement of specific performance goals over a stated period of time as approved by the Compensation and Leadership Development Committee of the Evergy Board. The number of performance shares ultimately vested can vary from the number of shares initially granted depending on Evergy's performance over stated performance periods. Compensation expense for performance shares is calculated by recognizing the portion of the grant date fair value for each reporting period for which the requisite service has been rendered. Dividends are accrued over the vesting period and paid in cash based on the number of performance shares ultimately paid.

The fair value of performance share awards was estimated using the market value of Evergy Kansas Central's and Great Plains Energy's common stock at the valuation date upon conversion at the merger and a Monte Carlo simulation technique that incorporates assumptions for inputs of expected volatilities, dividend yield and risk-free rates. Expected volatility was based on daily stock price change based on historical common stock information during a historical period commensurate with the remaining term of the performance period of the grant. The risk-free rate was based upon the rate at the time of the evaluation for zero-coupon government bonds with a maturity consistent with the remaining performance period of the grant. The dividend yield was based on the most recent dividends paid by Evergy Kansas Central, as Evergy's stock price assumed Evergy Kansas Central's stock price on a forward basis, and the grant date stock price on the valuation date.

Performance share activity for 2019 is summarized in the following table. Performance adjustment represents the difference between the number of shares of common stock related to performance shares ultimately issued from the number of performance shares initially granted which can vary depending on Evergy's performance over a stated period of time.



	Performance Shares			Grant Date Fair Value*
Beginning balance January 1, 2019		348,496			$	63.80
Vested		(69,317	)		46.11
Forfeited		(6,481	)		69.65
Performance adjustment		(44,442	)		42.97
Ending balance December 31, 2019		228,256			73.06

* weighted-average

At December 31, 2019, the remaining weighted-average contractual term was 0.5 years. There were no shares granted in 2019. The weighted-average grant-date fair value of shares granted was $63.79 in 2018. At December 31, 2019, there was $2.2 million of total unrecognized compensation expense, net of forfeiture rates, related to performance shares granted under the Evergy, Inc. Long-Term Incentive Plan, which will be recognized over the remaining weighted-average contractual term. The total fair value of performance shares vested was $3.2 million in 2019. There were no vested performance shares in 2018.

Restricted Stock

Evergy's restricted stock represents legacy Great Plains Energy restricted stock that converted into equivalent Evergy restricted stock at the closing of the merger transaction. Restricted stock cannot be sold or otherwise transferred by the recipient prior to vesting and has a value equal to the fair market value of the shares on the issue date. Restricted stock shares vest over a stated period of time with accruing reinvested dividends subject to the same restrictions. Compensation expense, calculated by multiplying shares by the grant-date fair value related to restricted stock, is recognized on a straight-line basis over the requisite service period of the award.

Restricted stock activity for 2019 is summarized in the following table.



	Nonvested Restricted Stock			Grant Date Fair Value*
Beginning balance January 1, 2019		116,675			$	54.03
Vested		(38,404	)		54.35
Forfeited		(2,161	)		53.88
Ending balance December 31, 2019		76,110			53.87

* weighted-average

At December 31, 2019, the remaining weighted-average contractual term was 0.7 years. There were no shares granted in 2019. The weighted-average grant-date fair value of shares granted was $54.05 in 2018. At December 31, 2019, there was $0.8 million of total unrecognized compensation expense, net of forfeiture rates, related to nonvested restricted stock granted under the Evergy, Inc. Long-Term Incentive Plan, which will be

recognized over the remaining weighted-average contractual term. The total fair value of shares vested was $2.1 million and $0.3 million for 2019 and 2018, respectively.

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT

Evergy's $2.5 billion master credit facility expires in 2023. Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West have borrowing capacity under the master credit facility with specific sublimits for each borrower. These sublimits can be unilaterally adjusted by Evergy for each borrower provided the sublimits remain within minimum and maximum sublimits as specified in the facility. A default by any borrower under the facility or one of their significant subsidiaries on other indebtedness totaling more than $100.0 million constitutes a default by that borrower under the facility. Under the terms of this facility, each of Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West is required to maintain a total indebtedness to total capitalization ratio, as defined in the facility, of not greater than 0.65 to 1.00 at all times. As of December 31, 2019, Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West were in compliance with this covenant.

The following table summarizes the committed credit facilities (excluding receivable sale facilities discussed in Note 4) available to the Evergy Companies as of December 31, 2019 and 2018.



			Amounts Drawn
	Credit Facility		Commercial Paper		Letters of Credit		Cash Borrowings		Available Borrowings		Weighted Average Interest Rate on Short-Term Borrowings
December 31, 2019	(millions)
Evergy, Inc.	$	450.0	n/a		$	0.7	$	20.0	$	429.3	2.99%
Evergy Kansas Central	1,000.0		249.2		14.2		—		736.6		2.07%
Evergy Metro	600.0		199.3		—		—		400.7		2.02%
Evergy Missouri West	450.0		93.4		2.1		—		354.5		2.02%
Evergy	$	2,500.0	$	541.9	$	17.0	$	20.0	$	1,921.1

December 31, 2018
Evergy, Inc.	$	450.0	n/a		$	1.0	$	—	$	449.0	—%
Evergy Kansas Central	1,000.0		411.7		18.3		—		570.0		3.08%
Evergy Metro	600.0		176.9		2.7		—		420.4		2.95%
Evergy Missouri West	450.0		150.0		2.1		—		297.9		3.00%
Evergy	$	2,500.0	$	738.6	$	24.1	$	—	$	1,737.3

In March 2019, Evergy entered into a $1.0 billion, 6-month term loan credit agreement with a group of banks to provide short-term financing for its common stock repurchase program. The agreement allowed for two term loans during the 6-month term of the agreement, in an aggregate principal amount not to exceed the credit limit of the agreement. At closing, Evergy borrowed $500.0 million under the agreement, allowing for one additional term loan borrowing in a principal amount up to $500.0 million, which was subsequently utilized in June 2019. In September 2019, Evergy repaid its $1.0 billion of borrowings under the term loan credit agreement with proceeds from its issuance of $1.6 billion of senior notes in September 2019.

LONG-TERM DEBT

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

LONG-TERM DEBT

The Evergy Companies' long-term debt is detailed in the following tables.



December 31, 2019	Issuing Entity	Year Due	Evergy			Evergy Kansas Central			Evergy Metro
Mortgage Bonds			(millions)
5.10% Series	Evergy Kansas Central, Inc.	2020	$	250.0		$	250.0		$	—
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0			250.0			—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0			350.0			—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0			300.0			—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0			550.0			—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0			430.0			—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0			250.0			—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0			300.0			—
3.25% Series	Evergy Kansas Central, Inc.	2049	300.0			300.0
6.15% Series	Evergy Kansas South, Inc.	2023	50.0			50.0			—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0			175.0			—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0			100.0			—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0			250.0			—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5			—			79.5
4.125% Series	Evergy Metro, Inc.	2049	400.0			—			400.0
9.44% Series	Evergy Missouri West, Inc.	2020-2021	2.3			—			—
Pollution Control Bonds
1.39% Series^(b)	Evergy Kansas Central, Inc.	2032	45.0			45.0			—
1.39% Series^(b)	Evergy Kansas Central, Inc.	2032	30.5			30.5			—
1.39% Series^(b)	Evergy Kansas South, Inc.	2027	21.9			21.9			—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0			50.0			—
1.39% Series^(b)	Evergy Kansas South, Inc.	2032	14.5			14.5			—
1.39% Series^(b)	Evergy Kansas South, Inc.	2032	10.0			10.0			—
1.432% Series 2007A and 2007B^(b)	Evergy Metro, Inc.	2035	146.5			—			146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4			—			23.4
Senior Notes
3.15% Series^(g)	Evergy Metro, Inc.	2023	300.0			—			300.0
3.65% Series^(g)	Evergy Metro, Inc.	2025	350.0			—			350.0
6.05% Series (5.78% rate)^(a)(g)	Evergy Metro, Inc.	2035	250.0			—			250.0
5.30% Series^(g)	Evergy Metro, Inc.	2041	400.0			—			400.0
4.20% Series^(g)	Evergy Metro, Inc.	2047	300.0			—			300.0
4.20% Series^(g)	Evergy Metro, Inc.	2048	300.0			—			300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9			—			—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0			—			—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0			—			—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0			—			—
3.74% Series	Evergy Missouri West, Inc.	2022	100.0			—			—
4.85% Series	Evergy, Inc.^(f)	2021	350.0			—			—
5.292% Series	Evergy, Inc.^(f)	2022	287.5			—			—
2.45% Series	Evergy, Inc.	2024	800.0			—			—
2.90% Series (3.77% rate)^(a)	Evergy, Inc.	2029	800.0			—			—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0			—			—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0			—			—
Fair value adjustment^(e)			125.5			—			—
Current maturities			(251.1		)	(250.0		)	—
Unamortized debt discount and debt issuance costs			(80.7		)	(40.8		)	(24.4		)
Total excluding current maturities^(d)			$	8,746.7		$	3,436.1		$	2,525.0



December 31, 2018	Issuing Entity	Year Due	Evergy			Evergy Kansas Central			Evergy Metro
Mortgage Bonds			(millions)
5.10% Series	Evergy Kansas Central, Inc.	2020	$	250.0		$	250.0		$	—
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0			250.0			—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0			350.0			—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0			300.0			—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0			550.0			—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0			430.0			—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0			250.0			—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0			300.0			—
6.70% Series	Evergy Kansas South, Inc.	2019	300.0			300.0			—
6.15% Series	Evergy Kansas South, Inc.	2023	50.0			50.0			—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0			175.0			—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0			100.0			—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0			250.0			—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5			—			79.5
7.15% Series 2009A (8.59% rate)^(a)	Evergy Metro, Inc.	2019	400.0			—			400.0
9.44% Series	Evergy Missouri West, Inc.	2019-2021	3.4			—			—
Pollution Control Bonds
2.46% Series^(b)	Evergy Kansas Central, Inc.	2032	45.0			45.0			—
2.46% Series^(b)	Evergy Kansas Central, Inc.	2032	30.5			30.5			—
2.46% Series^(b)	Evergy Kansas South, Inc.	2027	21.9			21.9			—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0			50.0			—
2.46% Series^(b)	Evergy Kansas South, Inc.	2032	14.5			14.5			—
2.46% Series^(b)	Evergy Kansas South, Inc.	2032	10.0			10.0			—
1.865% Series 2007A and 2007B^(b)	Evergy Metro, Inc.	2035	146.5			—			146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4			—			23.4
Senior Notes
3.15% Series	Evergy Metro, Inc.	2023	300.0			—			300.0
3.65% Series	Evergy Metro, Inc.	2025	350.0			—			350.0
6.05% Series (5.78% rate)^(a)	Evergy Metro, Inc.	2035	250.0			—			250.0
5.30% Series	Evergy Metro, Inc.	2041	400.0			—			400.0
4.20% Series	Evergy Metro, Inc.	2047	300.0			—			300.0
4.20% Series	Evergy Metro, Inc.	2048	300.0			—			300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9			—			—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0			—			—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0			—			—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0			—			—
4.85% Series	Evergy, Inc.^(f)	2021	350.0			—			—
5.292% Series	Evergy, Inc.^(f)	2022	287.5			—			—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0			—			—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0			—			—
Fair value adjustment^(e)			144.8			—			—
Current maturities ^(c)			(705.4		)	(300.0		)	(400.0		)
Unamortized debt discount and debt issuance costs			(57.2		)	(37.1		)	(19.3		)
Total excluding current maturities^(d)			$	6,636.3		$	3,389.8		$	2,130.1


^(a)	Rate after amortizing gains/losses recognized in OCI on settlements of interest rate hedging instruments.


^(b)	Variable rate.


^(c)	Evergy's current maturities total as of December 31, 2018, includes $4.3 million of fair value adjustments recorded in connection with purchase accounting for the merger transaction.


^(d)	At December 31, 2019 and 2018, does not include $50.0 million and $21.9 million of secured Series 2005 Environmental Improvement Revenue Refunding (EIRR) bonds because the bonds were repurchased in September 2015 and are held by Evergy Metro.


^(e)	Represents the fair value adjustments recorded at Evergy consolidated related to the long-term debt of Great Plains Energy, Evergy Metro and Evergy Missouri West in connection with purchase accounting for the merger transaction. This amount is not part of future principal payments and will amortize over the remaining life of the associated debt instruments.


^(f)	Originally issued by Great Plains Energy but assumed by Evergy, Inc. as part of the merger transaction.


^(g)	Effectively secured pursuant to the General Mortgage Indenture and Deed of Trust dated as of December 1, 1986, as supplemented (Evergy Metro Mortgage Indenture) through the issuance of collateral mortgage bonds issued to the trustee for the unsecured senior notes in March 2019.

The following table summarizes Evergy's and Evergy Kansas Central's long-term debt of VIEs.



		December 31
	2019				2018
		(millions)
2.398% due 2021		$	51.1			$	81.4
Current maturities		(32.3		)		(30.3		)
Total excluding current maturities		$	18.8			$	51.1

Mortgage Bonds

The Evergy Kansas Central and Evergy Kansas South mortgages each contain provisions restricting the amount of first mortgage bonds (FMBs) that could be issued by each entity. Evergy Kansas Central and Evergy Kansas South must be in compliance with such restrictions prior to the issuance of additional first mortgage bonds or other secured indebtedness. The amount of Evergy Kansas Central FMBs authorized by its Mortgage and Deed of Trust, dated July 1, 1939, as supplemented, is subject to certain limitations as described below. The amount of Evergy Kansas South FMBs authorized by the Evergy Kansas South Mortgage and Deed of Trust, dated April 1, 1940, as supplemented and amended, is limited to a maximum of $3.5 billion, unless amended further. FMBs are secured by utility assets. Amounts of additional FMBs that may be issued are subject to property, earnings and certain restrictive provisions, except in connection with certain refundings, of each mortgage. As of December 31, 2019, approximately $305.4 million and $2,828.6 million principal amounts of additional Evergy Kansas Central FMBs or Evergy Kansas South FMBs, respectively, could be issued under the most restrictive provisions of their mortgages.

Evergy Metro has issued mortgage bonds under the Evergy Metro Mortgage Indenture, which creates a mortgage lien on substantially all of Evergy Metro's utility plant. Additional Evergy Metro bonds may be issued on the basis of 75% of property additions or retired bonds. As of December 31, 2019, approximately $4,923.3 million principal amount of additional Evergy Metro mortgage bonds could be issued under the most restrictive provisions in the mortgage.

Evergy Missouri West has issued mortgage bonds under the General Mortgage Indenture and Deed of Trust dated April 1, 1946, as supplemented, which creates a mortgage lien on a portion of Evergy Missouri West's utility plant.

In March 2019, Evergy Metro issued collateral mortgage bonds secured by the Evergy Metro Mortgage Indenture to serve as collateral for Evergy Metro's obligations under the following outstanding unsecured senior notes:


•	$300.0 million of 3.15% Series, maturing in 2023;


•	$350.0 million of 3.65% Series, maturing in 2025;


•	$250.0 million of 6.05% Series, maturing in 2035;


•	$400.0 million of 5.30% Series, maturing in 2041;


•	$300.0 million of 4.20% Series, maturing in 2047; and


•	$300.0 million of 4.20% Series, maturing in 2048.

The collateral mortgage bonds were issued to the applicable trustee for the unsecured senior notes, are only payable if Evergy Metro defaults on the underlying unsecured senior notes and do not increase the amount of outstanding debt for Evergy Metro.

As a result of the above transactions, Evergy Metro's outstanding senior notes have effectively become secured by the mortgage lien of the Evergy Metro Mortgage Indenture and rank equally and ratably with all of Evergy Metro's mortgage bonds, regardless of series, from time to time issued and outstanding under the Evergy Metro Mortgage Indenture.

Also in March 2019, Evergy Metro issued, at a discount, $400.0 million of 4.125% Mortgage Bonds, maturing in 2049. Evergy Metro also repaid its $400.0 million of 7.15% Mortgage Bonds at maturity in April 2019.

In June 2019, Evergy Kansas South repaid its $300.0 million of 6.70% FMBs at maturity.

In August 2019, Evergy Kansas Central issued, at a discount, $300.0 million of 3.25% FMBs, maturing in 2049.

Senior Notes

Under the terms of the note purchase agreement for Evergy Missouri West's Series A, B and C Senior Notes, Evergy Missouri West is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the agreement, not greater than 0.65 to 1.00. In addition, Evergy Missouri West's priority debt, as defined in the agreement, cannot exceed 15% of consolidated tangible net worth, as defined in the agreement. At December 31, 2019, Evergy Missouri West was in compliance with these covenants.

In March 2019, Evergy Missouri West issued $100.0 million of 3.74% Senior Notes, maturing in 2022, under a note purchase agreement.

In September 2019, Evergy issued, at a discount, $800.0 million of 2.45% Senior Notes, maturing in 2024 and $800.0 million of 2.90% Senior Notes, maturing in 2029.

Scheduled Maturities

Evergy's, Evergy Kansas Central's and Evergy Metro's long-term debt maturities and the long-term debt maturities of VIEs for the next five years are detailed in the following table.



	2020		2021		2022		2023		2024
	(millions)
Evergy^(a)	$	251.1	$	432.0	$	387.5	$	439.5	$	800.0
Evergy Kansas Central^(a)	250.0		—		—		50.0		—
Evergy Metro	—		—		—		379.5		—
VIEs	32.3		18.8		—		—		—

^(a)Excludes long-term debt maturities of VIEs.

FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

Values of Financial Instruments

GAAP establishes a hierarchical framework for disclosing the transparency of the inputs utilized in measuring assets and liabilities at fair value. Management's assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of assets and liabilities within the fair value hierarchy levels. In addition, the Evergy Companies measure certain investments that do not have a readily determinable fair value at NAV, which are not included in the fair value hierarchy. Further explanation of these levels and NAV is summarized below.

Level 1 – Quoted prices are available in active markets for identical assets or liabilities. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices, such as equities listed on public exchanges.

Level 2 – Pricing inputs are not quoted prices in active markets but are either directly or indirectly observable. The types of assets and liabilities included in Level 2 are certain marketable debt securities, financial instruments traded in less than active markets or other financial instruments priced with models using highly observable inputs.

Level 3 – Significant inputs to pricing have little or no transparency. The types of assets and liabilities included in Level 3 are those with inputs requiring significant management judgment or estimation.

NAV - Investments that do not have a readily determinable fair value are measured at NAV. These investments do not consider the observability of inputs and, therefore, they are not included within the fair value hierarchy. The Evergy Companies include in this category investments in private equity, real estate and alternative investment

funds that do not have a readily determinable fair value. The underlying alternative investments include collateralized debt obligations, mezzanine debt and a variety of other investments.

The Evergy Companies record cash and cash equivalents, accounts receivable and short-term borrowings on their consolidated balance sheets at cost, which approximates fair value due to the short-term nature of these instruments.

Interest Rate Derivatives

The Evergy Companies are exposed to market risks arising from changes in interest rates and may use derivative instruments to manage these risks. From time to time, risk management activities may include entering into interest rate swap agreements to protect against unfavorable interest rate changes relating to forecasted debt transactions. These interest rate swap agreements can be designated as cash flow hedges, in which case gains and losses on the interest rate swaps are deferred in other comprehensive income to be recognized as an adjustment to interest expense over the same period that the hedged interest payments affect earnings. The Evergy Companies classify all cash inflows and outflows for interest rate swap agreements accounted for as cash flow hedges of forecasted debt transactions as financing activities on their consolidated statements of cash flows.

In September 2019, Evergy issued $800.0 million of 2.90% Senior Notes maturing in 2029 and paid $69.8 million to settle an interest rate swap agreement with a notional amount of $500.0 million that was designated as a cash flow hedge of interest payments on the debt issuance. Evergy entered into the interest rate swap agreement in December 2018. The $69.8 million pre-tax loss was recorded in other comprehensive loss on Evergy's consolidated statements of comprehensive income and is being reclassified from accumulated other comprehensive loss to interest expense over the ten-year term of the debt. For 2019, $2.0 million and ($0.5) million were reclassified from accumulated other comprehensive loss to interest expense and income tax expense, respectively, on Evergy's consolidated statements of comprehensive income. As of December 31, 2019, Evergy expects to amortize $5.2 million to earnings from accumulated other comprehensive loss over the next twelve months.

Fair Value of Long-Term Debt

The Evergy Companies measure the fair value of long-term debt using Level 2 measurements available as of the measurement date. The book value and fair value of the Evergy Companies' long-term debt and long-term debt of variable interest entities is summarized in the following table.



	December 31
	2019				2018
	Book Value		Fair Value		Book Value		Fair Value
Long-term debt^(a)	(millions)
Evergy^(b)	$	8,997.8	$	9,750.2	$	7,341.7	$	7,412.1
Evergy Kansas Central	3,686.1		4,078.8		3,689.8		3,771.3
Evergy Metro	2,525.0		2,932.2		2,530.1		2,637.5
Long-term debt of variable interest entities^(a)
Evergy	$	51.1	$	51.5	$	81.4	$	81.3
Evergy Kansas Central	51.1		51.5		81.4		81.3

^(a)Includes current maturities.

^(b)Book value as of December 31, 2019 and 2018, includes $125.5 million and $144.8 million, respectively, of fair value adjustments recorded in connection with purchase accounting for the Great Plains Energy and Evergy Kansas Central merger, which are not part of future principal payments and will amortize over the remaining life of the associated debt instrument.

Recurring Fair Value Measurements

The following tables include the Evergy Companies' balances of financial assets and liabilities measured at fair value on a recurring basis.



Description	December 31, 2019			Level 1		Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust^(a)
Domestic equity funds		$	86.1	$	78.6		$	—		$	—		$	7.5
International equity funds		52.0		52.0			—			—			—
Core bond fund		39.3		39.3			—			—			—
High-yield bond fund		22.3		22.3			—			—			—
Emerging markets bond fund		19.4		19.4			—			—			—
Combination debt/equity/other fund		16.4		16.4			—			—			—
Alternative investments fund		23.9		—			—			—			23.9
Real estate securities fund		12.6		—			—			—			12.6
Cash equivalents		0.5		0.5			—			—			—
Total nuclear decommissioning trust		272.5		228.5			—			—			44.0
Rabbi trust
Core bond fund		25.3		—			—			—			25.3
Combination debt/equity/other fund		6.3		—			—			—			6.3
Cash equivalents		0.1		0.1			—			—			—
Total rabbi trust		31.7		0.1			—			—			31.6
Total		$	304.2	$	228.6		$	—		$	—		$	75.6
Evergy Metro
Assets
Nuclear decommissioning trust^(a)
Equity securities		$	211.1	$	211.1		$	—		$	—		$	—
Debt securities
U.S. Treasury		50.3		50.3			—			—			—
U.S. Agency		0.4		—			0.4			—			—
State and local obligations		2.2		—			2.2			—			—
Corporate bonds		33.2		—			33.2			—			—
Foreign governments		0.1		—			0.1			—			—
Cash equivalents		3.1		3.1			—			—			—
Other		0.3		—			0.3			—			—
Total nuclear decommissioning trust		300.7		264.5			36.2			—			—
Self-insured health plan trust^(b)
Equity securities		0.5		0.5			—			—			—
Debt securities		6.7		1.4			5.3			—			—
Cash and cash equivalents		2.7		2.7			—			—			—
Total self-insured health plan trust		9.9		4.6			5.3			—			—
Total		$	310.6	$	269.1		$	41.5		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.3	$	—		$	—		$	—		$	13.3
Cash and cash equivalents		0.5		0.5			—			—			—
Total rabbi trusts		$	13.8	$	0.5		$	—		$	—		$	13.3
Evergy
Assets
Nuclear decommissioning trust^(a)		$	573.2	$	493.0		$	36.2		$	—		$	44.0
Rabbi trusts		45.5		0.6			—			—			44.9
Self-insured health plan trust^(b)		9.9		4.6			5.3			—			—
Total		$	628.6	$	498.2		$	41.5		$	—		$	88.9



Description	December 31, 2018			Level 1			Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust^(a)
Domestic equity funds		$	70.6		$	63.9		$	—		$	—		$	6.7
International equity funds		36.2			36.2			—			—			—
Core bond fund		37.5			37.5			—			—			—
High-yield bond fund		18.9			18.9			—			—			—
Emerging markets bond fund		15.4			15.4			—			—			—
Combination debt/equity/other fund		12.9			12.9			—			—			—
Alternative investments fund		24.1			—			—			—			24.1
Real estate securities fund		11.8			—			—			—			11.8
Cash equivalents		0.1			0.1			—			—			—
Total nuclear decommissioning trust		227.5			184.9			—			—			42.6
Rabbi trust
Core bond fund		24.8			—			—			—			24.8
Combination debt/equity/other fund		5.6			—			—			—			5.6
Cash equivalents		0.2			0.2			—			—			—
Total rabbi trust		30.6			0.2			—			—			30.4
Total		$	258.1		$	185.1		$	—		$	—		$	73.0
Evergy Metro
Assets
Nuclear decommissioning trust^(a)
Equity securities		$	166.6		$	166.6		$	—		$	—		$	—
Debt securities
U.S. Treasury		42.1			42.1			—			—			—
U.S. Agency		0.4			—			0.4			—			—
State and local obligations		2.1			—			2.1			—			—
Corporate bonds		30.9			—			30.9			—			—
Foreign governments		0.1			—			0.1			—			—
Cash equivalents		1.7			1.7			—			—			—
Other		0.7			0.7			—			—			—
Total nuclear decommissioning trust		244.6			211.1			33.5			—			—
Self-insured health plan trust^(b)
Equity securities		0.5			0.5			—			—			—
Debt securities		3.9			0.3			3.6			—			—
Cash and cash equivalents		8.0			8.0			—			—			—
Total self-insured health plan trust		12.4			8.8			3.6			—			—
Total		$	257.0		$	219.9		$	37.1		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.2		$	—		$	—		$	—		$	13.2
Total rabbi trusts		$	13.2		$	—		$	—		$	—		$	13.2
Liabilities
Interest rate swaps^(c)		$	5.4		$	—		$	5.4		$	—		$	—
Total		$	5.4		$	—		$	5.4		$	—		$	—
Evergy
Assets
Nuclear decommissioning trust^(a)		$	472.1		$	396.0		$	33.5		$	—		$	42.6
Rabbi trust		43.8			0.2			—			—			43.6
Self-insured health plan trust^(b)		12.4			8.8			3.6			—			—
Total		$	528.3		$	405.0		$	37.1		$	—		$	86.2
Liabilities
Interest rate swaps^(c)		$	5.4		$	—		$	5.4		$	—		$	—
Total		$	5.4		$	—		$	5.4		$	—		$	—


^(a)	Fair value is based on quoted market prices of the investments held by the trust and/or valuation models.


^(b)	Fair value is based on quoted market prices of the investments held by the trust. Debt securities classified as Level 1 are comprised of U.S. Treasury securities. Debt securities classified as Level 2 are comprised of corporate bonds, U.S. Agency, state and local obligations, and other asset-backed securities.


^(c)	The fair value of interest rate swaps are determined by calculating the net present value of expected payments and receipts under the interest rate swaps using observable market inputs including interest rates and London Interbank Offered Rate (LIBOR) swap rates.

Certain Evergy and Evergy Kansas Central investments included in the table above are measured at NAV as they do not have readily determinable fair values. In certain situations, these investments may have redemption restrictions.

The following table provides additional information on these Evergy and Evergy Kansas Central investments.



	December 31, 2019				December 31, 2018				December 31, 2019
	Fair		Unfunded		Fair		Unfunded		Redemption	Length of
	Value		Commitments		Value		Commitments		Frequency	Settlement
Evergy Kansas Central	(millions)
Nuclear decommissioning trust:
Domestic equity funds	$	7.5	$	3.3	$	6.7	$	4.3	(a)	(a)
Alternative investments fund^(b)	23.9		—		24.1		—		Quarterly	65 days
Real estate securities fund^(b)	12.6		—		11.8		—		Quarterly	65 days
Total	$	44.0	$	3.3	$	42.6	$	4.3
Rabbi trust:
Core bond fund	$	25.3	$	—	$	24.8	$	—	(c)	(c)
Combination debt/equity/other fund	6.3		—		5.6		—		(c)	(c)
Total	$	31.6	$	—	$	30.4	$	—
Other Evergy
Rabbi trusts:
Fixed income fund	$	13.3	$	—	$	13.2	$	—	(c)	(c)
Total Evergy investments at NAV	$	88.9	$	3.3	$	86.2	$	4.3

^(a)

This investment is in five long-term private equity funds that do not permit early withdrawal. Investments in these funds cannot be distributed until the underlying investments have been liquidated, which may take years from the date of initial liquidation. Three funds have begun to make distributions. The initial investment in the fourth and fifth fund occurred in 2016 and 2018, respectively. The fourth fund's term is 15 years, subject to the general partner's right to extend the term for up to three additional one-year periods. The fifth fund's term will be 15 years after the initial closing date, subject to additional extensions approved by a fund advisory committee to provide for an orderly liquidation of fund investments and dissolution of the fund.


^(b)	There is a holdback on final redemptions.


^(c)	This investment can be redeemed immediately and is not subject to any restrictions on redemptions.

The Evergy Companies hold equity and debt investments classified as securities in various trusts including for the purposes of funding the decommissioning of Wolf Creek and for the benefit of certain retired executive officers of Evergy Kansas Central. The Evergy Companies record net realized and unrealized gains and losses on the nuclear decommissioning trusts in regulatory liabilities on their consolidated balance sheets and record net realized and unrealized gains and losses on the Evergy Companies' rabbi trusts in the consolidated statements of income and comprehensive income.

The following table summarizes the net unrealized gains (losses) for the Evergy Companies' nuclear decommissioning trusts and rabbi trusts.



		2019		2018			2017
Evergy Kansas Central	(millions)
Nuclear decommissioning trust - equity securities		$	33.3	$	(31.8	)	15.7
Rabbi trust - equity securities		3.2		1.0			(14.3		)
Total		$	36.5	$	(30.8	)	$	1.4
Evergy Metro^(a)
Nuclear decommissioning trust - equity securities		$	40.7	$	(20.7	)	26.7
Nuclear decommissioning trust - debt securities		5.1		(2.5		)	0.5
Total		$	45.8	$	(23.2	)	$	27.2
Evergy
Nuclear decommissioning trust - equity securities		$	74.0	$	(54.1	)	15.7
Nuclear decommissioning trust - debt securities		5.1		(0.5		)	—
Rabbi trusts - equity securities		3.1		1.0			(14.3		)
Total		$	82.2	$	(53.6	)	$	1.4

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Environmental Matters

Set forth below are descriptions of contingencies related to environmental matters that may impact the Evergy Companies' operations or their financial results. Management's assessment of these contingencies, which are based on federal and state statutes and regulations, and regulatory agency and judicial interpretations and actions, has evolved over time. These laws and regulations can also change, restrict or otherwise impact the Evergy Companies' operations or financial results in many ways, including the handling or disposal of waste material and the planning for future construction activities. The failure to comply with these laws and regulations could result in the assessment of administrative, civil and criminal penalties and/or the imposition of remedial requirements. The Evergy Companies believe that all of their operations are in substantial compliance with current federal, state and local environmental standards.

There are a variety of final and proposed laws and regulations that could have a material adverse effect on the Evergy Companies' operations and consolidated financial results. Due in part to the complex nature of environmental laws and regulations, the Evergy Companies are unable to assess the impact of potential changes that may develop with respect to the environmental contingencies described below.

Cross-State Air Pollution Update Rule

In September 2016, the Environmental Protection Agency (EPA) finalized the Cross-State Air Pollution (CSAPR) Update Rule. The final rule addresses interstate transport of nitrogen oxides emissions in 22 states including Kansas, Missouri and Oklahoma during the ozone season and the impact from the formation of ozone on downwind states with respect to the 2008 ozone National Ambient Air Quality Standards (NAAQS). In December 2018, the EPA finalized a determination, known as the CSAPR Close-Out Rule, demonstrating the CSAPR Update Rule fully addressed certain upwind states' 2008 ozone NAAQS interstate transport obligations. Various states and others have challenged both the CSAPR Update Rule and the CSAPR Close-Out Rule in the U.S. Court of Appeals for the

D.C. Circuit (D.C. Circuit). In the fourth quarter of 2019, the D.C. Circuit granted these petitions and remanded a portion of the CSAPR Update Rule back to the EPA and vacated the CSAPR Close-Out Rule in its entirety. Due to the uncertainty in what the future CSAPR Update Rule will include, the Evergy Companies cannot determine the impact on their operations or consolidated financial results, but it could be material.

Greenhouse Gases

Burning coal and other fossil fuels releases carbon dioxide (CO₂) and other gases referred to as greenhouse gases (GHG). Various regulations under the federal Clean Air Act Amendments of 1990 (CAA) limit CO₂ and other GHG emissions, and in addition, other measures are being imposed or offered by individual states, municipalities and regional agreements with the goal of reducing GHG emissions.

In August 2018, the EPA published in the Federal Register proposed regulations, which contained (1) emission guidelines for GHG emissions from existing electric utility generating units (EGUs), (2) revisions to emission guideline implementing regulations and (3) revisions to the new source review (NSR) program. These emission guidelines are better known as the Affordable Clean Energy (ACE) Rule. In July 2019, the EPA published in the Federal Register the final ACE Rule with one significant change from the proposal. The NSR program revisions were not included in the final version and are expected to be addressed in a future rulemaking. The ACE Rule establishes emission guidelines for states to use in the development of plans to reduce GHG emissions from existing coal-fired EGUs. This rule defines the "best system of emission reduction" (BSER) for GHG emissions from existing coal-fired EGUs as on-site, heat-rate efficiency improvements. The final rule also provides states with a list of candidate technologies that can be used to establish standards of performance and incorporate these performance standards into state plans. In order for the states to be able to effectively implement the emission guidelines contained in the ACE Rule, the EPA is finalizing new regulations under Section 111(d) of the CAA to help clarify this process. The ACE Rule became effective in September 2019. In conjunction with the finalization of the ACE Rule, the EPA repealed its previously adopted Clean Power Plan (CPP). Also in September 2019, the D.C. Circuit granted motions to dismiss challenges to the CPP and challenges to EPA's denial of reconsideration of the CPP.

Due to uncertainty regarding what future state implementation plans will require for compliance with the ACE Rule as well as legal challenges that have been filed, the Evergy Companies cannot determine the impact on their operations or consolidated financial results, but the cost to comply with the ACE Rule, should it be upheld and implemented in its current or a substantially similar form, could be material.

Water

The Evergy Companies discharge some of the water used in generation and other operations containing substances deemed to be pollutants. A November 2015 EPA rule establishes effluent limitations guidelines (ELG) and standards for wastewater discharges, including limits on the amount of toxic metals and other pollutants that can be discharged. Implementation timelines for this 2015 rule vary from 2018 to 2023. On November 22, 2019, the EPA published a proposed modification to the ELG rule. The proposed rule modifies numeric limits for flue gas desulfurization (FGD) wastewater and adds a 10% volumetric purge limit for bottom ash transport water. The timeline for final FGD wastewater compliance is also delayed by two years to December 31, 2025. The Evergy Companies are in the process of reviewing the proposed rule and the costs to comply with these changes could be material.

In April 2019, the U.S. Court of Appeals for the 5th Circuit (5th Circuit) issued a ruling that vacates and remands portions of the original ELG rule. Due to this ruling, future ELG modifications for the best available technology economically achievable for legacy waste water and leachate are likely.

In October 2014, the EPA's final standards for cooling water intake structures at power plants to protect aquatic life took effect. The standards, based on Section 316(b) of the federal Clean Water Act (CWA), require subject facilities to choose among seven best available technology options to reduce fish impingement. In addition, some facilities must conduct studies to assist permitting authorities to determine whether and what site-specific controls, if any, would be required to reduce entrainment of aquatic organisms. The Evergy Companies' current analysis indicates this rule will not have a significant impact on their coal plants that employ cooling towers or cooling lakes that can

be classified as closed cycle cooling and do not expect the impact from this rule to be material. Plants without closed cycle cooling are under evaluation for compliance with these standards and may require additional controls that could be material.

Evergy Metro holds a permit from the Missouri Department of Natural Resources (MDNR) covering water discharge from its Hawthorn Station. The permit authorizes Evergy Metro to, among other things, withdraw water from the Missouri River for cooling purposes and return the heated water to the Missouri River. Evergy Metro has applied for a renewal of this permit and the EPA has submitted an interim objection letter regarding the allowable amount of heat that can be contained in the returned water. Until this matter is resolved, Evergy Metro continues to operate under its current permit. Evergy and Evergy Metro cannot predict the outcome of this matter; however, while less significant outcomes are possible, this matter may require a reduction in generation, installation of cooling towers or other technology to cool the water, or both, any of which could have a material impact on Evergy's and Evergy Metro's operations and consolidated financial results.

Regulation of Coal Combustion Residuals

In the course of operating their coal generation plants, the Evergy Companies produce CCRs, including fly ash, gypsum and bottom ash. The EPA published a rule to regulate CCRs in April 2015, that requires additional CCR handling, processing and storage equipment and closure of certain ash disposal units.

In March 2019, the D.C. Circuit issued a ruling to grant the EPA's request to remand the Phase I, Part I CCR rule. This was in response to a prior court ruling requiring the EPA to address un-lined surface impoundment closure requirements. On December 2, 2019, the EPA published a proposed rule called the Part A CCR Rule. This proposal reclassifies clay-lined surface impoundments from "lined" to "unlined" and establishes a deadline of August 31, 2020 to initiate closure. The prior rule included a deadline of October 31, 2020 for unlined impoundments to initiate closure. In February 2020, the EPA released a pre-publication version of a proposed rule called the Part B CCR Rule. This proposal includes a process to allow unlined impoundments to continue to operate if a demonstration is made to prove that they are not adversely impacting groundwater, human health or the environment. The proposal also includes clarification regarding ash used in the closure of landfills and surface impoundments. The Evergy Companies are in the process of reviewing these proposed rules and the costs to comply with these changes could be material.

The Evergy Companies have recorded AROs for their current estimates for the closure of ash disposal ponds, but the revision of these AROs may be required in the future due to changes in existing CCR regulations, the results of groundwater monitoring of CCR units or changes in interpretation of existing CCR regulations or changes in the timing or cost to close ash disposal ponds. If revisions to these AROs are necessary, the impact on the Evergy Companies' operations or consolidated financial results could be material.

Storage of Spent Nuclear Fuel

Under the Nuclear Waste Policy Act of 1982, the Department of Energy (DOE) is responsible for the permanent disposal of spent nuclear fuel. In 2010, the DOE filed a motion with the Nuclear Regulatory Commission (NRC) to withdraw its then pending application to construct a national repository for the disposal of spent nuclear fuel and high-level radioactive waste at Yucca Mountain, Nevada. The NRC has not yet issued a final decision on the matter.

Wolf Creek has elected to build a dry cask storage facility to expand its existing on-site spent nuclear fuel storage, which is expected to provide additional capacity prior to 2022. The Evergy Companies expect that the majority of the costs to construct the dry cask storage facility that would not have otherwise been incurred had the DOE begun accepting spent nuclear fuel will be reimbursed by the DOE. The Evergy Companies cannot predict when, or if, an off-site storage site or alternative disposal site will be available to receive Wolf Creek's spent nuclear fuel and will continue to monitor this activity.

Nuclear Insurance

Nuclear liability, property and accidental outage insurance is maintained for Wolf Creek. These policies contain certain industry standard terms, conditions and exclusions, including, but not limited to, ordinary wear and tear and war. An industry aggregate limit of $3.2 billion for nuclear events ($1.8 billion of non-nuclear events) plus any

reinsurance, indemnity or any other source recoverable by Nuclear Electric Insurance Limited (NEIL), provider of property and accidental outage insurance, exists for acts of terrorism affecting Wolf Creek or any other NEIL insured plant within 12 months from the date of the first act. In addition, participation is required in industry-wide retrospect assessment programs as discussed below.

Nuclear Liability Insurance

Pursuant to the Price-Anderson Act, liability insurance includes coverage against public nuclear liability claims resulting from nuclear incidents to the required limit of public liability, which is approximately $13.9 billion. This limit of liability consists of the maximum available commercial insurance of $0.4 billion and the remaining $13.5 billion is provided through mandatory participation in an industry-wide retrospective assessment program. Under this retrospective assessment program, the owners of Wolf Creek are jointly and severally subject to an assessment of up to $137.6 million (Evergy's share is $129.2 million and each of Evergy Kansas Central's and Evergy Metro's is $64.6 million), payable at no more than $20.5 million (Evergy's share is $19.2 million and each of Evergy Kansas Central's and Evergy Metro's is $9.6 million) per incident per year per reactor for any commercial U.S. nuclear reactor qualifying incident. Both the total and yearly assessment is subject to an inflationary adjustment based on the Consumer Price Index and applicable premium taxes. In addition, the U.S. Congress could impose additional revenue-raising measures to pay claims.

Nuclear Property and Accidental Outage Insurance

The owners of Wolf Creek carry decontamination liability, nuclear property damage and premature nuclear decommissioning liability insurance for Wolf Creek totaling approximately $2.8 billion. Insurance coverage for non-nuclear property damage accidents total approximately $2.3 billion. In the event of an extraordinary nuclear accident, insurance proceeds must first be used for reactor stabilization and site decontamination in accordance with a plan mandated by the NRC. The Evergy Companies' share of any remaining proceeds can be used to pay for property damage or, if certain requirements are met, including decommissioning the plant, toward a shortfall in the nuclear decommissioning trust fund. The owners also carry additional insurance with NEIL to help cover costs of replacement power and other extra expenses incurred during a prolonged outage resulting from accidental property damage at Wolf Creek. If significant losses were incurred at any of the nuclear plants insured under the NEIL policies, the owners of Wolf Creek may be subject to retrospective assessments under the current policies of approximately $33.2 million (Evergy's share is $31.2 million and each of Evergy Kansas Central's and Evergy Metro's is $15.6 million).

Nuclear Insurance Considerations

Although the Evergy Companies maintain various insurance policies to provide coverage for potential losses and liabilities resulting from an accident or an extended outage, the insurance coverage may not be adequate to cover the costs that could result from a catastrophic accident or extended outage at Wolf Creek. Any substantial losses not covered by insurance, to the extent not recoverable in prices, would have a material effect on the Evergy Companies' consolidated financial results.

Contractual Commitments - Fuel, Power and Other

The Evergy Companies' contractual commitments at December 31, 2019, excluding pensions, long-term debt and leases, are detailed in the following tables. See Notes 10, 13 and 21 for information regarding pension, long-term debt and lease commitments, respectively.



Evergy
	2020		2021		2022		2023		2024		After 2024			Total
Purchase commitments	(millions)
Fuel	$	486.9	$	137.0	$	83.2	$	84.7	$	17.1		$	94.1		$	903.0
Power	47.3		47.4		47.6		47.8		41.7			325.2			557.0
Other	147.7		42.3		30.0		25.1		19.4			117.7			382.2
Total contractual commitments	$	681.9	$	226.7	$	160.8	$	157.6	$	78.2		$	537.0		$	1,842.2



Evergy Kansas Central
	2020		2021		2022		2023		2024		After 2024			Total
Purchase commitments	(millions)
Fuel	$	269.9	$	33.0	$	47.2	$	45.7	$	11.5		$	59.0		$	466.3
Other	76.5		11.7		4.7		3.0		0.2			—			96.1
Total contractual commitments	$	346.4	$	44.7	$	51.9	$	48.7	$	11.7		$	59.0		$	562.4



Evergy Metro
	2020		2021		2022		2023		2024		After 2024			Total
Purchase commitments	(millions)
Fuel	$	180.2	$	92.5	$	36.0	$	39.0	$	5.6		$	35.1		$	388.4
Power	34.8		34.9		35.1		35.3		29.2			225.4			394.7
Other	58.4		29.0		24.2		21.6		18.7			112.9			264.8
Total contractual commitments	$	273.4	$	156.4	$	95.3	$	95.9	$	53.5		$	373.4		$	1,047.9

Fuel commitments consist of commitments for nuclear fuel, coal and coal transportation. Power commitments consist of certain commitments for renewable energy under power purchase agreements. Other represents individual commitments entered into in the ordinary course of business.

GUARANTEES

12 Months Ended

Dec. 31, 2019

Guarantees [Abstract]

GUARANTEES

In the ordinary course of business, Evergy and certain of its subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries. Such agreements include, for example, guarantees and letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit to accomplish the subsidiary's intended business purposes. In connection with the closing of the merger, Evergy assumed the guarantees previously provided to Evergy Missouri West by Great Plains Energy. The majority of these agreements guarantee Evergy's own future performance, so a liability for the fair value of the obligation is not recorded.

At December 31, 2019, Evergy has provided $110.2 million of credit support for Evergy Missouri West as follows:


•	Evergy direct guarantees to Evergy Missouri West counterparties totaling $17.0 million, which expire in 2020, and


•	Evergy's guarantee of Evergy Missouri West long-term debt totaling $93.2 million, which includes debt with maturity dates ranging from 2020 to 2023.

Evergy has also guaranteed Evergy Missouri West's commercial paper program. At December 31, 2019, Evergy Missouri West had $93.4 million of commercial paper outstanding. None of the guaranteed obligations are subject to default or prepayment if Evergy Missouri West's credit ratings were downgraded.

RELATED PARTY TRANSACTIONS AND RELATIONSHIPS

12 Months Ended

Dec. 31, 2019

In the normal course of business, Evergy Kansas Central, Evergy Metro and Evergy Missouri West engage in related party transactions with one another. A summary of these transactions and the amounts associated with them is provided below. Transactions between Evergy Kansas Central and either Evergy Metro or Evergy Missouri West prior to June 4, 2018, the date of the merger, are not reflected below.

Jointly-Owned Plants and Shared Services

Evergy Metro employees manage Evergy Missouri West's business and operate its facilities at cost, including Evergy Missouri West's 18% ownership interest in Evergy Metro's Iatan Nos. 1 and 2. The operating expenses and capital costs billed from Evergy Metro to Evergy Missouri West were $172.8 million for 2019, $183.2 million for 2018 and $196.3 million for 2017.

Evergy Kansas Central employees manage JEC and operate its facilities at cost, including Evergy Missouri West's 8% ownership interest in JEC. The operating expenses and capital costs billed from Evergy Kansas Central to Evergy Missouri West for JEC and other various business activities were $24.9 million for 2019 and $12.3 million for 2018.

Evergy Metro employees manage La Cygne Station and operate its facilities at cost, including Evergy Kansas Central's 50% interest in La Cygne Station. Evergy Metro and Evergy Kansas Central employees also provide one another with shared service support, including costs related to human resources, information technology, accounting and legal services. The operating expenses and capital costs billed from Evergy Metro to Evergy Kansas Central were $154.9 million for 2019 and $82.9 million for 2018. The operating and capital costs billed from Evergy Kansas Central to Evergy Metro were $40.6 million for 2019 and $17.5 million for 2018.

Money Pool

Evergy Metro and Evergy Missouri West are also authorized to participate in the Evergy, Inc. money pool, an internal financing arrangement in which funds may be lent on a short-term basis to Evergy Metro and Evergy Missouri West from Evergy, Inc. and between Evergy Metro and Evergy Missouri West. At December 31, 2019 and 2018, Evergy Metro had no outstanding receivables or payables under the money pool.

Related Party Net Receivables and Payables

The following table summarizes Evergy Kansas Central's and Evergy Metro's related party net receivables and payables.



	December 31
	2019			2018
Evergy Kansas Central	(millions)
Net receivable from Evergy Missouri West	$	3.1		$	2.6
Net payable to Evergy Metro	(14.9		)	(13.5		)
Net receivable from (payable to) Evergy	6.9			(1.4		)

Evergy Metro
Net receivable from Evergy Missouri West	$	78.7		$	72.6
Net receivable from Evergy Kansas Central	14.9			13.5
Net receivable from (payable to) Evergy	(4.3		)	15.7

Tax Allocation Agreement

Evergy files a consolidated federal income tax return as well as unitary and combined income tax returns in several state jurisdictions with Kansas and Missouri being the most significant. Income taxes for consolidated or combined subsidiaries are allocated to the subsidiaries based on separate company computations of income or loss. As of December 31, 2019 and 2018, Evergy Kansas Central had income taxes receivable from Evergy of $37.9 million and $42.7 million, respectively. As of December 31, 2019 and 2018, Evergy Metro had income taxes payable to Evergy of $14.1 million and $2.0 million, respectively.

Leases

Evergy Metro leases certain transmission equipment from Evergy Kansas Central. This lease was entered into prior to the merger in an arms-length transaction and is accounted for as an operating lease. As of December 31, 2019, Evergy Metro had a right-of-use asset of $29.5 million recorded within other long-term assets, $0.6 million of lease liability recorded in other current liabilities and $28.9 million of lease liability recorded in other long-term liabilities on its consolidated balance sheet related to this lease. The assets and liabilities related to this lease between Evergy Kansas Central and Evergy Metro are eliminated at consolidated Evergy.

SHAREHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

SHAREHOLDERS' EQUITY

Evergy's authorized capital stock consists of 600 million shares of common stock, without par value, and 12 million shares of Preference Stock, without par value.

Evergy Registration Statements

In November 2018, Evergy filed an automatic shelf registration statement providing for the sale of unlimited amounts of securities with the SEC, which expires in November 2021.

Evergy has registered shares of its common stock with the SEC for its Dividend Reinvestment and Direct Stock Purchase Plan. Shares issued under the plan may be either newly issued shares or shares purchased on the open market.

Evergy has registered shares of its common stock with the SEC for the Evergy, Inc. 401(k) Savings Plan. Shares issued under the plans may be either newly issued shares or shares purchased on the open market.

Common Stock Repurchase Program

In July 2018, the Evergy Board authorized the repurchase of up to 60 million shares of Evergy's common stock. Evergy has utilized various methods to effectuate the share repurchase program since its authorization, including the repurchase of shares through accelerated share repurchase (ASR) agreements and open market transactions. Evergy retires repurchased common stock shares in the period the shares are repurchased. For 2019, Evergy had total repurchases of common stock of $1,628.7 million and had repurchased 28.8 million shares under the repurchase program. Since the start of the repurchase program in August 2018, Evergy has made total repurchases of common stock of $2,671.0 million and has repurchased 45.2 million shares under the repurchase program. Evergy does not anticipate making additional repurchases of common stock under its share repurchase program while the Strategic Review & Operations Committee of the Evergy Board conducts its review of ways to enhance long-term shareholder value, which is expected to conclude in the first half of 2020.

The following table summarizes the ASRs completed as part of Evergy's common stock repurchase program.



Date ASR Entered	Final Settlement Date	Amount		Shares Delivered
		(millions)
August 2018	October/November 2018	$	450.0	7.9
November 2018	February 2019	475.0		8.3
March 2019	June 2019	450.0		7.8
June 2019	September 2019	500.0		8.1
September 2019	November/December 2019	500.0		7.8

Under the ASR agreements entered into with various financial institutions, Evergy was delivered a number of shares of its common stock based on the amount of the ASR agreement and the average daily volume-weighted average price of its common stock during the term of the ASR agreement, less a negotiated discount. Evergy reflects ASRs as a repurchase of common stock in the period the shares are delivered for purposes of calculating earnings per share and as forward contracts indexed to its own common stock. Evergy's ASRs have met all of the applicable criteria for equity classification and therefore are not accounted for as derivative instruments.

Dividend Restrictions

Evergy depends on its subsidiaries to pay dividends on its common stock. The Evergy Companies have certain restrictions stemming from statutory requirements, corporate organizational documents, covenants and other conditions that could affect dividend levels or the ability to pay dividends.

The KCC order authorizing the merger transaction requires Evergy to maintain consolidated common equity of at least 35% of total consolidated capitalization.

Under the Federal Power Act, Evergy Kansas Central, Evergy Metro and Evergy Missouri West generally can pay dividends only out of retained earnings. Certain conditions in the MPSC and KCC orders authorizing the merger transaction also require Evergy Kansas Central and Evergy Metro to maintain consolidated common equity of at least 40% of total capitalization. Other conditions in the MPSC and KCC merger orders require Evergy Kansas Central, Evergy Metro and Evergy Missouri West to maintain credit ratings of at least investment grade. If Evergy Kansas Central's, Evergy Metro's or Evergy Missouri West's credit ratings are downgraded below the investment grade level as a result of their affiliation with Evergy or any of Evergy's affiliates, the impacted utility shall not pay a dividend to Evergy without KCC or MPSC approval or until the impacted utility's investment grade credit rating has been restored.

The master credit facility of Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West and the note purchase agreements for certain Evergy Missouri West senior notes contain covenants requiring the respective company to maintain a consolidated indebtedness to consolidated total capitalization ratio of not more than 0.65 to 1.00 at all times.

As of December 31, 2019, all of Evergy's and Evergy Kansas Central's retained earnings and net income were free of restrictions and Evergy Metro had a retained earnings restriction of $152.0 million. Evergy's subsidiaries had restricted net assets of approximately $5.0 billion as of December 31, 2019. These restrictions are not expected to affect the Evergy Companies' ability to pay dividends at the current level for the foreseeable future.

VARIABLE INTEREST ENTITIES

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

VARIABLE INTEREST ENTITIES

In determining the primary beneficiary of a VIE, the Evergy Companies assess the entity's purpose and design, including the nature of the entity's activities and the risks that the entity was designed to create and pass through to its variable interest holders. A reporting enterprise is deemed to be the primary beneficiary of a VIE if it has (a) the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (b) the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE. The primary beneficiary of a VIE is required to consolidate the VIE. The trust holding an 8% interest in JEC was a VIE until the expiration of a purchase option in July 2017 and then again during 2019 until the 8% interest was purchased by Evergy Kansas Central in August 2019. The trust holding Evergy Kansas Central's 50% interest in La Cygne Unit 2 is a VIE and Evergy Kansas Central remains the primary beneficiary of the trust.

All involvement with entities by the Evergy Companies is assessed to determine whether such entities are VIEs and, if so, whether or not the Evergy Companies are the primary beneficiaries of the entities. The Evergy Companies also continuously assess whether they are the primary beneficiary of the VIE with which they are involved. Prospective changes in facts and circumstances may cause identification of the primary beneficiary to be reconsidered.

8% Interest in JEC

Under an agreement that expired in August 2019, Evergy Kansas Central leased an 8% interest in JEC from a trust. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 8% interest in JEC and lease it to a third party and did not hold any other assets. Evergy Kansas Central met the requirements to be considered the primary beneficiary of the trust until July 2017, when a contractual option to purchase the 8% interest in the plant covered by the lease expired. Accordingly, Evergy Kansas Central deconsolidated the trust in the third quarter of 2017. Evergy Kansas Central then reconsolidated the trust as a VIE in the first quarter of 2019 following an agreement with the owner to purchase the 8% interest in JEC from the trust in August 2019. Evergy Kansas Central deconsolidated the trust for the final time following the closing of this purchase in August 2019.

50% Interest in La Cygne Unit 2

Under an agreement that expires in September 2029, Evergy Kansas Central entered into a sale-leaseback transaction with a trust under which the trust purchased Evergy Kansas Central's 50% interest in La Cygne Unit 2 and subsequently leased it back to Evergy Kansas Central. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 50% interest in

La Cygne Unit 2 and lease it back to Evergy Kansas Central and does not hold any other assets. Evergy Kansas Central meets the requirements to be considered the primary beneficiary of the trust. In determining the primary beneficiary of the trust, Evergy Kansas Central concluded that the activities of the trust that most significantly impact its economic performance and that Evergy Kansas Central has the power to direct include (1) the operation and maintenance of the 50% interest in La Cygne Unit 2 and (2) Evergy Kansas Central's ability to exercise a purchase option at the end of the agreement at the lesser of fair value or a fixed amount. Evergy Kansas Central has the potential to receive benefits from the trust that could potentially be significant if the fair value of the 50% interest in La Cygne Unit 2 at the end of the agreement is greater than the fixed amount.

The following table summarizes the assets and liabilities related to the VIE described above that are recorded on Evergy's and Evergy Kansas Central's consolidated balance sheets.



	December 31
	2019		2018
Assets:	(millions)
Property, plant and equipment of variable interest entities, net	$	162.0	$	169.2
Liabilities:
Current maturities of long-term debt of variable interest entities	$	32.3	$	30.3
Accrued interest^(a)	0.3		0.5
Long-term debt of variable interest entities, net	18.8		51.1


^(a)	Included in accrued interest on Evergy's and Evergy Kansas Central's consolidated balance sheets.

All of the liabilities noted in the table above relate to the purchase of the property, plant and equipment of the VIE. The assets of the VIE can be used only to settle obligations of the VIE and the VIE's debt holders have no recourse to the general credit of Evergy and Evergy Kansas Central. Evergy and Evergy Kansas Central have not provided financial or other support to the VIE and are not required to provide such support. Evergy and Evergy Kansas Central did not record any gain or loss upon the initial consolidation of the VIE.

TAXES

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

TAXES

Components of income tax expense are detailed in the following tables.



Evergy	2019			2018			2017
Current income taxes	(millions)
Federal	$	(39.5	)	$	(67.4	)	$	0.1
State	15.0			2.2			0.4
Total	(24.5		)	(65.2		)	0.5
Deferred income taxes
Federal	93.2			160.1			122.8
State	27.5			(32.3		)	30.7
Total	120.7			127.8			153.5
Investment tax credit
Deferral	5.2			—			—
Amortization	(4.4		)	(3.6		)	(2.8		)
Total	0.8			(3.6		)	(2.8		)
Income tax expense	$	97.0		$	59.0		$	151.2



Evergy Kansas Central	2019			2018			2017
Current income taxes	(millions)
Federal	$	37.9		$	(0.3	)	$	0.1
State	2.6			(1.8		)	0.4
Total	40.5			(2.1		)	0.5
Deferred income taxes
Federal	(8.9		)	43.5			122.8
State	18.4			(42.9		)	30.7
Total	9.5			0.6			153.5
Investment tax credit
Deferral	5.2			—			—
Amortization	(3.1		)	(2.8		)	(2.8		)
Total	2.1			(2.8		)	(2.8		)
Income tax expense (benefit)	$	52.1		$	(4.3	)	$	151.2



Evergy Metro^(a)	2019			2018			2017
Current income taxes	(millions)
Federal	$	43.9		$	29.8		$	37.4
State	22.4			8.9			8.3
Total	66.3			38.7			45.7
Deferred income taxes
Federal	(24.5		)	(3.4		)	74.7
State	(5.0		)	53.0			8.8
Total	(29.5		)	49.6			83.5
Investment tax credit
Amortization	(1.1		)	(1.0		)	(1.0		)
Total	(1.1		)	(1.0		)	(1.0		)
Income tax expense	$	35.7		$	87.3		$	128.2

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Effective Income Tax Rates

Effective income tax rates reflected in the financial statements and the reasons for their differences from the statutory federal rates are detailed in the following tables.



Evergy	2019		2018		2017
Federal statutory income tax	21.0	%	21.0	%	35.0	%
COLI policies	(1.8	)	(1.9	)	(3.1	)
State income taxes	5.0		4.9		4.1
Flow through depreciation for plant-related differences	(4.5	)	0.8		2.3
Federal tax credits	(4.9	)	(6.4	)	(6.9	)
Non-controlling interest	(0.4	)	(0.4	)	(0.9	)
AFUDC equity	(0.1	)	(0.1	)	(0.2	)
Amortization of federal investment tax credits	(0.5	)	(0.6	)	(0.6	)
Changes in uncertain tax positions, net	(0.2	)	0.1		—
Federal or state tax rate change	—		(8.7	)	2.5
Valuation allowance	(1.0	)	0.4		0.3
Stock compensation	0.1		(0.4	)	(0.9	)
Officer compensation limitation	0.1		1.2		0.2
Other	(0.4	)	(0.2	)	(0.8	)
Effective income tax rate	12.4	%	9.7	%	31.0	%



Evergy Kansas Central	2019		2018		2017
Federal statutory income tax	21.0	%	21.0	%	35.0	%
COLI policies	(3.3	)	(3.3	)	(3.1	)
State income taxes	5.3		5.0		4.1
Flow through depreciation for plant-related differences	(0.1	)	1.6		2.3
Federal tax credits	(7.4	)	(10.4	)	(6.9	)
Non-controlling interest	(0.8	)	(0.6	)	(0.9	)
AFUDC equity	(0.1	)	(0.2	)	(0.2	)
Amortization of federal investment tax credits	(0.7	)	(0.8	)	(0.6	)
Changes in uncertain tax positions, net	(0.4	)	0.1		—
Federal or state tax rate change	—		(15.3	)	2.5
Valuation allowance	(0.4	)	0.5		0.3
Stock compensation	(0.1	)	(0.8	)	(0.9	)
Officer compensation limitation	—		1.8		0.2
Other	(0.3	)	0.2		(0.8	)
Effective income tax rate	12.7	%	(1.2	)%	31.0	%



Evergy Metro^(a)	2019		2018		2017
Federal statutory income tax	21.0	%	21.0	%	35.0	%
COLI policies	(0.2	)	(0.2	)	(0.3	)
State income taxes	4.7		5.5		3.8
Flow through depreciation for plant-related differences	(9.4	)	(2.5	)	0.5
Federal tax credits	(2.5	)	(2.1	)	(2.4	)
AFUDC equity	(0.2	)	(0.1	)	(0.7	)
Amortization of federal investment tax credits	(0.4	)	(0.4	)	(0.3	)
Federal or state tax rate change	—		14.1		5.3
Valuation allowance	—		—		0.4
Stock compensation	—		—		0.2
Officer compensation limitation	0.3		0.6		0.1
Other	(1.0	)	(1.0	)	—
Effective income tax rate	12.3	%	34.9	%	41.6	%

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Deferred Income Taxes

The tax effects of major temporary differences resulting in deferred income tax assets (liabilities) in the consolidated balance sheets is in the following table.



	December 31
	2019									2018
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Deferred tax assets:	(millions)
Tax credit carryforward	$	548.9		$	337.3		$	204.4		$	508.1		$	307.1		$	194.0
Income taxes refundable to customers, net	466.3			234.3			176.2			478.1			233.1			186.9
Deferred employee benefit costs	197.0			93.4			120.4			215.4			89.6			118.3
Net operating loss carryforward	163.4			23.1			61.9			383.3			60.7			119.2
Deferred state income taxes	64.4			64.4			—			62.5			62.5			—
Alternative minimum tax carryforward	37.9			13.4			—			73.4			26.7			—
Accrued liabilities	80.4			14.5			29.1			82.6			13.6			32.8
Other	183.2			99.1			55.1			193.5			101.7			46.7
Total deferred tax assets before valuation allowance	1,741.5			879.5			647.1			1,996.9			895.0			697.9
Valuation allowances	(17.5		)	—			—			(27.3		)	(1.7		)	—
Total deferred tax assets, net	1,724.0			879.5			647.1			1,969.6			893.3			697.9
Deferred tax liabilities:
Plant-related	(3,107.1		)	(1,481.7		)	(1,157.0		)	(3,164.9		)	(1,491.6		)	(1,199.7		)
Deferred employee benefit costs	(173.3		)	(93.4		)	(79.5		)	(199.9		)	(89.6		)	(86.1		)
Acquisition premium	(68.2		)	(68.2		)	—			(72.6		)	(72.6		)	—
Other	(119.8		)	(53.9		)	(53.4		)	(131.4		)	(54.9		)	(43.9		)
Total deferred tax liabilities	(3,468.4		)	(1,697.2		)	(1,289.9		)	(3,568.8		)	(1,708.7		)	(1,329.7		)
Net deferred income tax liabilities	$	(1,744.4	)	$	(817.7	)	$	(642.8	)	$	(1,599.2	)	$	(815.4	)	$	(631.8	)

Tax Credit Carryforwards

At December 31, 2019 and 2018, Evergy had $379.0 million and $333.8 million, respectively, of federal general business income tax credit carryforwards. At December 31, 2019 and 2018, Evergy Kansas Central had $168.8 million and $134.0 million, respectively, of federal general business income tax credit carryforwards. At December 31, 2019 and 2018, Evergy Metro had $203.2 million and $192.8 million, respectively, of federal general business income tax credit carryforwards. The carryforwards for Evergy, Evergy Kansas Central and Evergy Metro relate primarily to wind production tax credits and advanced coal investment tax credits and expire in the years 2020 to 2039. Approximately $0.4 million of Evergy's credits are related to Low Income Housing credits that were acquired in Great Plains Energy's acquisition of Evergy Missouri West. Due to federal limitations on the utilization of income tax attributes acquired in the Evergy Missouri West acquisition, Evergy expects a portion of these credits to expire unutilized and has provided a valuation allowance against $0.3 million of the federal income tax benefit.

The year of origin of Evergy's, Evergy Kansas Central's and Evergy Metro's related tax benefit amounts for federal tax credit carryforwards as of December 31, 2019 are detailed in the following table.



	Amount of Benefit
Year of Origin	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2000	$	7.3	$	7.3	$	—
2001	9.7		9.7		—
2002	0.3		0.2		—
2003	0.3		0.2		—
2004	0.3		0.2		—
2005	0.3		0.2		—
2006	0.3		0.2		—
2007	0.6		0.6		—
2008	39.8		0.5		38.9
2009	47.7		0.2		47.4
2010	18.4		—		18.2
2011	13.3		—		13.2
2012	14.4		3.6		10.7
2013	24.3		11.3		12.9
2014	24.1		10.7		13.0
2015	24.7		10.9		13.2
2016	27.1		11.0		12.4
2017	43.9		35.1		8.2
2018	43.9		36.3		7.5
2019	38.3		30.6		7.6
	$	379.0	$	168.8	$	203.2

At December 31, 2019 and 2018, Evergy had $169.9 million and $174.3 million, respectively, of tax benefits related to state income tax credit carryforwards. At December 31, 2019 and 2018, Evergy Kansas Central had $168.5 million and $173.1 million, respectively, of tax benefit related to state income tax credit carryforwards. At December 31, 2019 and 2018, Evergy Metro had $1.2 million of tax benefits related to state income tax credit carryforwards. The state income tax credits relate primarily to the Kansas high performance incentive program tax credits and expire in the years 2024 to 2034.

Net Operating Loss Carryforwards

At December 31, 2019 and 2018, Evergy had $132.4 million and $324.2 million, respectively, of tax benefits related to federal net operating loss (NOL) carryforwards. At December 31, 2019 and 2018, Evergy Kansas Central had $12.3 million and $40.1 million, respectively, of tax benefits related to federal NOL carryforwards. At December 31, 2019 and 2018, Evergy Metro had $56.2 million and $107.5 million, respectively, of tax benefits related to federal NOL carryforwards. Approximately $51.1 million at December 31, 2019 are tax benefits related to NOLs that were acquired in the Evergy Missouri West acquisition. Due to federal limitations on the utilization of income tax attributes acquired in the Evergy Missouri West acquisition, Evergy expects a portion of these credits to expire unutilized and has provided a valuation allowance against $7.1 million of the federal income tax benefit. The federal NOL carryforwards expire in years 2023 to 2037.

The year of origin of Evergy's, Evergy Kansas Central's and Evergy Metro's related tax benefit amounts for federal NOL carryforwards as of December 31, 2019 are detailed in the following table.



	Amount of Benefit
Year of Origin	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2005	$	19.1	$	—	$	—
2006	32.0		—		—
2014	2.8		0.2		0.9
2015	58.8		—		55.3
2016	4.6		—		—
2017	15.1		12.1		—
	$	132.4	$	12.3	$	56.2

In addition, Evergy also had deferred tax benefits of $31.0 million and $59.1 million related to state NOLs as of December 31, 2019 and 2018, respectively. Evergy Kansas Central had deferred tax benefits of $10.8 million and $20.6 million related to state NOLs as of December 31, 2019 and 2018, respectively. Evergy Metro had deferred tax benefits of $5.7 million and $11.7 million related to state NOLs as of December 31, 2019 and 2018, respectively. The state NOL carryforwards expire in years 2020 to 2038. Evergy does not expect to utilize $10.1 million of NOLs before the expiration date of the carryforwards of NOLs in certain states. Therefore, a valuation allowance has been provided against $10.1 million of state tax benefits.

Alternative Minimum Tax Carryforwards

At December 31, 2019 and 2018, Evergy had $37.9 million and $73.4 million, respectively, of federal alternative minimum tax (AMT) credit carryforwards. At December 31, 2019 and 2018, Evergy Kansas Central had $13.4 million and $26.7 million, respectively, of federal AMT carryforwards. These credits do not expire and can be used to reduce taxes paid in the future or become refundable starting in 2018.

Valuation Allowances

Evergy is required to assess the ultimate realization of deferred tax assets using a "more likely than not" assessment threshold. This assessment takes into consideration tax planning strategies within Evergy's control. As a result of this assessment, Evergy has established a partial valuation allowance for federal and state tax NOL carryforwards and tax credit carryforwards. During 2019, $9.8 million of tax benefit was recorded in continuing operations primarily related to AMT credits and the expiration of certain state NOL carryforwards.

Federal Tax Reform

In December 2017, the U.S. Congress passed and President Donald Trump signed Public Law No. 115-97, commonly referred to as the TCJA. The TCJA represents the first major reform in U.S. income tax law since 1986. Most notably, the TCJA reduces the current top corporate income tax rate from 35% to 21% beginning in 2018, repeals the corporate AMT, makes existing AMT tax credit carryforwards refundable, and changes the deductibility and taxability of certain items, among other things. Prior to the change in tax rates that has been reflected in their 2018 rate cases, Evergy Kansas Central, Evergy Metro and Evergy Missouri West recovered the cost of income taxes in rates from their customers based on the 35% federal corporate income tax rate.

In January 2018, the KCC issued an order requiring certain regulated public utilities, including Evergy Kansas Central and Evergy Metro, to begin recording a regulatory liability for the difference between the new federal corporate tax rate and amounts currently collected in rates. In the second quarter of 2018, Evergy Kansas Central and Evergy Metro entered into settlement agreements with KCC staff and other intervenors in which they further agreed to begin deferring any impacts of the TCJA on their excess accumulated deferred income taxes to a regulatory liability. The KCC approved these settlement agreements in June 2018. Evergy Metro and Evergy

Missouri West had also recorded regulatory liabilities in 2018 due to the probability that they would also be required to make similar refunds to their Missouri customers.

The final regulatory treatment of these regulatory liabilities for the refund of tax reform benefits was determined in each of Evergy Kansas Central's, Evergy Metro's and Evergy Missouri West's rate cases with the KCC and MPSC. See Note 5 for more information and the amounts of the regulatory liabilities recorded by the Evergy Companies.

Missouri Tax Reform

On June 1, 2018, the Missouri governor signed Senate Bill (S.B.) 884 into law. Most notably, S.B. 884 reduces the corporate income tax rate from 6.25% to 4.0% beginning in 2020, provides for the mandatory use of the single sales factor formula and eliminates intercompany transactions between corporations that file a consolidated Missouri income tax return.

As a result of the change in the Missouri corporate income tax rate, Evergy Metro revalued and restated its deferred income tax assets and liabilities as of June 1, 2018. Evergy Metro decreased its net deferred income tax liabilities by $46.6 million, primarily consisting of a $28.8 million adjustment for the revaluation and restatement of deferred income tax assets and liabilities included in Missouri jurisdictional rate base and a $9.9 million tax gross-up adjustment for ratemaking purposes. The decrease to Evergy Metro's net deferred income tax liabilities included in Missouri jurisdictional rate base were offset by a corresponding increase in regulatory liabilities. The net regulatory liabilities will be amortized to customers over a period to be determined in a future rate case.

Evergy Metro recognized $15.5 million of income tax benefit primarily related to the difference between Evergy Metro's revaluation of its deferred income tax assets and liabilities for financial reporting purposes and the amount of the revaluation pertaining to Evergy Metro's Missouri jurisdictional rate base.

LEASES

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

LEASES

The Evergy Companies lease office buildings, computer equipment, vehicles, rail cars, generating plant and other property and equipment, including rail cars to serve jointly-owned generating units where Evergy Kansas Central or Evergy Metro is the managing partner and is reimbursed by other joint-owners for the other owners' proportionate share of the costs. Under GAAP, a contract is or contains a lease if the contract conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. The Evergy Companies assess a contract as being or containing a lease if the contract identifies property, plant and equipment, provides the lessee the right to obtain substantially all of the economic benefits from use of the property, plant and equipment and provides the lessee the right to direct the use of the property, plant and equipment.

The Evergy Companies have entered into several agreements to purchase energy through renewable purchase power agreements that are accounted for as leases that commenced prior to the application of Topic 842. Due to the intermittent nature of renewable generation, these leases have significant variable lease payments not included in the initial and subsequent measurement of the lease liability. Variable lease payments are expensed as incurred. In addition, certain other contracts contain payment for activity that transfers a separate good or service such as utilities or common area maintenance. The Evergy Companies have elected a practical expedient permitted by GAAP to not separate such components of the lease from other lease components for all leases.

The Evergy, Evergy Kansas Central and Evergy Metro leases have remaining terms ranging from 1 to 19 years, 1 to 19 years and 1 to 26 years, respectively. Leases that have original lease terms of twelve months or less are not recognized on the Evergy Companies’ balance sheets. Some leases have options to renew the lease or terminate early at the election of the Evergy Companies. Judgment is applied at lease commencement to determine the reasonably certain lease term based on then-current assumptions about use of the leased asset, market conditions and terms in the contract. The judgment applied to determine the lease term can significantly impact the measurement of the lease liability and right-of-use asset and lease classification.

The Evergy Companies typically discount lease payments over the term of the lease using their incremental borrowing rates at lease commencement to measure its initial and subsequent lease liability. For leases that existed

at the initial application of Topic 842, the Evergy Companies used the incremental borrowing rates that corresponded to the remaining lease term as of January 1, 2019.

Leases may be classified as either operating leases or finance leases. The lease classification is based on assumptions of the lease term and discount rate, as discussed above, and the fair market value and economic life of the leased asset. Operating leases recognize a consistent expense each period over the lease term, while finance leases will result in the separate presentation of interest expense on the lease liability and amortization of the right-of-use asset. Finance leases are treated as operating leases for rate-making purposes and as such, the Evergy Companies defer to a regulatory asset or liability any material differences between expense recognition and the timing of payments in order to match what is being recovered in customer rates.

The Evergy Companies’ lease expense is detailed in the following table.



Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Finance lease costs	(millions)
Amortization of right-of-use assets	$	5.2	$	5.0	$	0.1
Interest on lease liabilities	2.9		2.7		0.1
Operating lease costs	23.8		13.2		9.2
Short-term lease costs	4.0		1.2		2.6
Variable lease costs for renewable purchase power agreements	313.0		130.8		129.2
Total lease costs	$	348.9	$	152.9	$	141.2

Supplemental cash flow information related to the Evergy Companies' leases is detailed in the following table.



Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	21.7	$	13.7	$	9.9
Operating cash flows from finance leases	2.8		2.6		0.1
Financing cash flows from finance leases	5.0		4.8		0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	10.4		6.1		2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	8.3		8.3		—

Finance Leases

Right-of-use assets for finance leases are included in property, plant and equipment on the Evergy Companies’ balance sheets. Lease liabilities for finance leases are included in other current and other long-term liabilities. Payments and other supplemental information for finance leases as of December 31, 2019, are detailed in the following table.



	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2020	$	8.1		$	7.6		$	0.2
2021	7.4			7.0			0.2
2022	6.7			6.2			0.2
2023	5.8			5.4			0.2
2024	4.7			4.3			0.2
After 2024	46.2			44.6			0.9
Total finance lease payments	78.9			75.1			1.9
Amounts representing imputed interest	(26.1		)	(25.0		)	(0.5		)
Present value of lease payments	52.8			50.1			1.4
Less: current portion	(4.9		)	(4.7		)	(0.1		)
Total long-term obligations under finance leases	$	47.9		$	45.4		$	1.3

Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$	302.8		$	43.5		$	1.4

Weighted-average remaining lease term (years)	14.3			14.6			8.7
Weighted-average discount rate	5.6		%	5.5		%	7.6		%

Operating Leases

Right-of-use assets for operating leases are included in other long-term assets on the Evergy Companies’ balance sheets. Lease liabilities for operating leases are included in other current and other long-term liabilities. Lease payments and other supplemental information for operating leases as of December 31, 2019, are detailed in the following table.



	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2020	$	20.5		$	11.6		$	10.7
2021	17.0			8.6			10.1
2022	14.1			6.4			9.3
2023	11.0			3.8			8.8
2024	9.2			2.3			8.5
After 2024	44.7			1.5			82.8
Total operating lease payments	116.5			34.2			130.2
Amounts representing imputed interest	(18.5		)	(2.3		)	(35.4		)
Present value of lease payments	98.0			31.9			94.8
Less: current portion	(15.6		)	(9.1		)	(7.0		)
Total long-term obligations under operating leases	$	82.4		$	22.8		$	87.8

Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$	104.5		$	39.4		$	76.6

Weighted-average remaining lease term (years)	8.8			3.8			15.8
Weighted-average discount rate	3.8		%	3.4		%	4.2		%

LEASES

at the initial application of Topic 842, the Evergy Companies used the incremental borrowing rates that corresponded to the remaining lease term as of January 1, 2019.

The Evergy Companies’ lease expense is detailed in the following table.



Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Finance lease costs	(millions)
Amortization of right-of-use assets	$	5.2	$	5.0	$	0.1
Interest on lease liabilities	2.9		2.7		0.1
Operating lease costs	23.8		13.2		9.2
Short-term lease costs	4.0		1.2		2.6
Variable lease costs for renewable purchase power agreements	313.0		130.8		129.2
Total lease costs	$	348.9	$	152.9	$	141.2

Supplemental cash flow information related to the Evergy Companies' leases is detailed in the following table.



Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	21.7	$	13.7	$	9.9
Operating cash flows from finance leases	2.8		2.6		0.1
Financing cash flows from finance leases	5.0		4.8		0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	10.4		6.1		2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	8.3		8.3		—

Finance Leases



	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2020	$	8.1		$	7.6		$	0.2
2021	7.4			7.0			0.2
2022	6.7			6.2			0.2
2023	5.8			5.4			0.2
2024	4.7			4.3			0.2
After 2024	46.2			44.6			0.9
Total finance lease payments	78.9			75.1			1.9
Amounts representing imputed interest	(26.1		)	(25.0		)	(0.5		)
Present value of lease payments	52.8			50.1			1.4
Less: current portion	(4.9		)	(4.7		)	(0.1		)
Total long-term obligations under finance leases	$	47.9		$	45.4		$	1.3

Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$	302.8		$	43.5		$	1.4

Weighted-average remaining lease term (years)	14.3			14.6			8.7
Weighted-average discount rate	5.6		%	5.5		%	7.6		%

Operating Leases



	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2020	$	20.5		$	11.6		$	10.7
2021	17.0			8.6			10.1
2022	14.1			6.4			9.3
2023	11.0			3.8			8.8
2024	9.2			2.3			8.5
After 2024	44.7			1.5			82.8
Total operating lease payments	116.5			34.2			130.2
Amounts representing imputed interest	(18.5		)	(2.3		)	(35.4		)
Present value of lease payments	98.0			31.9			94.8
Less: current portion	(15.6		)	(9.1		)	(7.0		)
Total long-term obligations under operating leases	$	82.4		$	22.8		$	87.8

Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$	104.5		$	39.4		$	76.6

Weighted-average remaining lease term (years)	8.8			3.8			15.8
Weighted-average discount rate	3.8		%	3.4		%	4.2		%

QUARTERLY OPERATING RESULTS (UNAUDITED)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY OPERATING RESULTS (UNAUDITED)



	Quarter
Evergy	1st		2nd		3rd		4th
2019	(millions, except per share amounts)
Operating revenue	$	1,216.9	$	1,221.7	$	1,577.6	$	1,131.6
Operating income	209.6		271.7		538.7		165.8
Net income	103.4		144.6		370.9		66.7
Net income attributable to Evergy, Inc.	99.5		139.7		366.8		63.9
Basic and diluted earnings per common share	0.39		0.57		1.56		0.28
2018
Operating revenue	$	600.2	$	893.4	$	1,582.5	$	1,199.8
Operating income	123.5		126.9		533.1		150.1
Net income	62.9		104.4		357.6		21.1
Net income attributable to Evergy, Inc.	60.5		101.8		355.0		18.5
Basic and diluted earnings per common share	0.42		0.56		1.32		0.07



	Quarter
Evergy Kansas Central	1st		2nd		3rd		4th
2019	(millions)
Operating revenue	$	596.8	$	585.5	$	749.0	$	576.1
Operating income	124.3		127.6		242.4		102.2
Net income	68.3		67.2		168.2		55.4
Net income attributable to Evergy Kansas Central, Inc.	64.4		62.3		164.1		52.6
2018
Operating revenue	$	600.2	$	650.9	$	764.8	$	599.0
Operating income	123.5		76.1		256.9		94.0
Net income	62.9		77.6		178.0		30.6
Net income attributable to Evergy Kansas Central, Inc.	60.5		75.0		175.4		28.0



	Quarter
Evergy Metro	1st		2nd		3rd		4th
2019	(millions)
Operating revenue	$	425.4	$	437.0	$	568.8	$	375.3
Operating income	56.9		101.9		215.5		52.2
Net income	16.0		59.4		151.9		27.9
2018
Operating revenue	$	397.1	$	452.2	$	559.6	$	414.2
Operating income	61.0		114.7		189.4		44.7
Net income (loss)	20.2		24.6		120.3		(2.2		)

Quarterly data is subject to seasonal fluctuations with peak periods occurring in the summer months. Evergy's results reflect the results of operations of Evergy Kansas Central for all periods in 2018 and Evergy Metro and Evergy Missouri West beginning with the quarter ended June 30, 2018. See Note 1 for more information.

Schedule I Financial Statements of Parent Company

12 Months Ended

Dec. 31, 2019

Condensed Financial Information Disclosure [Abstract]

Condensed Financial Information of Parent Company Only Disclosure



EVERGY, INC.
Statements of Income of Parent Company

	2019			Period from June 4, 2018 through December 31, 2018
OPERATING EXPENSES:	(millions)
Operating and maintenance	$	19.4		$	54.6
Total Operating Expenses	19.4			54.6
INCOME FROM OPERATIONS	(19.4		)	(54.6		)
OTHER INCOME (EXPENSE)
Equity in earnings from subsidiaries	698.2			364.7
Investment earnings	32.7			26.3
Other expense	(0.1		)	(2.6		)
Total Other Income, Net	730.8			388.4
Interest expense	60.7			19.6
INCOME BEFORE INCOME TAXES	650.7			314.2
Income tax benefit	(13.7		)	(10.7		)
NET INCOME	$	664.4		$	324.9
COMPREHENSIVE INCOME
NET INCOME	$	664.4		$	324.9
OTHER COMPREHENSIVE INCOME
Derivative hedging activity
Loss on derivative hedging instruments	(64.4		)	(5.4		)
Income tax benefit	16.5			1.4
Net loss on derivative hedging instruments	(47.9		)	(4.0		)
Reclassification to expenses, net of taxes	1.5			—
Derivative hedging activity, net of tax	(46.4		)	(4.0		)
Other comprehensive income from subsidiaries, net	(0.6		)	1.0
Total other comprehensive loss	(47.0		)	(3.0		)
COMPREHENSIVE INCOME	$	617.4		$	321.9

The accompanying Notes to Financial Statements of Parent Company are an integral part of these statements.



EVERGY, INC.
Balance Sheets of Parent Company
	December 31
	2019			2018
ASSETS	(millions, except share amounts)
CURRENT ASSETS:
Cash and cash equivalents	$	11.6			$	107.1
Accounts receivable from subsidiaries	24.5				35.2
Notes receivable from subsidiaries	2.0				2.0
Income taxes receivable	8.0				0.2
Prepaid expenses and other assets	2.4				2.0
Total Current Assets	48.5				146.5
OTHER ASSETS:
Investment in subsidiaries	10,023.1				9,785.6
Note receivable from subsidiaries	634.9				634.9
Deferred income taxes	34.2				36.3
Other	0.9				1.1
Total Other Assets	10,693.1				10,457.9
TOTAL ASSETS	$	10,741.6			$	10,604.4
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Notes payable	$	20.0			$	—
Accounts payable to subsidiaries	13.1				28.1
Accrued interest	14.6				2.1
Derivative instruments	—				5.4
Other	8.1				6.3
Total Current Liabilities	55.8				41.9
LONG-TERM LIABILITIES:
Long-term debt, net	2,223.7				638.1
Other	16.9				17.6
Total Long-Term Liabilities	2,240.6				655.7
Commitments and Contingencies (Note 15)
EQUITY:
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value, 226,641,443 shares issued	7,053.7				8,668.3
Retained earnings	1,441.5				1,241.5
Accumulated other comprehensive loss	(50.0		)		(3.0		)
Total shareholders' equity	8,445.2				9,906.8
TOTAL LIABILITIES AND EQUITY	$	10,741.6			10,604.4

The accompanying Notes to Financial Statements of Parent Company are an integral part of these statements.



EVERGY, INC.
Statements of Cash Flows of Parent Company

	2019			Period from June 4, 2018 through December 31, 2018
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:	(millions)
Net income	$	664.4		$	324.9
Adjustments to reconcile income to net cash from operating activities:
Non-cash compensation	16.3			10.0
Net deferred income taxes and credits	21.4			(6.3		)
Equity in earnings from subsidiaries	(698.2		)	(364.7		)
Other	2.1			—
Changes in working capital items:
Accounts receivable from subsidiaries	8.9			(8.5		)
Income taxes receivable	(7.8		)	(0.2		)
Prepaid expenses and other current assets	(0.1		)	(1.0		)
Accounts payable to subsidiaries	(15.0		)	4.7
Accrued taxes	—			(35.2		)
Accrued interest	12.5			(13.6		)
Other current liabilities	1.7			2.4
Cash dividends from subsidiaries	460.0			236.0
Changes in other assets	0.2			0.1
Changes in other liabilities	(3.5		)	20.0
Cash Flows from Operating Activities	462.9			168.6
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Cash acquired from the merger with Great Plains Energy	—			1,142.2
Proceeds from interest rate swap	—			140.6
Cash Flows from Investing Activities	—			1,282.8
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net	20.0			(56.1		)
Proceeds from long-term debt	1,585.0			—
Payment for settlement of interest rate swap accounted for as a cash flow hedge	(69.8		)	—
Cash dividends paid	(462.5		)	(245.9		)
Repurchase of common stock	(1,628.7		)	(1,042.3		)
Other financing activities	(2.4		)	—
Cash Flows used in Financing Activities	(558.4		)	(1,344.3		)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(95.5		)	107.1
CASH AND CASH EQUIVALENTS:
Beginning of period	107.1			—
End of period	$	11.6		$	107.1

The accompanying Notes to Financial Statements of Parent Company are an integral part of these statements.

1. ORGANIZATION AND BASIS OF PRESENTATION

The Evergy, Inc. Parent Company Financial Statements have been prepared to comply with Rule 12-04 of Regulation S-X.

Evergy, Inc. was incorporated in 2017 as Monarch Energy, a wholly-owned subsidiary of Great Plains Energy. Prior to the closing of the merger transactions, Monarch Energy changed its name to Evergy, Inc. and did not conduct any business activities other than those required for its formation and matters contemplated by the Amended Merger Agreement. On June 4, 2018, in accordance with the Amended Merger Agreement, Great Plains Energy merged into Evergy, Inc., with Evergy, Inc. surviving the merger and King Energy merged into Evergy Kansas Central, with Evergy Kansas Central surviving the merger. These merger transactions resulted in Evergy, Inc. becoming the parent entity of Evergy Kansas Central and the direct subsidiaries of Great Plains Energy, including Evergy Metro and Evergy Missouri West.

See Note 2 to the consolidated financial statements for additional information regarding the merger.

Evergy, Inc. operates primarily through its wholly-owned direct subsidiaries. Evergy, Inc.'s investments in subsidiaries are accounted for using the equity method. Fair value adjustments and goodwill related to the acquired assets and liabilities of Great Plains Energy and its direct subsidiaries are only reflected on Evergy's consolidated financial statements and as such, are not included in Evergy, Inc.'s Parent Company Financial Statements. See Note 1 to the consolidated financial statement for additional information.

2. LONG-TERM DEBT

See Note 13 to the consolidated financial statements for additional information on Evergy, Inc.'s long-term debt.

3. GUARANTEES

See Note 16 to the consolidated financial statements for additional information regarding Evergy, Inc.'s guarantees.

4. DIVIDENDS

Cash dividends paid to Evergy, Inc. by its subsidiaries were $460.0 million for the year ended December 31, 2019 and $236.0 million for the period from June 4, 2018 through December 31, 2018. See Note 18 to the consolidated financial statements for information regarding the dividend restrictions of Evergy, Inc. and its subsidiaries.

Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II Valuation and Qualifying Accounts



Evergy, Inc.
Valuation and Qualifying Accounts
Years Ended December 31, 2019, 2018 and 2017

				Additions
				Charged
	Balance At			To Costs			Charged								Balance
	Beginning			And			To Other								At End
Description	Of Period			Expenses			Accounts				Deductions				Of Period
Year Ended December 31, 2019	(millions)
Allowance for uncollectible accounts		$	9.2		$	27.2		$	12.4	^(a)		$	38.3	^(b)		$	10.5
Tax valuation allowance		27.3			0.6			—				10.4		^(c)		17.5
Year Ended December 31, 2018
Allowance for uncollectible accounts		$	6.7		$	20.7		$	16.9	^(e)		$	35.1	^(b)		$	9.2
Tax valuation allowance		—			2.2			26.8		^(d)		1.7		^(c)		27.3
Year Ended December 31, 2017
Allowance for uncollectible accounts		$	6.7		$	10.5		$	7.0	^(a)		$	17.5	^(b)		$	6.7

^(a)Recoveries.

^(b)Uncollectible accounts charged off.

^(c)Reversal of tax valuation allowance.

^(d) Primarily represents the addition of Great Plains Energy's allowance as of the date of the merger.

^(e) Recoveries and the addition of Great Plains Energy's allowance as of the date of the merger.



Evergy Kansas Central, Inc.
Valuation and Qualifying Accounts
Years Ended December 31, 2019, 2018 and 2017

				Additions
				Charged
	Balance At			To Costs			Charged								Balance
	Beginning			And			To Other								At End
Description	Of Period			Expenses			Accounts				Deductions				Of Period
Year Ended December 31, 2019	(millions)
Allowance for uncollectible accounts		$	3.9		$	7.2		$	3.4	^(a)		$	10.7	^(b)		$	3.8
Tax valuation allowance		1.7			—			—				1.7		^(c)		—
Year Ended December 31, 2018
Allowance for uncollectible accounts		$	6.7		$	9.0		$	7.4	^(a)		$	19.2	^(b)		$	3.9
Tax valuation allowance		—			1.7			—				—				1.7
Year Ended December 31, 2017
Allowance for uncollectible accounts		$	6.7		$	10.5		$	7.0	^(a)		$	17.5	^(b)		$	6.7

^(a)Recoveries.

^(b)Uncollectible accounts charged off.

^(c) Reversal of tax valuation allowance.



Evergy Metro, Inc.
Valuation and Qualifying Accounts
Years Ended December 31, 2019, 2018 and 2017

				Additions
				Charged
	Balance At			To Costs			Charged								Balance
	Beginning			And			To Other								At End
Description	Of Period			Expenses			Accounts				Deductions				Of Period
Year Ended December 31, 2019	(millions)
Allowance for uncollectible accounts		$	3.8		$	13.7		$	6.3	^(a)		$	19.2	^(b)		$	4.6
Year Ended December 31, 2018
Allowance for uncollectible accounts		$	2.2		$	13.1		$	4.4	^(a)		$	15.9	^(b)		$	3.8
Year Ended December 31, 2017
Allowance for uncollectible accounts		$	1.8		$	7.5		$	5.6	^(a)		$	12.7	^(b)		$	2.2
Tax valuation allowance		—			1.2			—				1.2		^(c)		—

^(a) Recoveries.

^(b) Uncollectible accounts charged off.

^(c) Reversal of tax valuation allowance.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2019
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation Evergy Kansas Central was determined to be the accounting acquirer in the merger and thus, the predecessor of Evergy. Therefore, Evergy's consolidated financial statements reflect the results of operations of Evergy Kansas Central for 2017. Evergy had separate operations for the period beginning with the quarter ended June 30, 2018, and references to amounts for periods after the closing of the merger relate to Evergy. The results of Great Plains Energy's direct subsidiaries have been included in Evergy's results of operations from the date of the closing of the merger and thereafter. Evergy Metro elected not to apply "push-down accounting" related to the merger, whereby the adjustments of assets and liabilities to fair value and the resulting goodwill would be recorded on the financial statements of the acquired subsidiary. These adjustments for Evergy Metro, as well as those related to the acquired assets and liabilities of Great Plains Energy and its other direct subsidiaries, are only reflected on Evergy's consolidated financial statements. Each of Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated financial statements includes the accounts of their subsidiaries and variable interest entities (VIEs) of which they are the primary beneficiary. Undivided interests in jointly-owned generation facilities are included on a proportionate basis. Intercompany transactions have been eliminated. The Evergy Companies assess financial performance and allocate resources on a consolidated basis (i.e., operate in one segment).
Use of Estimates	Use of Estimates The process of preparing financial statements in conformity with generally accepted accounting principles (GAAP) requires the use of estimates and assumptions that affect the reported amounts of certain types of assets, liabilities, revenues and expenses. Such estimates primarily relate to unsettled transactions and events as of the date of the financial statements. Accordingly, upon settlement, actual results may differ from estimated amounts.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash equivalents consist of highly liquid investments with original maturities of three months or less at acquisition.
Fuel Inventory and Supplies	Fuel Inventory and Supplies The Evergy Companies record fuel inventory and supplies at average cost.
Property, Plant and Equipment	Property, Plant and Equipment The Evergy Companies record the value of property, plant and equipment, including that of VIEs, at cost. For plant, cost includes contracted services, direct labor and materials, indirect charges for engineering and supervision and an allowance for funds used during construction (AFUDC). AFUDC represents the allowed cost of capital used to finance utility construction activity. AFUDC equity funds are included as a non-cash item in other income and AFUDC borrowed funds are a reduction of interest expense. AFUDC is computed by applying a composite rate to qualified construction work in progress. The rates used to compute gross AFUDC are compounded semi-annually. When property units are retired or otherwise disposed, the original cost, net of salvage, is charged to accumulated depreciation. Repair of property and replacement of items not considered to be units of property are expensed as incurred, except for planned refueling and maintenance outages at Wolf Creek Generating Station (Wolf Creek). As authorized by regulators, the incremental maintenance cost incurred for such outages is deferred and amortized to expense ratably over the period between planned outages.
Depreciation and Amortization	Depreciation and Amortization Depreciation and amortization of utility plant other than nuclear fuel is computed using the straight-line method over the estimated lives of depreciable property based on rates approved by state regulatory authorities. Annual depreciation rates average approximately 3%. See Note 8 for more details. Nuclear fuel is amortized to fuel expense based on the quantity of heat produced during the generation of electricity.
Plant to be Retired, Net	Plant to be Retired, Net When the Evergy Companies retire utility plant, the original cost, net of salvage, is charged to accumulated depreciation. However, when it becomes probable an asset will be retired significantly in advance of its original expected useful life and in the near term, the cost of the asset and related accumulated depreciation is recognized as a separate asset and a probable abandonment. If the asset is still in service, the net amount is classified as plant to be retired, net on the consolidated balance sheets. If the asset is no longer in service, the net amount is classified as a regulatory asset on the consolidated balance sheets. The Evergy Companies must also assess the probability of full recovery of the remaining net book value of the abandonment. The net book value that may be retained as an asset on the balance sheet for the abandonment is dependent upon amounts that may be recovered through regulated rates, including any return. An impairment charge, if any, would equal the difference between the remaining net book value of the asset and the present value of the future revenues expected from the asset. Evergy Missouri West has determined that its November 2018 retirement of Sibley No. 3 Unit meets the criteria to be considered an abandonment. As of December 31, 2019, Evergy has classified the remaining Sibley No. 3 Unit net book value of $130.5 million as retired generation facilities within regulatory assets on its consolidated balance sheet. This regulatory asset is reduced by approximately $9 million of annual amortization expense which is an amount equal to the annual depreciation expense for the asset reflected in retail rates. In October 2019, the Missouri Public Service Commission (MPSC) granted the request of certain intervenors for an Accounting Authority Order (AAO) that requires Evergy Missouri West to record a regulatory liability for all revenues collected from customers for return on investment, non-fuel operations and maintenance costs, taxes including accumulated deferred income taxes and all other costs associated with Sibley Station following the station's retirement in November 2018 for consideration in Evergy Missouri West's next rate case, which is expected to be completed no later than 2022. See Note 5 for additional information regarding the AAO. Evergy Missouri West expects that the MPSC's decision in its next rate case regarding the AAO could impact the valuation of its regulatory asset for retired generation facilities but as of December 31, 2019, has concluded that no impairment is required based on the relevant facts and circumstances.
Nuclear Plant Decommissioning Costs	Nuclear Plant Decommissioning Costs Nuclear plant decommissioning cost estimates are based on either the immediate dismantlement method or the deferred dismantling method as determined by the State Corporation Commission of the State of Kansas (KCC) and MPSC and include the costs of decontamination, dismantlement and site restoration. Based on these cost estimates, Evergy Kansas Central and Evergy Metro each contribute to a tax-qualified trust fund to be used to decommission Wolf Creek. Related liabilities for decommissioning are included on Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated balance sheets in asset retirement obligations (AROs). As a result of the authorized regulatory treatment and related regulatory accounting, differences between the decommissioning trust fund asset and the related ARO are recorded as a regulatory asset or liability.
Regulatory Accounting	Regulatory Accounting Accounting standards are applied that recognize the economic effects of rate regulation. Accordingly, regulatory assets and liabilities have been recorded when required by a regulatory order or based on regulatory precedent.
Cash Surrender Value of Life Insurance	Cash Surrender Value of Life Insurance Amounts related to corporate-owned life insurance (COLI) are recorded on the consolidated balance sheets in other long-terms assets and are detailed in the following table for Evergy. Substantially all of Evergy's COLI-related balances relate to Evergy Kansas Central's COLI activity. Increases in cash surrender value and death benefits are recorded in other income in the Evergy Companies' consolidated statements of income and comprehensive income. Interest expense incurred on policy loans is offset against the policy income. Income from death benefits is highly variable from period to period.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The following methods and assumptions were used to estimate the fair value of the following financial instruments for which it was practicable to estimate that value. Nuclear decommissioning trust fund - The Evergy Companies' nuclear decommissioning trust fund assets are recorded at fair value based on quoted market prices of the investments held by the fund and/or valuation models. Pension plans - For financial reporting purposes, the market value of plan assets is the fair value.
Revenue Recognition	Revenue Recognition The Evergy Companies recognize revenue on the sale of electricity to customers over time as the service is provided in the amount they have the right to invoice. Revenues recorded include electric services provided but not yet billed by the Evergy Companies. Unbilled revenues are recorded for kWh usage in the period following the customers' billing cycle to the end of the month. This estimate is based on net system kWh usage less actual billed kWhs. The Evergy Companies' estimated unbilled kWhs are allocated and priced by regulatory jurisdiction across the rate classes based on actual billing rates. The Evergy Companies' unbilled revenue estimate is affected by factors including fluctuations in energy demand, weather, line losses and changes in the composition of customer classes. See Note 4 for the balance of unbilled receivables for each of Evergy, Evergy Kansas Central and Evergy Metro as of December 31, 2019 and 2018. The Evergy Companies also collect sales taxes and franchise fees from customers concurrent with revenue-producing activities that are levied by state and local governments. These items are excluded from revenue, and thus are not reflected on the consolidated statements of income and comprehensive income for Evergy, Evergy Kansas Central and Evergy Metro.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The Evergy Companies determine their allowance for doubtful accounts based on the age of their receivables. Receivables are charged off when they are deemed uncollectible, which is based on a number of factors including specific facts surrounding an account and management's judgment.
Property Gains and Losses	Property Gains and Losses Net gains and losses from the sale of assets and businesses and from asset impairments are recorded in operating expenses.
Asset Impairments	Asset Impairments Long-lived assets and finite-lived intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If the sum of the undiscounted expected future cash flows from an asset to be held and used is less than the carrying value of the asset, an asset impairment must be recognized in the financial statements. The amount of impairment recognized is the excess of the carrying value of the asset over its fair value. Goodwill and indefinite lived intangible assets are tested for impairment annually and when an event occurs indicating the possibility that an impairment exists. The annual test must be performed at the same time each year. The goodwill impairment test consists of comparing the fair value of a reporting unit to its carrying amount, including goodwill, to identify potential impairment. In the event that the carrying amount exceeds the fair value of the reporting unit, an impairment loss is recognized for the difference between the carrying amount of the reporting unit and its fair value.
Income Taxes	Income Taxes Income taxes are accounted for using the asset/liability approach. Deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and tax bases of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion of the deferred tax assets will not be realized. The Evergy Companies recognize tax benefits based on a "more-likely-than-not" recognition threshold. In addition, the Evergy Companies recognize interest accrued related to unrecognized tax benefits in interest expense and penalties in operating expenses. Evergy files a consolidated federal income tax return as well as unitary and combined income tax returns in several state jurisdictions with Kansas and Missouri being the most significant. Income taxes for consolidated or combined subsidiaries are allocated to the subsidiaries based on separate company computations of income or loss. Evergy Kansas Central's and Evergy Metro's income tax provisions include taxes allocated based on their separate company's income or loss. The Evergy Companies have established a net regulatory liability for future refunds to be made to customers for the over-collection of income taxes in rates. Tax credits are recognized in the year generated except for certain Evergy Kansas Central, Evergy Metro and Evergy Missouri West investment tax credits that have been deferred and amortized over the remaining service lives of the related properties.
Earnings Per Share	Earnings Per Share To compute basic earnings per share (EPS), Evergy divides net income attributable to Evergy, Inc. by the weighted average number of common shares outstanding. Diluted EPS includes the effect of issuable common shares resulting from restricted share units (RSUs), performance shares and restricted stock. Evergy computes the dilutive effects of potential issuances of common shares using the treasury stock method.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards Leases In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires an entity that is a lessee to record a right-of-use asset and a lease liability for lease payments on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. Lessor accounting remains largely unchanged. In January 2018, the FASB issued ASU No. 2018-01, Leases: Land Easement Practical Expedient for Transition to Topic 842, which permits entities to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which updates narrow aspects of the guidance issued in ASU No. 2016-02. Also in July 2018, the FASB issued ASU No. 2018-11, Leases: Targeted Improvements, which provides an optional transition method that allows entities to initially apply Topic 842 at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restating prior periods. In December 2018, the FASB issued ASU No. 2018-20, Leases: Narrow-Scope Improvements for Lessors, which is expected to reduce a lessor's implementation and ongoing costs associated with applying ASU No. 2016-02. In March 2019, the FASB issued ASU No. 2019-01, Leases: Codification Improvements, which clarifies certain lessor accounting and interim reporting requirements. ASU No. 2016-02 and the subsequent amendments are effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted, and requires a modified retrospective transition approach with an option to either adjust or not adjust comparative periods. The Evergy Companies adopted the new guidance on January 1, 2019, without adjusting comparative periods for all leases existing as of January 1, 2019, by electing the optional transition method permitted by ASU No. 2018-11. As a result, Evergy, Evergy Kansas Central and Evergy Metro recorded an increase to assets and liabilities of approximately $110 million, $40 million and $80 million, respectively, as of January 1, 2019. Evergy Kansas Central and Evergy Metro have certain lease transactions between them for which the related assets and liabilities are eliminated at consolidated Evergy. The adoption of Topic 842 did not have a material impact on the Evergy Companies consolidated statements of income and comprehensive income and there was no cumulative-effect adjustment recorded to the opening balance of retained earnings. The Evergy Companies also elected a practical expedient to forgo reassessing existing or expired contracts as leases to determine whether each is in scope of Topic 842 and to forgo reassessing lease classification for existing and expired leases. Revenue Recognition In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU replaced most existing revenue recognition guidance in GAAP when it became effective. The Evergy Companies adopted ASU No. 2014-09 and its related amendments (Accounting Standards Codification (ASC) 606) on January 1, 2018, using the modified retrospective transition method for all contracts not completed as of the date of adoption. Results for reporting periods beginning after January 1, 2018, are presented under ASC 606 while historical periods have not been adjusted and continue to be reported in accordance with the legacy guidance in ASC 605 - Revenue Recognition. There was no cumulative effect adjustment to the opening balance of retained earnings in 2018 for the Evergy Companies as a result of the adoption of the new guidance.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Fuel Inventory and Supplies

The following table separately states the balances for fuel inventory and supplies.



	December 31
	2019		2018
Evergy	(millions)
Fuel inventory	$	146.4	$	168.9
Supplies	335.2		342.1
Fuel inventory and supplies	$	481.6	$	511.0
Evergy Kansas Central
Fuel inventory	$	80.2	$	87.8
Supplies	186.2		189.0
Fuel inventory and supplies	$	266.4	$	276.8
Evergy Metro
Fuel inventory	$	46.1	$	57.8
Supplies	116.9		119.8
Fuel inventory and supplies	$	163.0	$	177.6

Schedule of Allowance for Funds used During Construction

The amounts of the Evergy Companies' AFUDC for borrowed and equity funds are detailed in the following table.



	2019		2018		2017
Evergy	(millions)
AFUDC borrowed funds	$	14.5	$	10.4	$	5.6
AFUDC equity funds	2.2		3.1		2.0
Total	$	16.7	$	13.5	$	7.6
Evergy Kansas Central
AFUDC borrowed funds	$	7.5	$	6.6	$	5.6
AFUDC equity funds	—		2.9		2.0
Total	$	7.5	$	9.5	$	7.6
Evergy Metro^(a)
AFUDC borrowed funds	$	4.3	$	4.9	$	6.1
AFUDC equity funds	2.2		1.4		6.0
Total	$	6.5	$	6.3	$	12.1

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

The average rates used in the calculation of AFUDC are detailed in the following table.



	2019	2018	2017
Evergy Kansas Central	3.0%	3.3%	2.3%
Evergy Metro	4.6%	3.9%	4.9%
Evergy Missouri West	3.7%	2.9%	1.9%

Schedule pf Depreciable Lives of Property Plant and Equipment

The depreciable lives of Evergy's, Evergy Kansas Central's and Evergy Metro's property, plant and equipment are detailed in the following table.



	Evergy			Evergy Kansas Central				Evergy Metro
	(years)
Generating facilities	8	to	87		8	to	87	20	to	60
Transmission facilities	15	to	94		36	to	94	15	to	70
Distribution facilities	8	to	73		19	to	73	8	to	55
Other	5	to	84		7	to	84	5	to	50

Schedule of Cash Surrender Value of Corporate Owned Life Insurance

Substantially all of Evergy's COLI-related balances relate to Evergy Kansas Central's COLI activity.



	December 31
	2019			2018
Evergy	(millions)
Cash surrender value of policies	$	1,370.0		$	1,441.7
Borrowings against policies	(1,237.1		)	(1,306.9		)
Corporate-owned life insurance, net	$	132.9		$	134.8

Schedule of Other Income Expense

The table below shows the detail of other expense for each of the Evergy Companies.



	2019			2018			2017
Evergy	(millions)
Non-service cost component of net benefit cost	$	(55.6	)	$	(47.8	)	$	(20.0	)
Other	(21.3		)	(30.9		)	(19.1		)
Other expense	$	(76.9	)	$	(78.7	)	$	(39.1	)
Evergy Kansas Central
Non-service cost component of net benefit cost	$	(20.1	)	$	(23.5	)	$	(20.0	)
Other	(20.0		)	(23.3		)	(19.1		)
Other expense	$	(40.1	)	$	(46.8	)	$	(39.1	)
Evergy Metro^(a)
Non-service cost component of net benefit cost	$	(20.9	)	$	(25.9	)	$	(42.7	)
Other	(0.5		)	(5.0		)	(8.1		)
Other expense	$	(21.4	)	$	(30.9	)	$	(50.8	)

^(a)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Earnings Per Share, Basic and Diluted

The following table reconciles Evergy's basic and diluted EPS.



	2019		2018		2017
Income	(millions, except per share amounts)
Net income	$	685.6	$	546.0	$	336.5
Less: Net income attributable to noncontrolling interests	15.7		10.2		12.6
Net income attributable to Evergy, Inc.	$	669.9	$	535.8	$	323.9
Common Shares Outstanding
Weighted average number of common shares outstanding - basic	239.5		213.9		142.5
Add: effect of dilutive securities	0.4		0.2		0.1
Diluted average number of common shares outstanding	239.9		214.1		142.6
Basic EPS	$	2.80	$	2.50	$	2.27
Diluted EPS	$	2.79	$	2.50	$	2.27

Supplemental Cash Flow Information



Year Ended December 31	2019			2018			2017
Evergy	(millions)
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	$	329.5		$	255.9		$	153.9
Interest on financing activities of VIEs	1.6			2.3			3.1
Income taxes, net of refunds	(5.2		)	(0.9		)	(12.7		)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	186.0			(7.8		)	158.8
Deconsolidation of property, plant and equipment of VIE	—			—			(72.9		)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	(0.3		)	0.5			5.1
Deconsolidation of VIE	—			—			(83.1		)



Year Ended December 31	2019		2018			2017
Evergy Kansas Central	(millions)
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	$	143.0	$	155.3		$	153.9
Interest on financing activities of VIEs	1.6		2.3			3.1
Income taxes, net of refunds	29.9		37.5			(12.7		)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	92.1		(32.5		)	158.8
Deconsolidation of property, plant and equipment of VIE	—		—			(72.9		)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	—		—			5.1
Deconsolidation of VIE	—		—			(83.1		)



Year Ended December 31	2019		2018		2017
Evergy Metro^(a)	(millions)
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	$	118.4	$	129.4	$	128.0
Income taxes, net of refunds	77.0		31.2		38.8
Non-cash investing transactions:
Property, plant and equipment additions	80.7		19.2		36.6

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL (Tables)

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Schedule of Accounting Charges and Deferrals Related to Merger



Description	Income Statement Line Item	Expected Payment Period	Evergy			Evergy Kansas Central			Evergy Metro
			(millions)
One-time bill credits	Operating revenues	2018 - 2019	$	(59.7	)	$	(23.1	)	$	(22.4	)
Annual bill credits	Operating revenues	2019 - 2022	(10.5		)	(7.9		)	(2.6		)
Total impact to operating revenues			$	(70.2	)	$	(31.0	)	$	(25.0	)

Charitable contributions and community support	Operating and maintenance	2018 - 2027	$	24.7		$	—		$	—
Voluntary severance and accelerated equity compensation	Operating and maintenance	2018 - 2019	47.9			44.2			2.6
Other transaction and transition costs	Operating and maintenance	2018	51.0			21.5			2.1
Reallocation and deferral of merger transition costs	Operating and maintenance	n/a	(47.8		)	(13.8		)	(23.2		)
Total impact to operating and maintenance expense			$	75.8		$	51.9		$	(18.5	)
Total			$	(146.0	)	$	(82.9	)	$	(6.5	)

Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable

The total consideration transferred in the merger is based on the closing stock price of Evergy Kansas Central on June 4, 2018, and is calculated as follows.



	(millions, except share amounts)
Great Plains Energy common stock shares outstanding as of June 4, 2018	215,800,074
Great Plains Energy restricted stock awards outstanding as of June 4, 2018	(204,825		)
Great Plains Energy shares to be converted to Evergy shares	215,595,249
Exchange ratio	0.5981
Evergy common stock shares issued to Great Plains Energy shareholders	128,947,518
Closing price of Evergy Kansas Central common stock as of June 4, 2018	$	54.00
Fair value of Evergy shares issued to Great Plains Energy shareholders	$	6,963.2
Fair value of Great Plains Energy's equity compensation awards	12.5
Total purchase price	$	6,975.7

Schedule of Purchase Price Allocation

The final purchase price allocation to Great Plains Energy's assets and liabilities as of June 4, 2018, is detailed in the following table.



	(millions)
Current assets	$	2,151.7
Property, plant and equipment, net	9,179.7
Goodwill	2,336.6
Other long-term assets, excluding goodwill	1,235.9
Total assets	$	14,903.9
Current liabilities	1,673.9
Long-term liabilities, excluding long-term debt	2,895.7
Long-term debt, net	3,358.6
Total liabilities	$	7,928.2
Total purchase price	$	6,975.7

Schedule of Unaudited Pro Forma Financial Information



		2018		2017
	(millions, except per share amounts)
Operating revenues		$	5,334.6	$	5,279.2
Net income attributable to Evergy, Inc.		714.3		468.9
Basic earnings per common share		$	2.67	$	1.73
Diluted earnings per common share		$	2.67	$	1.73

REVENUE (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Evergy's, Evergy Kansas Central's and Evergy Metro's revenues disaggregated by customer class are summarized in the following tables.



Evergy	2019		2018
Revenues	(millions)
Residential	$	1,908.1	$	1,578.8
Commercial	1,781.6		1,356.4
Industrial	621.6		527.8
Other retail	47.1		30.6
Total electric retail	$	4,358.4	$	3,493.6
Wholesale	327.5		404.4
Transmission	309.2		308.1
Industrial steam and other	24.5		17.9
Total revenue from contracts with customers	$	5,019.6	$	4,224.0
Other	128.2		51.9
Operating revenues	$	5,147.8	$	4,275.9



Evergy Kansas Central	2019		2018
Revenues	(millions)
Residential	$	793.9	$	846.4
Commercial	709.1		702.8
Industrial	401.3		396.4
Other retail	21.0		20.0
Total electric retail	$	1,925.3	$	1,965.6
Wholesale	239.9		346.1
Transmission	273.3		288.9
Other	5.8		6.0
Total revenue from contracts with customers	$	2,444.3	$	2,606.6
Other	63.1		8.3
Operating revenues	$	2,507.4	$	2,614.9



Evergy Metro^(a)	2019		2018
Revenues	(millions)
Residential	$	712.4	$	735.6
Commercial	786.1		794.8
Industrial	136.9		138.8
Other retail	16.3		10.4
Total electric retail	$	1,651.7	$	1,679.6
Wholesale	70.9		53.5
Transmission	17.5		14.5
Other	2.8		4.4
Total revenue from contracts with customers	$	1,742.9	$	1,752.0
Other	63.6		71.1
Operating revenues	$	1,806.5	$	1,823.1

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

RECEIVABLES (Tables)

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Schedule of Receivables

The Evergy Companies' receivables are detailed in the following table.



	December 31
		2019			2018
Evergy		(millions)
Customer accounts receivable - billed		$	7.2		$	16.7
Customer accounts receivable - unbilled		104.0			91.2
Other receivables		127.8			95.0
Allowance for doubtful accounts		(10.5		)	(9.2		)
Total		$	228.5		$	193.7
Evergy Kansas Central
Customer accounts receivable - billed		$	—		$	—
Customer accounts receivable - unbilled		49.7			16.6
Other receivables		94.5			71.6
Allowance for doubtful accounts		(3.8		)	(3.9		)
Total		$	140.4		$	84.3
Evergy Metro
Customer accounts receivable - billed		$	3.1		$	7.8
Customer accounts receivable - unbilled		26.5			42.9
Other receivables		23.1			15.8
Allowance for doubtful accounts		(4.6		)	(3.8		)
Total		$	48.1		$	62.7

Summary of Bad Debt Expense

The Evergy Companies recorded bad debt expense related to contracts with customers as summarized in the following table.



	2019		2018		2017
	(millions)
Evergy	$	27.3	$	20.2	$	10.3
Evergy Kansas Central	7.3		8.5		10.3
Evergy Metro ^(a)	13.7		13.1		7.6

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

RATE MATTERS AND REGULATION (Tables)

12 Months Ended

Dec. 31, 2019

Regulated Operations [Abstract]

Schedule of Regulatory Assets

The Evergy Companies' regulatory assets and liabilities are detailed in the following tables.



	December 31
	2019									2018
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Regulatory Assets	(millions)
Pension and post-retirement costs	$	795.9		$	359.9		$	330.7		$	808.2		$	343.7		$	361.5
Debt reacquisition costs	105.8			97.3			7.5			113.5			104.1			8.2
Debt fair value adjustment	112.0			—			—			134.5			—			—
Asset retirement obligations fair value adjustment	114.3			—			—			111.4			—			—
Depreciation	55.3			55.3			—			58.0			58.0			—
Cost of removal	129.3			94.4			34.9			102.4			65.7			36.7
Asset retirement obligations	167.1			52.8			79.4			171.9			49.5			91.6
Analog meter unrecovered investment	29.9			29.9			—			35.6			35.6			—
Treasury yield hedges	22.6			22.6			—			23.7			23.7			—
Iatan No. 1 and common facilities	7.1			—			2.8			7.4			—			2.9
Iatan No. 2 construction accounting costs	26.1			—			13.1			26.8			—			13.5
Kansas property tax surcharge	21.7			18.7			3.0			33.1			23.7			9.4
Disallowed plant costs	14.8			14.8			—			15.0			15.0			—
La Cygne environmental costs	13.7			11.2			2.5			14.8			12.2			2.6
Deferred customer programs	18.0			6.2			8.3			19.9			7.0			8.0
Fuel recovery mechanisms	34.7			—			16.6			91.2			7.1			41.7
Solar rebates	39.8			—			9.0			45.2			—			13.9
Transmission delivery charge	—			—			—			0.8			—			0.8
Wolf Creek outage	31.0			15.5			15.5			21.8			10.9			10.9
Pension and other post-retirement benefit non-service costs	31.8			7.4			15.6			13.6			5.2			4.8
Retired generation facilities	130.5			—			—			159.9			—			—
Merger transition costs	42.3			20.3			15.6			47.0			22.6			17.3
Other regulatory assets	28.5			17.4			5.3			6.1			13.5			2.3
Total	1,972.2			823.7			559.8			2,061.8			797.5			626.1
Less: current portion	(231.7		)	(93.3		)	(95.4		)	(303.9		)	(97.1		)	(130.9		)
Total noncurrent regulatory assets	$	1,740.5		$	730.4		$	464.4		$	1,757.9		$	700.4		$	495.2

Schedule of Regulatory Liabilities



	December 31
	2019									2018
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Regulatory Liabilities	(millions)
Taxes refundable through future rates	$	1,656.5		$	856.4		$	568.9		$	1,703.6		$	853.2		$	609.2
Deferred regulatory gain from sale leaseback	53.6			53.6			—			59.1			59.1			—
Emission allowances	50.1			—			50.1			54.1			—			54.1
Nuclear decommissioning	267.3			116.5			150.8			188.2			84.5			103.7
Pension and post-retirement costs	59.3			31.5			20.3			53.4			28.3			25.1
Jurisdictional allowance for funds used during construction	28.7			28.7			—			30.3			30.3			—
La Cygne leasehold dismantling costs	29.6			29.6			—			29.5			29.5			—
Cost of removal	49.1			—			—			48.1			—			—
Kansas tax credits	17.0			17.0			—			16.5			16.5			—
Purchase power agreement	7.4			7.4			—			8.8			8.8			—
Merger customer credits	—			—			—			7.5			—			7.5
Fuel recovery mechanisms	34.1			30.2			—			—			—			—
Sibley AAO	10.2			—			—			—			—			—
Refund of tax reform benefits	—			—			—			70.9			7.2			36.3
Other regulatory liabilities	48.7			3.9			13.5			59.0			3.9			11.2
Total	2,311.6			1,174.8			803.6			2,329.0			1,121.3			847.1
Less: current portion	(63.3		)	(42.3		)	(11.4		)	(110.2		)	(19.5		)	(52.8		)
Total noncurrent regulatory liabilities	$	2,248.3		$	1,132.5		$	792.2		$	2,218.8		$	1,101.8		$	794.3

ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2019

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table summarizes the change in the Evergy Companies' AROs.



	Evergy						Evergy Kansas Central						Evergy Metro^(a)
	2019			2018			2019			2018			2019			2018
	(millions)
Beginning balance	$	687.1		$	405.1		$	281.1		$	405.1		$	261.0		$	266.3
Liabilities assumed upon merger with Great Plains Energy	—			412.2			—			—			—			—
Liabilities incurred during the year	—			7.4			—			7.4			—			—
Revision in timing and/or estimates	(22.3		)	(150.1		)	(12.4		)	(138.7		)	(9.9		)	(11.4		)
Settlements	(17.8		)	(22.4		)	(14.8		)	(12.0		)	(2.5		)	(13.1		)
Accretion	27.1			34.9			19.0			19.3			5.0			19.2
Ending balance	$	674.1		$	687.1		$	272.9		$	281.1		$	253.6		$	261.0
Less: current portion	(71.3		)	(49.8		)	(23.3		)	(17.1		)	(36.1		)	(29.2		)
Total noncurrent asset retirement obligation	$	602.8		$	637.3		$	249.6		$	264.0		$	217.5		$	231.8

^(a)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of Public Utility Property, Plant, and Equipment

The following tables summarize the property, plant and equipment of Evergy, Evergy Kansas Central and Evergy Metro.



December 31, 2019	Evergy				Evergy Kansas Central				Evergy Metro
		(millions)
Electric plant in service		$	27,768.8			$	13,538.1			$	10,776.5
Electric plant acquisition adjustment		740.6				740.6				—
Accumulated depreciation		(10,293.7		)		(4,951.5		)		(4,272.0		)
Plant in service		18,215.7				9,327.2				6,504.5
Construction work in progress		839.2				472.8				269.9
Nuclear fuel, net		128.5				63.9				64.6
Plant to be retired, net ^(a)		1.0				1.0				—
Net property, plant and equipment		$	19,184.4			$	9,864.9			$	6,839.0

December 31, 2018	Evergy				Evergy Kansas Central				Evergy Metro
		(millions)
Electric plant in service		$	26,916.7			$	13,176.7			$	10,439.1
Electric plant acquisition adjustment		740.6				740.6				—
Accumulated depreciation		(9,694.1		)		(4,642.8		)		(4,022.4		)
Plant in service		17,963.2				9,274.5				6,416.7
Construction work in progress		685.2				376.7				204.4
Nuclear fuel, net		133.1				66.1				67.0
Plant to be retired, net ^(a)		1.0				1.0				—
Net property, plant and equipment		$	18,782.5			$	9,718.3			$	6,688.1

^(a) As of December 31, 2019 and 2018, represents the planned retirement of Evergy Kansas Central analog meters prior to the end of their remaining useful lives.

The following table summarizes the property, plant and equipment of VIEs for Evergy and Evergy Kansas Central.



		December 31
	2019				2018
		(millions)
Electric plant of VIEs		$	392.1			$	392.1
Accumulated depreciation of VIEs		(230.1		)		(222.9		)
Net property, plant and equipment of VIEs		$	162.0			$	169.2

The Evergy Companies' depreciation expense is detailed in the following table.



		2019		2018		2017
	(millions)
Evergy ^(a)		$	786.3	$	567.9	$	350.0
Evergy Kansas Central ^(a)		425.8		371.3		350.0
Evergy Metro^(b)		262.7		235.3		228.4

^(a)Approximately $7.1 million, $7.1 million and $8.3 million of depreciation expense in 2019, 2018 and 2017, respectively, was attributable to property, plant and equipment of VIEs.

^(b)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

JOINTLY-OWNED ELECTRIC UTILITY PLANTS (Tables)

12 Months Ended

Dec. 31, 2019

Jointly Owned Electric Utility Plants [Abstract]

Schedule of Jointly Owned Utility Plants

Evergy's, Evergy Kansas Central's and Evergy Metro's share of jointly-owned electric utility plants at December 31, 2019, are detailed in the following tables.



Evergy
	Wolf Creek Unit			La Cygne Units^(a)			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common			Jeffrey Energy Center			State Line
	(millions, except MW amounts)
Evergy's share		94%			100%			88%			73%			79%			100%			40%

Utility plant in service		$	3,827.8		$	2,202.4		$	718.9		$	1,379.7		$	484.3		$	2,428.6		$	114.6
Accumulated depreciation		1,835.3			751.6			269.2			447.2			116.4			918.1			75.9
Nuclear fuel, net		128.6			—			—			—			—			—			—
Construction work in progress		141.4			21.0			54.4			23.5			9.4			38.9			2.8
2020 accredited capacity-MWs		1,104			1,398			616			650			NA			2,186			196


^(a)	The VIE consolidated by Evergy and Evergy Kansas Central holds its 50% leasehold interest in La Cygne Unit 2. This 50% leasehold interest in La Cygne Unit 2 is reflected in the information provided above. See Note 19 for additional information.



Evergy Kansas Central
	Wolf Creek Unit			La Cygne Units^(a)			Jeffrey Energy Center		State Line
	(millions, except MW amounts)
Evergy Kansas Central's share		47%			50%		92%			40%

Utility plant in service		$	1,884.5		$	1,048.0	$	2,223.4		$	114.6
Accumulated depreciation		862.2			426.5		832.5			75.9
Nuclear fuel, net		63.9			—		—			—
Construction work in progress		67.3			14.6		34.9			2.8
2020 accredited capacity-MWs		552			699		2,011			196


^(a)	The VIE consolidated by Evergy and Evergy Kansas Central holds its 50% leasehold interest in La Cygne Unit 2. This 50% leasehold interest in La Cygne Unit 2 is reflected in the information provided above. See Note 19 for additional information.



Evergy Metro
	Wolf Creek Unit			La Cygne Units			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common
	(millions, except MW amounts)
Evergy Metro's share		47%			50%			70%			55%			61%

Utility plant in service		$	1,943.3		$	1,154.4		$	575.1		$	1,060.7		$	390.1
Accumulated depreciation		973.1			325.1			214.9			393.0			99.8
Nuclear fuel, net		64.7			—			—			—			—
Construction work in progress		74.1			6.4			25.9			3.5			1.3
2020 accredited capacity-MWs		552			699			490			491			NA

PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)

12 Months Ended

Dec. 31, 2019

Retirement Benefits [Abstract]

Schedule of Net Funded Status

Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2019	$	2,553.4		$	1,258.9		$	1,272.4		$	249.3		$	133.6		$	115.7
Service cost	79.1			29.0			50.1			2.5			1.1			1.4
Interest cost	108.0			53.7			53.3			10.5			5.6			4.9
Contribution by participants	—			—			—			8.8			1.9			6.9
Actuarial loss	262.4			120.3			140.5			20.9			9.5			11.4
Benefits paid	(180.5		)	(136.9		)	(42.3		)	(27.7		)	(13.0		)	(14.7		)
Settlements	(96.6		)	—			(96.6		)	—			—			—
Other	(7.6		)	(1.6		)	(6.0		)	—			—			—
PBO at December 31, 2019	$	2,718.2		$	1,323.4		$	1,371.4		$	264.3		$	138.7		$	125.6
Change in plan assets
Fair value of plan assets at January 1, 2019	$	1,603.4		$	804.6		$	798.8		$	223.3		$	109.7		$	113.6
Actual return on plan assets	284.0			130.5			153.5			30.0			20.0			10.0
Contributions by employer and participants	125.2			43.0			82.2			13.2			3.5			9.7
Benefits paid	(175.6		)	(134.4		)	(41.2		)	(26.6		)	(12.7		)	(13.9		)
Settlements	(96.6		)	—			(96.6		)	—			—			—
Other	(7.6		)	(1.6		)	(6.0		)	—			—			—
Fair value of plan assets at December 31, 2019	$	1,732.8		$	842.1		$	890.7		$	239.9		$	120.5		$	119.4
Funded status at December 31, 2019	$	(985.4	)	$	(481.3	)	$	(480.7	)	$	(24.4	)	$	(18.2	)	$	(6.2	)



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2018	$	1,367.0		$	1,367.0		$	1,331.7		$	138.6		$	138.6		$	133.2
Service cost	60.7			32.2			48.6			2.3			1.3			2.0
Interest cost	82.5			50.7			49.9			8.0			5.0			4.8
Contribution by participants	—			—			—			5.6			1.8			6.6
Plan amendments	13.4			11.4			2.0			—			—			—
Actuarial gain	(98.8		)	(100.1		)	(89.6		)	(11.3		)	(2.6		)	(18.0		)
Benefits paid	(137.9		)	(97.9		)	(70.2		)	(17.3		)	(10.5		)	(12.9		)
Obligations assumed upon merger with Great Plains Energy	1,275.9			—			—			123.4			—			—
Other	(9.4		)	(4.4		)	—			—			—			—
PBO at December 31, 2018	$	2,553.4		$	1,258.9		$	1,272.4		$	249.3		$	133.6		$	115.7
Change in plan assets
Fair value of plan assets at January 1, 2018	$	887.0		$	887.0		$	848.4		$	124.1		$	124.1		$	115.8
Actual return on plan assets	(79.7		)	(30.9		)	(60.1		)	(7.5		)	(7.4		)	(1.2		)
Contributions by employer and participants	114.5			47.9			80.3			11.6			3.2			11.4
Benefits paid	(134.0		)	(95.0		)	(69.8		)	(16.7		)	(10.2		)	(12.4		)
Assets acquired upon merger with Great Plains Energy	825.0			—			—			111.8			—			—
Other	(9.4		)	(4.4		)	—			—			—			—
Fair value of plan assets at December 31, 2018	$	1,603.4		$	804.6		$	798.8		$	223.3		$	109.7		$	113.6
Funded status at December 31, 2018	$	(950.0	)	$	(454.3	)	$	(473.6	)	$	(26.0	)	$	(23.9	)	$	(2.1	)

Schedule of Amounts Recognized in Balance Sheet



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Amounts recognized in the consolidated balance sheets	(millions)
Non-current asset	$	—		$	—		$	—		$	15.0		$	—		$	15.0
Current pension and other post-retirement liability	(5.6		)	(3.0		)	(1.3		)	(1.9		)	(1.0		)	(0.9		)
Noncurrent pension liability and other post-retirement liability	(979.8		)	(478.3		)	(479.4		)	(37.5		)	(17.2		)	(20.3		)
Net amount recognized before regulatory treatment	(985.4		)	(481.3		)	(480.7		)	(24.4		)	(18.2		)	(6.2		)
Accumulated OCI or regulatory asset/liability	454.1			354.9			192.3			(4.4		)	(2.9		)	(13.0		)
Net amount recognized at December 31, 2019	$	(531.3	)	$	(126.4	)	$	(288.4	)	$	(28.8	)	$	(21.1	)	$	(19.2	)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	439.7		$	342.3		$	189.4		$	(5.7	)	$	(4.2	)	$	(4.9	)
Prior service cost	14.4			12.6			2.9			1.3			1.3			(8.1		)
Net amount recognized at December 31, 2019	$	454.1		$	354.9		$	192.3		$	(4.4	)	$	(2.9	)	$	(13.0	)



	Pension Benefits									Post-Retirement Benefits
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Amounts recognized in the consolidated balance sheets	(millions)
Non-current asset	$	—		$	—		$	—		$	17.5		$	—		$	17.5
Current pension and other post-retirement liability	(4.4		)	(2.6		)	(0.5		)	(1.7		)	(0.9		)	(0.8		)
Noncurrent pension liability and other post- retirement liability	(945.6		)	(451.7		)	(473.1		)	(41.8		)	(23.0		)	(18.8		)
Net amount recognized before regulatory treatment	(950.0		)	(454.3		)	(473.6		)	(26.0		)	(23.9		)	(2.1		)
Accumulated OCI or regulatory asset/liability	419.9			337.5			230.1			(6.0		)	0.8			(19.1		)
Net amount recognized at December 31, 2018	$	(530.1	)	$	(116.8	)	$	(243.5	)	$	(32.0	)	$	(23.1	)	$	(21.2	)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	403.6		$	323.2		$	226.3		$	(7.8	)	$	(1.0	)	$	(11.0	)
Prior service cost	16.3			14.3			3.8			1.8			1.8			(8.1		)
Net amount recognized at December 31, 2018	$	419.9		$	337.5		$	230.1		$	(6.0	)	$	0.8		$	(19.1	)

Schedule of Net Benefit Costs

The assets in the aforementioned trusts are not included in the table above. See Note 14 for more information on these amounts.



	Pension Benefits									Post-Retirement Benefits
Year Ended December 31, 2019	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	79.1		$	29.0		$	50.1		$	2.5		$	1.1		$	1.4
Interest cost	108.0			53.7			53.3			10.5			5.6			4.9
Expected return on plan assets	(106.3		)	(54.8		)	(48.9		)	(10.0		)	(6.7		)	(3.3		)
Prior service cost	1.9			1.7			0.9			0.5			0.5			—
Recognized net actuarial (gain) loss	33.0			25.5			49.8			(1.2		)	(0.6		)	(1.4		)
Settlement and special termination benefits	15.6			—			23.0			—			—			—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	131.3			55.1			128.2			2.3			(0.1		)	1.6
Regulatory adjustment	37.4			3.0			(19.2		)	(3.4		)	(3.0		)	0.4
Intercompany allocations	n/a			—			(34.4		)	n/a			—			(0.4		)
Net periodic benefit costs	168.7			58.1			74.6			(1.1		)	(3.1		)	1.6
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	84.7			44.6			35.9			0.9			(3.8		)	4.7
Amortization of gain (loss)	(48.6		)	(25.5		)	(72.8		)	1.2			0.6			1.4
Amortization of prior service cost	(1.9		)	(1.7		)	(0.9		)	(0.5		)	(0.5		)	—
Total recognized in OCI or regulatory asset/liability	34.2			17.4			(37.8		)	1.6			(3.7		)	6.1
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	202.9		$	75.5		$	36.8		$	0.5		$	(6.8	)	$	7.7



	Pension Benefits									Post-Retirement Benefits
Year Ended December 31, 2018	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	60.7		$	32.2		$	48.6		$	2.3		$	1.3		$	2.0
Interest cost	82.5			50.7			49.9			8.0			5.0			4.8
Expected return on plan assets	(86.4		)	(55.9		)	(55.5		)	(8.8		)	(7.0		)	(2.8		)
Prior service cost	0.7			0.7			0.7			0.5			0.5			0.1
Recognized net actuarial (gain) loss	32.6			32.6			45.1			(0.6		)	(0.6		)	(0.2		)
Net periodic benefit costs before regulatory adjustment and intercompany allocations	90.1			60.3			88.8			1.4			(0.8		)	3.9
Regulatory adjustment	8.3			8.8			0.7			(1.7		)	(2.0		)	(0.1		)
Intercompany allocations	n/a			—			(21.6		)	n/a			—			(1.1		)
Net periodic benefit costs	98.4			69.1			67.9			(0.3		)	(2.8		)	2.7
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	67.2			(13.2		)	25.9			4.9			11.7			(14.0		)
Amortization of gain (loss)	(32.6		)	(32.6		)	(45.1		)	0.6			0.6			0.2
Prior service cost	13.4			11.4			2.0			—			—			—
Amortization of prior service cost	(0.7		)	(0.7		)	(0.7		)	(0.5		)	(0.5		)	(0.1		)
Total recognized in OCI or regulatory asset/liability	47.3			(35.1		)	(17.9		)	5.0			11.8			(13.9		)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	145.7		$	34.0		$	50.0		$	4.7		$	9.0		$	(11.2	)



	Pension Benefits									Post-Retirement Benefits
Year Ended December 31, 2017	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	28.7		$	28.7		$	44.2		$	1.2		$	1.2		$	2.1
Interest cost	52.4			52.4			52.6			5.5			5.5			5.4
Expected return on plan assets	(53.6		)	(53.6		)	(51.2		)	(6.9		)	(6.9		)	(2.5		)
Prior service cost	0.7			0.7			0.7			0.5			0.5			—
Recognized net actuarial (gain) loss	26.9			26.9			49.0			(0.8		)	(0.8		)	(0.5		)
Settlement and special termination benefits	0.4			0.4			16.3			—			—			—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	55.5			55.5			111.6			(0.5		)	(0.5		)	4.5
Regulatory adjustment	14.5			14.5			(9.2		)	(1.9		)	(1.9		)	1.3
Intercompany allocations	n/a			—			(37.1		)	n/a			—			(1.5		)
Net periodic benefit costs	70.0			70.0			65.3			(2.4		)	(2.4		)	4.3
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	47.1			47.1			71.3			(5.8		)	(5.8		)	3.0
Amortization of gain (loss)	(26.9		)	(26.9		)	(64.9		)	0.8			0.8			0.5
Amortization of prior service cost	(0.7		)	(0.7		)	(0.7		)	(0.5		)	(0.5		)	—
Total recognized in OCI or regulatory asset/liability	19.5			19.5			5.7			(5.5		)	(5.5		)	3.5
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	89.5		$	89.5		$	71.0		$	(7.9	)	$	(7.9	)	$	7.8

Schedule of Estimated Amounts to be Amortized in 2020

The estimated amounts to be amortized in 2020 are detailed in the following table.



	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
Actuarial (gain) loss amortization	$	45.4	$	33.9	$	45.1	$	0.2	$	—	$	(0.6	)
Prior service cost amortization	1.8		1.6		0.8		0.5		0.5		—

Schedule of Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets



December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,390.5	$	1,196.8	$	1,170.2
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,718.2	$	1,323.4	$	1,371.4
Fair value of plan assets	1,732.8		842.1		890.7
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,390.5	$	1,196.8	$	1,170.2
Fair value of plan assets	1,732.8		842.1		890.7
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	264.3	$	138.7	$	125.6
Fair value of plan assets	239.9		120.5		119.4



December 31, 2018	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,257.9	$	1,139.1	$	1,096.7
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,553.4	$	1,258.9	$	1,272.4
Fair value of plan assets	1,603.4		804.6		798.8
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,257.9	$	1,139.1	$	1,096.7
Fair value of plan assets	1,603.4		804.6		798.8
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	249.3	$	133.6	$	57.7
Fair value of plan assets	223.3		109.7		38.2

Schedule of Defined Benefit Plan, Assumptions

The following tables provide the weighted-average assumptions used to determine benefit obligations and net costs.



Weighted-average assumptions used to determine the benefit obligation at December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.62	%	3.61	%	3.64	%	3.56	%	3.54	%	3.58	%
Rate of compensation increase	3.74	%	3.78	%	3.71	%	3.75	%	n/a		3.75	%

Weighted-average assumptions used to determine the benefit obligation at December 31, 2018	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	4.35	%	4.35	%	4.36	%	4.33	%	4.33	%	4.33	%
Rate of compensation increase	3.76	%	4.03	%	3.64	%	3.50	%	n/a		3.50	%



Weighted-average assumptions used to determine net costs for the year ended December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	4.35	%	4.35	%	4.36	%	4.33	%	4.33	%	4.33	%
Expected long-term return on plan assets	6.61	%	6.75	%	6.47	%	4.44	%	6.00	%	2.94	%
Rate of compensation increase	3.76	%	4.03	%	3.64	%	3.50	%	n/a		3.50	%

Weighted-average assumptions used to determine net costs for the year ended December 31, 2018	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.73	%	3.73	%	3.72	%	3.67	%	3.73	%	3.64	%
Expected long-term return on plan assets	6.52	%	6.67	%	6.46	%	6.00	%	6.00	%	2.80	%
Rate of compensation increase	3.92	%	4.00	%	3.62	%	3.50	%	n/a		3.50	%

Schedule of Expected Benefit Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid through 2029.



	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2020	$	180.6	$	95.1	$	84.3	$	16.7	$	9.6	$	7.1
2021	182.4		95.6		85.5		16.7		9.5		7.2
2022	181.1		93.3		86.5		16.4		9.3		7.1
2023	181.8		91.5		89.0		16.3		9.2		7.1
2024	185.0		91.9		91.7		15.9		8.8		7.1
2025-2029	918.2		428.3		482.3		75.2		40.3		34.9

Schedule of Allocation of Plan Assets

The following table provides the target asset allocations by asset class for the Evergy Kansas Central and Evergy Metro pension and other post-retirement plan assets.



	Pension Benefits				Post-Retirement Benefits
	Evergy Kansas Central		Evergy Metro		Evergy Kansas Central		Evergy Metro
Domestic equities	29	%	31	%	33	%	3	%
International equities	20	%	21	%	22	%	—	%
Bonds	36	%	35	%	45	%	85	%
Mortgage & asset backed securities	—	%	—	%	—	%	4	%
Real estate investments	4	%	6	%	—	%	—	%
Other investments	11	%	7	%	—	%	8	%

The fair values of the Evergy Companies' pension plan assets at December 31, 2019 and 2018, by asset category are in the following tables.



				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	233.8		$	150.6		$	—		$	—		$	83.2
International equities		162.4			101.5			—			—			60.9
Bond funds		281.7			233.0			—			—			48.7
Real estate investments		46.5			—			—			—			46.5
Combination debt/equity/other fund		30.1			30.1			—			—			—
Alternative investment funds		78.5			—			—			—			78.5
Short-term investments		9.1			—			—			—			9.1
Total		$	842.1		$	515.2		$	—		$	—		$	326.9

Evergy Metro Pension Plans
Domestic equities		$	244.8		$	195.3		$	—		$	—		$	49.5
International equities		178.7			117.7			—			—			61.0
Bond funds		71.0			15.6			—			—			55.4
Corporate bonds		123.9			—			123.9			—			—
U.S. Treasury and agency bonds		70.9			53.5			17.4			—			—
Mortgage and asset backed securities		5.7			—			5.7			—			—
Real estate investments		50.8			12.8			—			—			38.0
Combination debt/equity/other fund		11.9			11.9			—			—			—
Alternative investment funds		36.6			—			—			—			36.6
Cash and cash equivalents		92.9			92.9			—			—			—
Short-term investments		1.0			—			—			—			1.0
Other		2.5			—			2.5			—			—
Total		$	890.7		$	499.7		$	149.5		$	—		$	241.5



				Fair Value Measurements Using
Description	December 31 2018			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	215.0		$	144.7		$	—		$	—		$	70.3
International equities		138.7			91.8			—			—			46.9
Bond funds		296.4			255.4			—			—			41.0
Real estate investments		44.8			—			—			—			44.8
Combination debt/equity/other fund		30.1			30.1			—			—			—
Alternative investment funds		73.6			—			—			—			73.6
Short-term investments		6.0			—			—			—			6.0
Total		$	804.6		$	522.0		$	—		$	—		$	282.6

Evergy Metro Pension Plans
Domestic equities		$	238.1		$	198.6		$	—		$	—		$	39.5
International equities		150.9			104.0			—			—			46.9
Bond funds		67.4			19.3			—			—			48.1
Corporate bonds		123.6			—			123.6			—			—
U.S. Treasury and agency bonds		69.9			52.4			17.5			—			—
Mortgage and asset backed securities		5.5			—			5.5			—			—
Real estate investments		48.2			12.6			—			—			35.6
Combination debt/equity/other fund		13.5			13.5			—			—			—
Alternative investment funds		31.6			—			—			—			31.6
Cash and cash equivalents		49.8			49.8			—			—			—
Other		0.3			—			0.3			—			—
Total		$	798.8		$	450.2		$	146.9		$	—		$	201.7

The fair values of the Evergy Companies' post-retirement plan assets at December 31, 2019 and 2018, by asset category are in the following tables.



				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	40.5		$	—		$	—		$	—		$	40.5
International equities		26.0			—			—			—			26.0
Bond funds		52.9			—			—			—			52.9
Cash and cash equivalents		1.1			1.1			—			—			—
Total		$	120.5		$	1.1		$	—		$	—		$	119.4

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	3.2		$	3.2		$	—		$	—		$	—
International equities		1.1			1.1			—			—			—
Bond funds		77.5			0.1			—			—			77.4
Corporate bonds		17.8			—			17.8			—			—
U.S. Treasury and agency bonds		11.5			4.1			7.4			—			—
Mortgage and asset backed securities		1.3			—			1.3			—			—
Cash and cash equivalents		6.7			6.7			—			—			—
Other		0.3			—			0.3			—			—
Total		$	119.4		$	15.2		$	26.8		$	—		$	77.4



				Fair Value Measurements Using
Description	December 31 2018			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	56.4		$	—		$	—		$	—		$	56.4
International equities		14.0			—			—			—			14.0
Bond funds		38.4			—			—			—			38.4
Short-term investments		0.7			—			—			—			0.7
Cash and cash equivalents		0.2			0.2			—			—			—
Total		$	109.7		$	0.2		$	—		$	—		$	109.5

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	2.5		$	2.5		$	—		$	—		$	—
International equities		0.9			0.9			—			—			—
Bond funds		75.0			0.2			—			—			74.8
Corporate bonds		17.4			—			17.4			—			—
U.S. Treasury and agency bonds		10.3			2.6			7.7			—			—
Mortgage and asset backed securities		2.5			—			2.5			—			—
Cash and cash equivalents		4.7			4.7			—			—			—
Other		0.3			—			0.3			—			—
Total		$	113.6		$	10.9		$	27.9		$	—		$	74.8

Schedule of Health Care Cost Trend Rates

The cost trend assumptions are detailed in the following tables.



Assumed annual health care cost growth rates as of December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.3	%	6.3	%	6.3	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

Assumed annual health care cost growth rates as of December 31, 2018	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.5	%	6.5	%	6.5	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

The effects of a one-percentage point change in the assumed health care cost trend rates, holding all other assumptions constant, at December 31, 2019, are detailed in the following table.



	Evergy			Evergy Kansas Central^(a)			Evergy Metro
Effect of 1% increase	(millions)
Effect on total service and interest component	$	—		$	—		$	—
Effect on post-retirement benefit obligation	0.5			(0.1		)	0.6
Effect of 1% decrease
Effect on total service and interest component	$	—		$	—		$	—
Effect on post-retirement benefit obligation	(0.4		)	0.1			(0.5		)

Schedule of Costs of Retirement Plans



	2019		2018		2017
	(millions)
Evergy	$	17.6	$	16.3	$	9.7
Evergy Kansas Central	9.6		9.9		9.7
Evergy Metro	8.0		8.3		7.7

EQUITY COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Equity Compensation Expense and Associated Income Tax Benefits

The following table summarizes the Evergy Companies' equity compensation expense and the associated income tax benefit.



	2019		2018		2017
Evergy	(millions)
Equity compensation expense	$	15.5	$	30.7	$	8.9
Income tax benefit	3.0		1.4		3.5
Evergy Kansas Central
Equity compensation expense	6.7		24.8		8.9
Income tax benefit	1.9		1.4		3.5
Evergy Metro^(a)
Equity compensation expense	5.7		6.5		4.2
Income tax benefit	0.3		0.1		1.6

^(a)Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Restricted Stock Unit Activity

RSU activity for awards with performance measures for 2019 is summarized in the following table.



	Nonvested Restricted Share Units			Grant Date Fair Value*
Beginning balance January 1, 2019		—			$	—
Granted		202,107			37.87
Forfeited		(4,857	)		37.87
Ending balance December 31, 2019		197,250			37.87

* weighted-average

RSU activity for awards with only service requirements for 2019 is summarized in the following table.



	Nonvested Restricted Share Units			Grant Date Fair Value*
Beginning balance January 1, 2019		217,256			$	54.07
Granted		70,395			54.47
Vested		(48,767	)		54.20
Forfeited		(5,534	)		54.23
Ending balance December 31, 2019		233,350			54.16

* weighted-average

Schedule of Performance Share Activity



	Performance Shares			Grant Date Fair Value*
Beginning balance January 1, 2019		348,496			$	63.80
Vested		(69,317	)		46.11
Forfeited		(6,481	)		69.65
Performance adjustment		(44,442	)		42.97
Ending balance December 31, 2019		228,256			73.06

* weighted-average

Schedule of Restricted Stock Activity

Restricted stock activity for 2019 is summarized in the following table.



	Nonvested Restricted Stock			Grant Date Fair Value*
Beginning balance January 1, 2019		116,675			$	54.03
Vested		(38,404	)		54.35
Forfeited		(2,161	)		53.88
Ending balance December 31, 2019		76,110			53.87

* weighted-average

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of Short-term Debt

The following table summarizes the committed credit facilities (excluding receivable sale facilities discussed in Note 4) available to the Evergy Companies as of December 31, 2019 and 2018.



			Amounts Drawn
	Credit Facility		Commercial Paper		Letters of Credit		Cash Borrowings		Available Borrowings		Weighted Average Interest Rate on Short-Term Borrowings
December 31, 2019	(millions)
Evergy, Inc.	$	450.0	n/a		$	0.7	$	20.0	$	429.3	2.99%
Evergy Kansas Central	1,000.0		249.2		14.2		—		736.6		2.07%
Evergy Metro	600.0		199.3		—		—		400.7		2.02%
Evergy Missouri West	450.0		93.4		2.1		—		354.5		2.02%
Evergy	$	2,500.0	$	541.9	$	17.0	$	20.0	$	1,921.1

December 31, 2018
Evergy, Inc.	$	450.0	n/a		$	1.0	$	—	$	449.0	—%
Evergy Kansas Central	1,000.0		411.7		18.3		—		570.0		3.08%
Evergy Metro	600.0		176.9		2.7		—		420.4		2.95%
Evergy Missouri West	450.0		150.0		2.1		—		297.9		3.00%
Evergy	$	2,500.0	$	738.6	$	24.1	$	—	$	1,737.3

LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of Debt

The Evergy Companies' long-term debt is detailed in the following tables.



December 31, 2019	Issuing Entity	Year Due	Evergy			Evergy Kansas Central			Evergy Metro
Mortgage Bonds			(millions)
5.10% Series	Evergy Kansas Central, Inc.	2020	$	250.0		$	250.0		$	—
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0			250.0			—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0			350.0			—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0			300.0			—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0			550.0			—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0			430.0			—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0			250.0			—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0			300.0			—
3.25% Series	Evergy Kansas Central, Inc.	2049	300.0			300.0
6.15% Series	Evergy Kansas South, Inc.	2023	50.0			50.0			—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0			175.0			—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0			100.0			—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0			250.0			—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5			—			79.5
4.125% Series	Evergy Metro, Inc.	2049	400.0			—			400.0
9.44% Series	Evergy Missouri West, Inc.	2020-2021	2.3			—			—
Pollution Control Bonds
1.39% Series^(b)	Evergy Kansas Central, Inc.	2032	45.0			45.0			—
1.39% Series^(b)	Evergy Kansas Central, Inc.	2032	30.5			30.5			—
1.39% Series^(b)	Evergy Kansas South, Inc.	2027	21.9			21.9			—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0			50.0			—
1.39% Series^(b)	Evergy Kansas South, Inc.	2032	14.5			14.5			—
1.39% Series^(b)	Evergy Kansas South, Inc.	2032	10.0			10.0			—
1.432% Series 2007A and 2007B^(b)	Evergy Metro, Inc.	2035	146.5			—			146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4			—			23.4
Senior Notes
3.15% Series^(g)	Evergy Metro, Inc.	2023	300.0			—			300.0
3.65% Series^(g)	Evergy Metro, Inc.	2025	350.0			—			350.0
6.05% Series (5.78% rate)^(a)(g)	Evergy Metro, Inc.	2035	250.0			—			250.0
5.30% Series^(g)	Evergy Metro, Inc.	2041	400.0			—			400.0
4.20% Series^(g)	Evergy Metro, Inc.	2047	300.0			—			300.0
4.20% Series^(g)	Evergy Metro, Inc.	2048	300.0			—			300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9			—			—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0			—			—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0			—			—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0			—			—
3.74% Series	Evergy Missouri West, Inc.	2022	100.0			—			—
4.85% Series	Evergy, Inc.^(f)	2021	350.0			—			—
5.292% Series	Evergy, Inc.^(f)	2022	287.5			—			—
2.45% Series	Evergy, Inc.	2024	800.0			—			—
2.90% Series (3.77% rate)^(a)	Evergy, Inc.	2029	800.0			—			—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0			—			—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0			—			—
Fair value adjustment^(e)			125.5			—			—
Current maturities			(251.1		)	(250.0		)	—
Unamortized debt discount and debt issuance costs			(80.7		)	(40.8		)	(24.4		)
Total excluding current maturities^(d)			$	8,746.7		$	3,436.1		$	2,525.0



December 31, 2018	Issuing Entity	Year Due	Evergy			Evergy Kansas Central			Evergy Metro
Mortgage Bonds			(millions)
5.10% Series	Evergy Kansas Central, Inc.	2020	$	250.0		$	250.0		$	—
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0			250.0			—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0			350.0			—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0			300.0			—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0			550.0			—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0			430.0			—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0			250.0			—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0			300.0			—
6.70% Series	Evergy Kansas South, Inc.	2019	300.0			300.0			—
6.15% Series	Evergy Kansas South, Inc.	2023	50.0			50.0			—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0			175.0			—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0			100.0			—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0			250.0			—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5			—			79.5
7.15% Series 2009A (8.59% rate)^(a)	Evergy Metro, Inc.	2019	400.0			—			400.0
9.44% Series	Evergy Missouri West, Inc.	2019-2021	3.4			—			—
Pollution Control Bonds
2.46% Series^(b)	Evergy Kansas Central, Inc.	2032	45.0			45.0			—
2.46% Series^(b)	Evergy Kansas Central, Inc.	2032	30.5			30.5			—
2.46% Series^(b)	Evergy Kansas South, Inc.	2027	21.9			21.9			—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0			50.0			—
2.46% Series^(b)	Evergy Kansas South, Inc.	2032	14.5			14.5			—
2.46% Series^(b)	Evergy Kansas South, Inc.	2032	10.0			10.0			—
1.865% Series 2007A and 2007B^(b)	Evergy Metro, Inc.	2035	146.5			—			146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4			—			23.4
Senior Notes
3.15% Series	Evergy Metro, Inc.	2023	300.0			—			300.0
3.65% Series	Evergy Metro, Inc.	2025	350.0			—			350.0
6.05% Series (5.78% rate)^(a)	Evergy Metro, Inc.	2035	250.0			—			250.0
5.30% Series	Evergy Metro, Inc.	2041	400.0			—			400.0
4.20% Series	Evergy Metro, Inc.	2047	300.0			—			300.0
4.20% Series	Evergy Metro, Inc.	2048	300.0			—			300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9			—			—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0			—			—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0			—			—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0			—			—
4.85% Series	Evergy, Inc.^(f)	2021	350.0			—			—
5.292% Series	Evergy, Inc.^(f)	2022	287.5			—			—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0			—			—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0			—			—
Fair value adjustment^(e)			144.8			—			—
Current maturities ^(c)			(705.4		)	(300.0		)	(400.0		)
Unamortized debt discount and debt issuance costs			(57.2		)	(37.1		)	(19.3		)
Total excluding current maturities^(d)			$	6,636.3		$	3,389.8		$	2,130.1


^(a)	Rate after amortizing gains/losses recognized in OCI on settlements of interest rate hedging instruments.


^(b)	Variable rate.


^(c)	Evergy's current maturities total as of December 31, 2018, includes $4.3 million of fair value adjustments recorded in connection with purchase accounting for the merger transaction.


^(d)	At December 31, 2019 and 2018, does not include $50.0 million and $21.9 million of secured Series 2005 Environmental Improvement Revenue Refunding (EIRR) bonds because the bonds were repurchased in September 2015 and are held by Evergy Metro.


^(e)	Represents the fair value adjustments recorded at Evergy consolidated related to the long-term debt of Great Plains Energy, Evergy Metro and Evergy Missouri West in connection with purchase accounting for the merger transaction. This amount is not part of future principal payments and will amortize over the remaining life of the associated debt instruments.


^(f)	Originally issued by Great Plains Energy but assumed by Evergy, Inc. as part of the merger transaction.


^(g)	Effectively secured pursuant to the General Mortgage Indenture and Deed of Trust dated as of December 1, 1986, as supplemented (Evergy Metro Mortgage Indenture) through the issuance of collateral mortgage bonds issued to the trustee for the unsecured senior notes in March 2019.

The following table summarizes Evergy's and Evergy Kansas Central's long-term debt of VIEs.



		December 31
	2019				2018
		(millions)
2.398% due 2021		$	51.1			$	81.4
Current maturities		(32.3		)		(30.3		)
Total excluding current maturities		$	18.8			$	51.1

Schedule of Maturities of Long-Term Debt

Evergy's, Evergy Kansas Central's and Evergy Metro's long-term debt maturities and the long-term debt maturities of VIEs for the next five years are detailed in the following table.



	2020		2021		2022		2023		2024
	(millions)
Evergy^(a)	$	251.1	$	432.0	$	387.5	$	439.5	$	800.0
Evergy Kansas Central^(a)	250.0		—		—		50.0		—
Evergy Metro	—		—		—		379.5		—
VIEs	32.3		18.8		—		—		—

^(a)Excludes long-term debt maturities of VIEs.

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Carrying Value and Fair Value of Debt Instruments

The book value and fair value of the Evergy Companies' long-term debt and long-term debt of variable interest entities is summarized in the following table.



	December 31
	2019				2018
	Book Value		Fair Value		Book Value		Fair Value
Long-term debt^(a)	(millions)
Evergy^(b)	$	8,997.8	$	9,750.2	$	7,341.7	$	7,412.1
Evergy Kansas Central	3,686.1		4,078.8		3,689.8		3,771.3
Evergy Metro	2,525.0		2,932.2		2,530.1		2,637.5
Long-term debt of variable interest entities^(a)
Evergy	$	51.1	$	51.5	$	81.4	$	81.3
Evergy Kansas Central	51.1		51.5		81.4		81.3

^(a)Includes current maturities.

Schedule of Fair Value of Assets and Liabilities

The following tables include the Evergy Companies' balances of financial assets and liabilities measured at fair value on a recurring basis.



Description	December 31, 2019			Level 1		Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust^(a)
Domestic equity funds		$	86.1	$	78.6		$	—		$	—		$	7.5
International equity funds		52.0		52.0			—			—			—
Core bond fund		39.3		39.3			—			—			—
High-yield bond fund		22.3		22.3			—			—			—
Emerging markets bond fund		19.4		19.4			—			—			—
Combination debt/equity/other fund		16.4		16.4			—			—			—
Alternative investments fund		23.9		—			—			—			23.9
Real estate securities fund		12.6		—			—			—			12.6
Cash equivalents		0.5		0.5			—			—			—
Total nuclear decommissioning trust		272.5		228.5			—			—			44.0
Rabbi trust
Core bond fund		25.3		—			—			—			25.3
Combination debt/equity/other fund		6.3		—			—			—			6.3
Cash equivalents		0.1		0.1			—			—			—
Total rabbi trust		31.7		0.1			—			—			31.6
Total		$	304.2	$	228.6		$	—		$	—		$	75.6
Evergy Metro
Assets
Nuclear decommissioning trust^(a)
Equity securities		$	211.1	$	211.1		$	—		$	—		$	—
Debt securities
U.S. Treasury		50.3		50.3			—			—			—
U.S. Agency		0.4		—			0.4			—			—
State and local obligations		2.2		—			2.2			—			—
Corporate bonds		33.2		—			33.2			—			—
Foreign governments		0.1		—			0.1			—			—
Cash equivalents		3.1		3.1			—			—			—
Other		0.3		—			0.3			—			—
Total nuclear decommissioning trust		300.7		264.5			36.2			—			—
Self-insured health plan trust^(b)
Equity securities		0.5		0.5			—			—			—
Debt securities		6.7		1.4			5.3			—			—
Cash and cash equivalents		2.7		2.7			—			—			—
Total self-insured health plan trust		9.9		4.6			5.3			—			—
Total		$	310.6	$	269.1		$	41.5		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.3	$	—		$	—		$	—		$	13.3
Cash and cash equivalents		0.5		0.5			—			—			—
Total rabbi trusts		$	13.8	$	0.5		$	—		$	—		$	13.3
Evergy
Assets
Nuclear decommissioning trust^(a)		$	573.2	$	493.0		$	36.2		$	—		$	44.0
Rabbi trusts		45.5		0.6			—			—			44.9
Self-insured health plan trust^(b)		9.9		4.6			5.3			—			—
Total		$	628.6	$	498.2		$	41.5		$	—		$	88.9



Description	December 31, 2018			Level 1			Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust^(a)
Domestic equity funds		$	70.6		$	63.9		$	—		$	—		$	6.7
International equity funds		36.2			36.2			—			—			—
Core bond fund		37.5			37.5			—			—			—
High-yield bond fund		18.9			18.9			—			—			—
Emerging markets bond fund		15.4			15.4			—			—			—
Combination debt/equity/other fund		12.9			12.9			—			—			—
Alternative investments fund		24.1			—			—			—			24.1
Real estate securities fund		11.8			—			—			—			11.8
Cash equivalents		0.1			0.1			—			—			—
Total nuclear decommissioning trust		227.5			184.9			—			—			42.6
Rabbi trust
Core bond fund		24.8			—			—			—			24.8
Combination debt/equity/other fund		5.6			—			—			—			5.6
Cash equivalents		0.2			0.2			—			—			—
Total rabbi trust		30.6			0.2			—			—			30.4
Total		$	258.1		$	185.1		$	—		$	—		$	73.0
Evergy Metro
Assets
Nuclear decommissioning trust^(a)
Equity securities		$	166.6		$	166.6		$	—		$	—		$	—
Debt securities
U.S. Treasury		42.1			42.1			—			—			—
U.S. Agency		0.4			—			0.4			—			—
State and local obligations		2.1			—			2.1			—			—
Corporate bonds		30.9			—			30.9			—			—
Foreign governments		0.1			—			0.1			—			—
Cash equivalents		1.7			1.7			—			—			—
Other		0.7			0.7			—			—			—
Total nuclear decommissioning trust		244.6			211.1			33.5			—			—
Self-insured health plan trust^(b)
Equity securities		0.5			0.5			—			—			—
Debt securities		3.9			0.3			3.6			—			—
Cash and cash equivalents		8.0			8.0			—			—			—
Total self-insured health plan trust		12.4			8.8			3.6			—			—
Total		$	257.0		$	219.9		$	37.1		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.2		$	—		$	—		$	—		$	13.2
Total rabbi trusts		$	13.2		$	—		$	—		$	—		$	13.2
Liabilities
Interest rate swaps^(c)		$	5.4		$	—		$	5.4		$	—		$	—
Total		$	5.4		$	—		$	5.4		$	—		$	—
Evergy
Assets
Nuclear decommissioning trust^(a)		$	472.1		$	396.0		$	33.5		$	—		$	42.6
Rabbi trust		43.8			0.2			—			—			43.6
Self-insured health plan trust^(b)		12.4			8.8			3.6			—			—
Total		$	528.3		$	405.0		$	37.1		$	—		$	86.2
Liabilities
Interest rate swaps^(c)		$	5.4		$	—		$	5.4		$	—		$	—
Total		$	5.4		$	—		$	5.4		$	—		$	—


^(a)	Fair value is based on quoted market prices of the investments held by the trust and/or valuation models.


^(b)	Fair value is based on quoted market prices of the investments held by the trust. Debt securities classified as Level 1 are comprised of U.S. Treasury securities. Debt securities classified as Level 2 are comprised of corporate bonds, U.S. Agency, state and local obligations, and other asset-backed securities.

^(c)

The fair value of interest rate swaps are determined by calculating the net present value of expected payments and receipts under the interest rate swaps using observable market inputs including interest rates and London Interbank Offered Rate (LIBOR) swap rates.

Schedule of Fair Value Investments, Entities that Calculate NAV

The following table provides additional information on these Evergy and Evergy Kansas Central investments.



	December 31, 2019				December 31, 2018				December 31, 2019
	Fair		Unfunded		Fair		Unfunded		Redemption	Length of
	Value		Commitments		Value		Commitments		Frequency	Settlement
Evergy Kansas Central	(millions)
Nuclear decommissioning trust:
Domestic equity funds	$	7.5	$	3.3	$	6.7	$	4.3	(a)	(a)
Alternative investments fund^(b)	23.9		—		24.1		—		Quarterly	65 days
Real estate securities fund^(b)	12.6		—		11.8		—		Quarterly	65 days
Total	$	44.0	$	3.3	$	42.6	$	4.3
Rabbi trust:
Core bond fund	$	25.3	$	—	$	24.8	$	—	(c)	(c)
Combination debt/equity/other fund	6.3		—		5.6		—		(c)	(c)
Total	$	31.6	$	—	$	30.4	$	—
Other Evergy
Rabbi trusts:
Fixed income fund	$	13.3	$	—	$	13.2	$	—	(c)	(c)
Total Evergy investments at NAV	$	88.9	$	3.3	$	86.2	$	4.3

^(a)


^(b)	There is a holdback on final redemptions.

^(c)

This investment can be redeemed immediately and is not subject to any restrictions on redemptions.

Schedule of Fair Value Recurring Gain (Loss) Included in Earnings

The following table summarizes the net unrealized gains (losses) for the Evergy Companies' nuclear decommissioning trusts and rabbi trusts.



		2019		2018			2017
Evergy Kansas Central	(millions)
Nuclear decommissioning trust - equity securities		$	33.3	$	(31.8	)	15.7
Rabbi trust - equity securities		3.2		1.0			(14.3		)
Total		$	36.5	$	(30.8	)	$	1.4
Evergy Metro^(a)
Nuclear decommissioning trust - equity securities		$	40.7	$	(20.7	)	26.7
Nuclear decommissioning trust - debt securities		5.1		(2.5		)	0.5
Total		$	45.8	$	(23.2	)	$	27.2
Evergy
Nuclear decommissioning trust - equity securities		$	74.0	$	(54.1	)	15.7
Nuclear decommissioning trust - debt securities		5.1		(0.5		)	—
Rabbi trusts - equity securities		3.1		1.0			(14.3		)
Total		$	82.2	$	(53.6	)	$	1.4

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Schedule of Contractual Obligation



Evergy
	2020		2021		2022		2023		2024		After 2024			Total
Purchase commitments	(millions)
Fuel	$	486.9	$	137.0	$	83.2	$	84.7	$	17.1		$	94.1		$	903.0
Power	47.3		47.4		47.6		47.8		41.7			325.2			557.0
Other	147.7		42.3		30.0		25.1		19.4			117.7			382.2
Total contractual commitments	$	681.9	$	226.7	$	160.8	$	157.6	$	78.2		$	537.0		$	1,842.2



Evergy Kansas Central
	2020		2021		2022		2023		2024		After 2024			Total
Purchase commitments	(millions)
Fuel	$	269.9	$	33.0	$	47.2	$	45.7	$	11.5		$	59.0		$	466.3
Other	76.5		11.7		4.7		3.0		0.2			—			96.1
Total contractual commitments	$	346.4	$	44.7	$	51.9	$	48.7	$	11.7		$	59.0		$	562.4



Evergy Metro
	2020		2021		2022		2023		2024		After 2024			Total
Purchase commitments	(millions)
Fuel	$	180.2	$	92.5	$	36.0	$	39.0	$	5.6		$	35.1		$	388.4
Power	34.8		34.9		35.1		35.3		29.2			225.4			394.7
Other	58.4		29.0		24.2		21.6		18.7			112.9			264.8
Total contractual commitments	$	273.4	$	156.4	$	95.3	$	95.9	$	53.5		$	373.4		$	1,047.9

RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Tables)

12 Months Ended

Dec. 31, 2019

The following table summarizes Evergy Kansas Central's and Evergy Metro's related party net receivables and payables.



	December 31
	2019			2018
Evergy Kansas Central	(millions)
Net receivable from Evergy Missouri West	$	3.1		$	2.6
Net payable to Evergy Metro	(14.9		)	(13.5		)
Net receivable from (payable to) Evergy	6.9			(1.4		)

Evergy Metro
Net receivable from Evergy Missouri West	$	78.7		$	72.6
Net receivable from Evergy Kansas Central	14.9			13.5
Net receivable from (payable to) Evergy	(4.3		)	15.7

SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of Common Stock Repurchase Program

The following table summarizes the ASRs completed as part of Evergy's common stock repurchase program.



Date ASR Entered	Final Settlement Date	Amount		Shares Delivered
		(millions)
August 2018	October/November 2018	$	450.0	7.9
November 2018	February 2019	475.0		8.3
March 2019	June 2019	450.0		7.8
June 2019	September 2019	500.0		8.1
September 2019	November/December 2019	500.0		7.8

VARIABLE INTEREST ENTITIES (Tables)

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

The following table summarizes the assets and liabilities related to the VIE described above that are recorded on Evergy's and Evergy Kansas Central's consolidated balance sheets.



	December 31
	2019		2018
Assets:	(millions)
Property, plant and equipment of variable interest entities, net	$	162.0	$	169.2
Liabilities:
Current maturities of long-term debt of variable interest entities	$	32.3	$	30.3
Accrued interest^(a)	0.3		0.5
Long-term debt of variable interest entities, net	18.8		51.1

^(a)

Included in accrued interest on Evergy's and Evergy Kansas Central's consolidated balance sheets.

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

TAXES (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Components of income tax expense are detailed in the following tables.



Evergy	2019			2018			2017
Current income taxes	(millions)
Federal	$	(39.5	)	$	(67.4	)	$	0.1
State	15.0			2.2			0.4
Total	(24.5		)	(65.2		)	0.5
Deferred income taxes
Federal	93.2			160.1			122.8
State	27.5			(32.3		)	30.7
Total	120.7			127.8			153.5
Investment tax credit
Deferral	5.2			—			—
Amortization	(4.4		)	(3.6		)	(2.8		)
Total	0.8			(3.6		)	(2.8		)
Income tax expense	$	97.0		$	59.0		$	151.2



Evergy Kansas Central	2019			2018			2017
Current income taxes	(millions)
Federal	$	37.9		$	(0.3	)	$	0.1
State	2.6			(1.8		)	0.4
Total	40.5			(2.1		)	0.5
Deferred income taxes
Federal	(8.9		)	43.5			122.8
State	18.4			(42.9		)	30.7
Total	9.5			0.6			153.5
Investment tax credit
Deferral	5.2			—			—
Amortization	(3.1		)	(2.8		)	(2.8		)
Total	2.1			(2.8		)	(2.8		)
Income tax expense (benefit)	$	52.1		$	(4.3	)	$	151.2



Evergy Metro^(a)	2019			2018			2017
Current income taxes	(millions)
Federal	$	43.9		$	29.8		$	37.4
State	22.4			8.9			8.3
Total	66.3			38.7			45.7
Deferred income taxes
Federal	(24.5		)	(3.4		)	74.7
State	(5.0		)	53.0			8.8
Total	(29.5		)	49.6			83.5
Investment tax credit
Amortization	(1.1		)	(1.0		)	(1.0		)
Total	(1.1		)	(1.0		)	(1.0		)
Income tax expense	$	35.7		$	87.3		$	128.2

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Effective Income Tax Rate Reconciliation

Effective income tax rates reflected in the financial statements and the reasons for their differences from the statutory federal rates are detailed in the following tables.



Evergy	2019		2018		2017
Federal statutory income tax	21.0	%	21.0	%	35.0	%
COLI policies	(1.8	)	(1.9	)	(3.1	)
State income taxes	5.0		4.9		4.1
Flow through depreciation for plant-related differences	(4.5	)	0.8		2.3
Federal tax credits	(4.9	)	(6.4	)	(6.9	)
Non-controlling interest	(0.4	)	(0.4	)	(0.9	)
AFUDC equity	(0.1	)	(0.1	)	(0.2	)
Amortization of federal investment tax credits	(0.5	)	(0.6	)	(0.6	)
Changes in uncertain tax positions, net	(0.2	)	0.1		—
Federal or state tax rate change	—		(8.7	)	2.5
Valuation allowance	(1.0	)	0.4		0.3
Stock compensation	0.1		(0.4	)	(0.9	)
Officer compensation limitation	0.1		1.2		0.2
Other	(0.4	)	(0.2	)	(0.8	)
Effective income tax rate	12.4	%	9.7	%	31.0	%



Evergy Kansas Central	2019		2018		2017
Federal statutory income tax	21.0	%	21.0	%	35.0	%
COLI policies	(3.3	)	(3.3	)	(3.1	)
State income taxes	5.3		5.0		4.1
Flow through depreciation for plant-related differences	(0.1	)	1.6		2.3
Federal tax credits	(7.4	)	(10.4	)	(6.9	)
Non-controlling interest	(0.8	)	(0.6	)	(0.9	)
AFUDC equity	(0.1	)	(0.2	)	(0.2	)
Amortization of federal investment tax credits	(0.7	)	(0.8	)	(0.6	)
Changes in uncertain tax positions, net	(0.4	)	0.1		—
Federal or state tax rate change	—		(15.3	)	2.5
Valuation allowance	(0.4	)	0.5		0.3
Stock compensation	(0.1	)	(0.8	)	(0.9	)
Officer compensation limitation	—		1.8		0.2
Other	(0.3	)	0.2		(0.8	)
Effective income tax rate	12.7	%	(1.2	)%	31.0	%



Evergy Metro^(a)	2019		2018		2017
Federal statutory income tax	21.0	%	21.0	%	35.0	%
COLI policies	(0.2	)	(0.2	)	(0.3	)
State income taxes	4.7		5.5		3.8
Flow through depreciation for plant-related differences	(9.4	)	(2.5	)	0.5
Federal tax credits	(2.5	)	(2.1	)	(2.4	)
AFUDC equity	(0.2	)	(0.1	)	(0.7	)
Amortization of federal investment tax credits	(0.4	)	(0.4	)	(0.3	)
Federal or state tax rate change	—		14.1		5.3
Valuation allowance	—		—		0.4
Stock compensation	—		—		0.2
Officer compensation limitation	0.3		0.6		0.1
Other	(1.0	)	(1.0	)	—
Effective income tax rate	12.3	%	34.9	%	41.6	%

^(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Deferred Income Tax Assets and Liabilities

The tax effects of major temporary differences resulting in deferred income tax assets (liabilities) in the consolidated balance sheets is in the following table.



	December 31
	2019									2018
	Evergy			Evergy Kansas Central			Evergy Metro			Evergy			Evergy Kansas Central			Evergy Metro
Deferred tax assets:	(millions)
Tax credit carryforward	$	548.9		$	337.3		$	204.4		$	508.1		$	307.1		$	194.0
Income taxes refundable to customers, net	466.3			234.3			176.2			478.1			233.1			186.9
Deferred employee benefit costs	197.0			93.4			120.4			215.4			89.6			118.3
Net operating loss carryforward	163.4			23.1			61.9			383.3			60.7			119.2
Deferred state income taxes	64.4			64.4			—			62.5			62.5			—
Alternative minimum tax carryforward	37.9			13.4			—			73.4			26.7			—
Accrued liabilities	80.4			14.5			29.1			82.6			13.6			32.8
Other	183.2			99.1			55.1			193.5			101.7			46.7
Total deferred tax assets before valuation allowance	1,741.5			879.5			647.1			1,996.9			895.0			697.9
Valuation allowances	(17.5		)	—			—			(27.3		)	(1.7		)	—
Total deferred tax assets, net	1,724.0			879.5			647.1			1,969.6			893.3			697.9
Deferred tax liabilities:
Plant-related	(3,107.1		)	(1,481.7		)	(1,157.0		)	(3,164.9		)	(1,491.6		)	(1,199.7		)
Deferred employee benefit costs	(173.3		)	(93.4		)	(79.5		)	(199.9		)	(89.6		)	(86.1		)
Acquisition premium	(68.2		)	(68.2		)	—			(72.6		)	(72.6		)	—
Other	(119.8		)	(53.9		)	(53.4		)	(131.4		)	(54.9		)	(43.9		)
Total deferred tax liabilities	(3,468.4		)	(1,697.2		)	(1,289.9		)	(3,568.8		)	(1,708.7		)	(1,329.7		)
Net deferred income tax liabilities	$	(1,744.4	)	$	(817.7	)	$	(642.8	)	$	(1,599.2	)	$	(815.4	)	$	(631.8	)

Summary of Related Tax Benefit Amounts



	Amount of Benefit
Year of Origin	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2000	$	7.3	$	7.3	$	—
2001	9.7		9.7		—
2002	0.3		0.2		—
2003	0.3		0.2		—
2004	0.3		0.2		—
2005	0.3		0.2		—
2006	0.3		0.2		—
2007	0.6		0.6		—
2008	39.8		0.5		38.9
2009	47.7		0.2		47.4
2010	18.4		—		18.2
2011	13.3		—		13.2
2012	14.4		3.6		10.7
2013	24.3		11.3		12.9
2014	24.1		10.7		13.0
2015	24.7		10.9		13.2
2016	27.1		11.0		12.4
2017	43.9		35.1		8.2
2018	43.9		36.3		7.5
2019	38.3		30.6		7.6
	$	379.0	$	168.8	$	203.2

Summary of Operating Loss Carryforwards

The year of origin of Evergy's, Evergy Kansas Central's and Evergy Metro's related tax benefit amounts for federal NOL carryforwards as of December 31, 2019 are detailed in the following table.



	Amount of Benefit
Year of Origin	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2005	$	19.1	$	—	$	—
2006	32.0		—		—
2014	2.8		0.2		0.9
2015	58.8		—		55.3
2016	4.6		—		—
2017	15.1		12.1		—
	$	132.4	$	12.3	$	56.2

LEASES (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Schedule of Lease Expense

The Evergy Companies’ lease expense is detailed in the following table.



Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Finance lease costs	(millions)
Amortization of right-of-use assets	$	5.2	$	5.0	$	0.1
Interest on lease liabilities	2.9		2.7		0.1
Operating lease costs	23.8		13.2		9.2
Short-term lease costs	4.0		1.2		2.6
Variable lease costs for renewable purchase power agreements	313.0		130.8		129.2
Total lease costs	$	348.9	$	152.9	$	141.2

Supplemental cash flow information related to the Evergy Companies' leases is detailed in the following table.



Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	21.7	$	13.7	$	9.9
Operating cash flows from finance leases	2.8		2.6		0.1
Financing cash flows from finance leases	5.0		4.8		0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	10.4		6.1		2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	8.3		8.3		—

Schedule of Payments for Finance Leases

Payments and other supplemental information for finance leases as of December 31, 2019, are detailed in the following table.



	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2020	$	8.1		$	7.6		$	0.2
2021	7.4			7.0			0.2
2022	6.7			6.2			0.2
2023	5.8			5.4			0.2
2024	4.7			4.3			0.2
After 2024	46.2			44.6			0.9
Total finance lease payments	78.9			75.1			1.9
Amounts representing imputed interest	(26.1		)	(25.0		)	(0.5		)
Present value of lease payments	52.8			50.1			1.4
Less: current portion	(4.9		)	(4.7		)	(0.1		)
Total long-term obligations under finance leases	$	47.9		$	45.4		$	1.3

Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$	302.8		$	43.5		$	1.4

Weighted-average remaining lease term (years)	14.3			14.6			8.7
Weighted-average discount rate	5.6		%	5.5		%	7.6		%

Schedule of Lease Payments for Operating Leases

Lease payments and other supplemental information for operating leases as of December 31, 2019, are detailed in the following table.



	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2020	$	20.5		$	11.6		$	10.7
2021	17.0			8.6			10.1
2022	14.1			6.4			9.3
2023	11.0			3.8			8.8
2024	9.2			2.3			8.5
After 2024	44.7			1.5			82.8
Total operating lease payments	116.5			34.2			130.2
Amounts representing imputed interest	(18.5		)	(2.3		)	(35.4		)
Present value of lease payments	98.0			31.9			94.8
Less: current portion	(15.6		)	(9.1		)	(7.0		)
Total long-term obligations under operating leases	$	82.4		$	22.8		$	87.8

Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$	104.5		$	39.4		$	76.6

Weighted-average remaining lease term (years)	8.8			3.8			15.8
Weighted-average discount rate	3.8		%	3.4		%	4.2		%

QUARTERLY OPERATING RESULTS (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

QUARTERLY OPERATING RESULTS (UNAUDITED)



	Quarter
Evergy	1st		2nd		3rd		4th
2019	(millions, except per share amounts)
Operating revenue	$	1,216.9	$	1,221.7	$	1,577.6	$	1,131.6
Operating income	209.6		271.7		538.7		165.8
Net income	103.4		144.6		370.9		66.7
Net income attributable to Evergy, Inc.	99.5		139.7		366.8		63.9
Basic and diluted earnings per common share	0.39		0.57		1.56		0.28
2018
Operating revenue	$	600.2	$	893.4	$	1,582.5	$	1,199.8
Operating income	123.5		126.9		533.1		150.1
Net income	62.9		104.4		357.6		21.1
Net income attributable to Evergy, Inc.	60.5		101.8		355.0		18.5
Basic and diluted earnings per common share	0.42		0.56		1.32		0.07



	Quarter
Evergy Kansas Central	1st		2nd		3rd		4th
2019	(millions)
Operating revenue	$	596.8	$	585.5	$	749.0	$	576.1
Operating income	124.3		127.6		242.4		102.2
Net income	68.3		67.2		168.2		55.4
Net income attributable to Evergy Kansas Central, Inc.	64.4		62.3		164.1		52.6
2018
Operating revenue	$	600.2	$	650.9	$	764.8	$	599.0
Operating income	123.5		76.1		256.9		94.0
Net income	62.9		77.6		178.0		30.6
Net income attributable to Evergy Kansas Central, Inc.	60.5		75.0		175.4		28.0



	Quarter
Evergy Metro	1st		2nd		3rd		4th
2019	(millions)
Operating revenue	$	425.4	$	437.0	$	568.8	$	375.3
Operating income	56.9		101.9		215.5		52.2
Net income	16.0		59.4		151.9		27.9
2018
Operating revenue	$	397.1	$	452.2	$	559.6	$	414.2
Operating income	61.0		114.7		189.4		44.7
Net income (loss)	20.2		24.6		120.3		(2.2		)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Organization (Details) customer in Millions	12 Months Ended
	Dec. 31, 2019 kV subsidiary customer mi MW
Summary Of Accounting Policies [Line Items]
Owned generating capacity and renewable purchased power \| MW	14,700
Number of customers served \| customer	1.6
Prairie Wind Transmission, LLC
Summary Of Accounting Policies [Line Items]
Transmission line length \| mi	108
Transmission line electrical potential \| kV	345
Transource Energy, LLC \| Evergy Transmission Company LLC
Summary Of Accounting Policies [Line Items]
Ownership percentage	13.50%
Prairie Wind Transmission, LLC \| Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Ownership percentage	50.00%
Evergy Kansas South Inc \| Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Number of active wholly owned subsidiaries \| subsidiary	1
AEP Transmission Holding Company, LLC \| Transource Energy, LLC
Summary Of Accounting Policies [Line Items]
Ownership interest	86.50%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fuel Inventory and Supplies (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Fuel inventory	$ 146.4	$ 168.9
Supplies	335.2	342.1
Fuel inventory and supplies	481.6	511.0
Evergy Kansas Central
Inventory [Line Items]
Fuel inventory	80.2	87.8
Supplies	186.2	189.0
Fuel inventory and supplies	266.4	276.8
Evergy Metro
Inventory [Line Items]
Fuel inventory	46.1	57.8
Supplies	116.9	119.8
Fuel inventory and supplies	$ 163.0	$ 177.6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance For Funds Used During Construction (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 14.5	$ 10.4	$ 5.6
AFUDC equity funds	2.2	3.1	2.0
Total	16.7	13.5	7.6
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	7.5	6.6	5.6
AFUDC equity funds	0.0	2.9	2.0
Total	$ 7.5	$ 9.5	$ 7.6
Public utilities, allowance for funds used during construction, rate	3.00%	3.30%	2.30%
Evergy Metro
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 4.3	$ 4.9	$ 6.1
AFUDC equity funds	2.2	1.4	6.0
Total	$ 6.5	$ 6.3	$ 12.1
Public utilities, allowance for funds used during construction, rate	4.60%	3.90%	4.90%
Evergy Missouri West Inc
Property, Plant and Equipment [Line Items]
Public utilities, allowance for funds used during construction, rate	3.70%	2.90%	1.90%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation rates average	3.00%
Regulatory assets	$ 1,972.2	$ 2,061.8
Depreciation expense reflected in retail rates	$ 9.0
Minimum
Property, Plant and Equipment [Line Items]
Generating facilities	8 years
Transmission facilities	15 years
Distribution facilities	8 years
Other	5 years
Maximum
Property, Plant and Equipment [Line Items]
Generating facilities	87 years
Transmission facilities	94 years
Distribution facilities	73 years
Other	84 years
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 823.7	797.5
Evergy Kansas Central \| Minimum
Property, Plant and Equipment [Line Items]
Generating facilities	8 years
Transmission facilities	36 years
Distribution facilities	19 years
Other	7 years
Evergy Kansas Central \| Maximum
Property, Plant and Equipment [Line Items]
Generating facilities	87 years
Transmission facilities	94 years
Distribution facilities	73 years
Other	84 years
Evergy Metro
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 559.8	626.1
Evergy Metro \| Minimum
Property, Plant and Equipment [Line Items]
Generating facilities	20 years
Transmission facilities	15 years
Distribution facilities	8 years
Other	5 years
Evergy Metro \| Maximum
Property, Plant and Equipment [Line Items]
Generating facilities	60 years
Transmission facilities	70 years
Distribution facilities	55 years
Other	50 years
Retired Generation Facilities
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 130.5	159.9
Retired Generation Facilities \| Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Regulatory assets	0.0	0.0
Retired Generation Facilities \| Evergy Metro
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 0.0	$ 0.0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Corporate-Owned Life Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash surrender value of policies	$ 1,370.0	$ 1,441.7
Borrowings against policies	(1,237.1)	(1,306.9)
Corporate-owned life insurance, net	$ 132.9	$ 134.8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	$ (55.6)	$ (47.8)	$ (20.0)
Other	(21.3)	(30.9)	(19.1)
Other expense	(76.9)	(78.7)	(39.1)
Evergy Kansas Central
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	(20.1)	(23.5)	(20.0)
Other	(20.0)	(23.3)	(19.1)
Other expense	(40.1)	(46.8)	(39.1)
Evergy Metro
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	(20.9)	(25.9)	(42.7)
Other	(0.5)	(5.0)	(8.1)
Other expense	$ (21.4)	$ (30.9)	$ (50.8)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income
Net income	$ 66.7	$ 370.9	$ 144.6	$ 103.4	$ 21.1	$ 357.6	$ 104.4	$ 62.9	$ 685.6	$ 546.0	$ 336.5
Less: Net income attributable to noncontrolling interests									15.7	10.2	12.6
Net income attributable to Evergy, Inc.	$ 63.9	$ 366.8	$ 139.7	$ 99.5	$ 18.5	$ 355.0	$ 101.8	$ 60.5	$ 669.9	$ 535.8	$ 323.9
Common Shares Outstanding
Weighted average number of common shares outstanding - basic (in shares)									239.5	213.9	142.5
Add: effect of dilutive securities (in shares)									0.4	0.2	0.1
Diluted average number of common shares outstanding (in shares)									239.9	214.1	142.6
Basic EPS (in dollars per share)									$ 2.80	$ 2.50	$ 2.27
Diluted EPS (in dollars per share)									$ 2.79	$ 2.50	$ 2.27

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount		0	0
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	785

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	$ 329.5	$ 255.9	$ 153.9
Income taxes, net of refunds	(5.2)	(0.9)	(12.7)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	186.0	(7.8)	158.8
Deconsolidation of property, plant and equipment of VIE	0.0	0.0	(72.9)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	(0.3)	0.5	5.1
Deconsolidation of VIE	0.0	0.0	(83.1)
Evergy Kansas Central
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	143.0	155.3	153.9
Income taxes, net of refunds	29.9	37.5	(12.7)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	92.1	(32.5)	158.8
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	0.0	0.0	5.1
Deconsolidation of VIE	0.0	0.0	(83.1)
Evergy Metro
Cash paid for (received from):
Interest on financing activities, net of amount capitalized	118.4	129.4	128.0
Income taxes, net of refunds	77.0	31.2	38.8
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	80.7	19.2	36.6
Variable Interest Entities
Cash paid for (received from):
Interest on financing activities of VIEs	1.6	2.3	3.1
Variable Interest Entities \| Evergy Kansas Central
Cash paid for (received from):
Interest on financing activities of VIEs	1.6	2.3	3.1
Non-cash investing transactions:
Deconsolidation of property, plant and equipment of VIE	$ 0.0	$ 0.0	$ (72.9)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Mar. 20, 2020	Feb. 29, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 20, 2020
Dividends Payable [Line Items]
Dividends declared on common stock (in dollars per share)			$ 1.93	$ 1.735	$ 1.60
Common Stock \| Subsequent Event
Dividends Payable [Line Items]
Dividends declared on common stock (in dollars per share)		$ 0.505
Dividends paid on common stock (in dollars per share)	$ 0.505
Evergy Kansas Central \| Subsequent Event
Dividends Payable [Line Items]
Dividends Payable						$ 60.0
Evergy Metro \| Subsequent Event
Dividends Payable [Line Items]
Dividends Payable						$ 60.0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Details) - ASU 2016-02 $ in Millions	Jan. 01, 2019 USD ($)
Summary Of Accounting Policies [Line Items]
Lease asset	$ 110
Lease liability	110
Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Lease asset	40
Lease liability	40
Evergy Metro
Summary Of Accounting Policies [Line Items]
Lease asset	80
Lease liability	$ 80

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Narrative (Details) $ in Millions		1 Months Ended	12 Months Ended
	Jun. 04, 2018	May 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Anticipated Merger With Westar Energy, Inc. [Line Items]
Conversion ratio			0.5981
Merger Settlement Agreement \| Kansas Corporation Commission
Anticipated Merger With Westar Energy, Inc. [Line Items]
One-time bill credits		$ 30.6
Additional bill credits		46.0
Additional bill credits, annual amount		11.5
Merger-related savings on current rate cases		$ 30.0
Return on equity refund		50.00%
Charitable contributions period		5 years
Merger transaction costs, recovery amount		$ 30.9
Merger Settlement Agreement \| Missouri Public Service Commission
Anticipated Merger With Westar Energy, Inc. [Line Items]
One-time bill credits		$ 29.1
Charitable contributions period		5 years
Merger transaction costs, recovery amount		$ 16.9
One-time bill credits, period		120 days
Support to promote low-income weatherization, amount		$ 3.0
Support to promote low-income weatherization, period		10 years
Evergy Kansas Central \| Merger Settlement Agreement \| Kansas Corporation Commission
Anticipated Merger With Westar Energy, Inc. [Line Items]
One-time bill credits		$ 23.1
Additional bill credits, annual amount		8.7
Merger-related savings on current rate cases		$ 22.5
Base rate moratorium period		5 years
Merger transaction costs, recovery amount		$ 23.2
Evergy Metro \| Merger Settlement Agreement \| Kansas Corporation Commission
Anticipated Merger With Westar Energy, Inc. [Line Items]
One-time bill credits		7.5
Additional bill credits, annual amount		2.8
Merger-related savings on current rate cases		$ 7.5
Base rate moratorium period		5 years
Merger transaction costs, recovery amount		$ 7.7
Merger transaction costs, recovery period		10 years
Evergy Metro \| Merger Settlement Agreement \| Missouri Public Service Commission
Anticipated Merger With Westar Energy, Inc. [Line Items]
One-time bill credits		$ 14.9
Merger transaction costs, recovery amount		$ 9.7
Evergy Missouri West Inc \| Merger Settlement Agreement \| Kansas Corporation Commission
Anticipated Merger With Westar Energy, Inc. [Line Items]
Merger transaction costs, recovery period		10 years
Evergy Missouri West Inc \| Merger Settlement Agreement \| Missouri Public Service Commission
Anticipated Merger With Westar Energy, Inc. [Line Items]
One-time bill credits		$ 14.2
Merger transaction costs, recovery amount		$ 7.2
Evergy Kansas Central
Anticipated Merger With Westar Energy, Inc. [Line Items]
Conversion ratio	1
Great Plains Energy
Anticipated Merger With Westar Energy, Inc. [Line Items]
Conversion ratio	0.5981
Goodwill decrease from recognition of deferred tax assets			$ 2.3
Revenue of acquiree since acquisition				$ 1,661.1
Earnings or loss of acquiree since acquisition date, actual				236.2
Merger-related costs				$ 148.0	$ 11.9

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Schedule of Pre-tax Costs and Deferrals (Details) - Great Plains Energy $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
One-time bill credits	$ (59.7)
Annual bill credits	(10.5)
Total impact to operating revenues	(70.2)
Charitable contributions and community support	24.7
Voluntary severance and accelerated equity compensation	47.9
Other transaction and transition costs	51.0
Reallocation and deferral of merger transition costs	(47.8)
Total impact to operating and maintenance expense	75.8
Total	(146.0)
Evergy Kansas Central
Business Acquisition [Line Items]
One-time bill credits	(23.1)
Annual bill credits	(7.9)
Total impact to operating revenues	(31.0)
Charitable contributions and community support	0.0
Voluntary severance and accelerated equity compensation	44.2
Other transaction and transition costs	21.5
Reallocation and deferral of merger transition costs	(13.8)
Total impact to operating and maintenance expense	51.9
Total	(82.9)
Evergy Metro
Business Acquisition [Line Items]
One-time bill credits	(22.4)
Annual bill credits	(2.6)
Total impact to operating revenues	(25.0)
Charitable contributions and community support	0.0
Voluntary severance and accelerated equity compensation	2.6
Other transaction and transition costs	2.1
Reallocation and deferral of merger transition costs	(23.2)
Total impact to operating and maintenance expense	(18.5)
Total	$ (6.5)

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Purchase Price Allocation (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jun. 04, 2018 USD ($) $ / shares shares	Dec. 31, 2019
Business Acquisition [Line Items]
Common stock outstanding (in shares)	215,800,074
Awards outstanding (in shares)	(204,825)
Great Plains Energy shares to be converted to Evergy shares (in shares)	215,595,249
Exchange ratio		0.5981
Great Plains Energy
Business Acquisition [Line Items]
Exchange ratio	0.5981
Number of shares issued (in shares)	128,947,518
Closing price (in dollars per share) \| $ / shares	$ 54.00
Total purchase price \| $	$ 6,975.7
Common Stock \| Great Plains Energy
Business Acquisition [Line Items]
Fair value of shares issued \| $	6,963.2
Share-based Payment Arrangement \| Great Plains Energy
Business Acquisition [Line Items]
Fair value of shares issued \| $	$ 12.5

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Schedule Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Jun. 04, 2018
Business Acquisition [Line Items]
Goodwill	$ 2,336.6	$ 2,338.9
Great Plains Energy
Business Acquisition [Line Items]
Current assets			$ 2,151.7
Property, plant and equipment, net			9,179.7
Goodwill			2,336.6
Other long-term assets, excluding goodwill			1,235.9
Total assets			14,903.9
Current liabilities			1,673.9
Long-term liabilities, excluding long-term debt			2,895.7
Long-term debt, net			3,358.6
Total liabilities			7,928.2
Total purchase price			$ 6,975.7

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Unaudited Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Diluted earnings per common share (in dollars per share)	$ 2.67	$ 1.73
Great Plains Energy
Business Acquisition [Line Items]
Operating revenues	$ 5,334.6	$ 5,279.2
Net income attributable to Evergy, Inc.	$ 714.3	$ 468.9
Basic earnings per common share (in dollars per share)	$ 2.67	$ 1.73
Acquisition-related Costs
Business Acquisition [Line Items]
Merger-related, after tax costs	$ 74.7	$ 14.8
Merger-related, reductions of revenues for customer bill credits	44.4
Merger-related after-tax financing costs		278.0
Merger contingent, after-tax mark-to-market interest rate swap gains	$ 36.6	$ 7.3

REVENUE (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
REVENUE (Details) - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									$ 5,019.6	$ 4,224.0
Other									128.2	51.9
Operating revenues	$ 1,131.6	$ 1,577.6	$ 1,221.7	$ 1,216.9	$ 1,199.8	$ 1,582.5	$ 893.4	$ 600.2	5,147.8	4,275.9	$ 2,571.0
Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									2,444.3	2,606.6
Other									63.1	8.3
Operating revenues	576.1	749.0	585.5	596.8	599.0	764.8	650.9	600.2	2,507.4	2,614.9	2,571.0
Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,742.9	1,752.0
Other									63.6	71.1
Operating revenues	$ 375.3	$ 568.8	$ 437.0	$ 425.4	$ 414.2	$ 559.6	$ 452.2	$ 397.1	1,806.5	1,823.1	$ 1,890.7
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,908.1	1,578.8
Residential \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									793.9	846.4
Residential \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									712.4	735.6
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,781.6	1,356.4
Commercial \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									709.1	702.8
Commercial \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									786.1	794.8
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									621.6	527.8
Industrial \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									401.3	396.4
Industrial \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									136.9	138.8
Other retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									47.1	30.6
Other retail \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									21.0	20.0
Other retail \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									16.3	10.4
Total electric retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									4,358.4	3,493.6
Total electric retail \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,925.3	1,965.6
Total electric retail \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,651.7	1,679.6
Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									327.5	404.4
Wholesale \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									239.9	346.1
Wholesale \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									70.9	53.5
Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									309.2	308.1
Transmission \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									273.3	288.9
Transmission \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									17.5	14.5
Industrial steam and other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									24.5	17.9
Industrial steam and other \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									5.8	6.0
Industrial steam and other \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									$ 2.8	$ 4.4

RECEIVABLES (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 127.8	$ 95.0
Allowance for doubtful accounts	(10.5)	(9.2)
Total	228.5	193.7
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	94.5	71.6
Allowance for doubtful accounts	(3.8)	(3.9)
Total	140.4	84.3
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	23.1	15.8
Allowance for doubtful accounts	(4.6)	(3.8)
Total	48.1	62.7
Customer accounts receivable \| Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	7.2	16.7
Customer accounts receivable \| Billed \| Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	0.0	0.0
Customer accounts receivable \| Billed \| Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	3.1	7.8
Customer accounts receivable \| Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	104.0	91.2
Customer accounts receivable \| Unbilled \| Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	49.7	16.6
Customer accounts receivable \| Unbilled \| Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	$ 26.5	$ 42.9

RECEIVABLES - Narrative (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Entity Information [Line Items]
Other receivables, contracts with customers	$ 42,000,000.0	$ 65,800,000
Accounts receivable pledged as collateral	339,000,000.0	365,000,000.0
Evergy Kansas Central
Entity Information [Line Items]
Other receivables, contracts with customers	37,700,000	55,900,000
Accounts receivable pledged as collateral	171,000,000.0	185,000,000.0
Evergy Metro
Entity Information [Line Items]
Other receivables, contracts with customers	1,200,000	5,500,000
Accounts receivable pledged as collateral	118,000,000.0	$ 130,000,000.0
Maximum amount of outstanding principal under receivables agreement	130,000,000.0
Borrowings From Mid October Through Mid June \| Evergy Kansas Central
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	185,000,000.0
Borrowing From Mid June Through Expiration \| Evergy Kansas Central
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	200,000,000.0
Borrowing From Mid June Through Expiration \| Evergy Missouri West Inc
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	65,000,000.0
Borrowings From Mid-November Through Mid-June \| Evergy Missouri West Inc
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	$ 50,000,000.0

RECEIVABLES - Summary of Bad Debt Expense (Details) - Allowance for uncollectible accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	$ 27.2	$ 20.7	$ 10.5
Customer Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	27.3	20.2	10.3
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	7.2	9.0	10.5
Evergy Kansas Central \| Customer Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	7.3	8.5	10.3
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	13.7	13.1	7.5
Evergy Metro \| Customer Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	$ 13.7	$ 13.1	$ 7.6

RATE MATTERS AND REGULATION - Narrative (Details) $ in Millions	1 Months Ended			12 Months Ended
	Sep. 30, 2019 USD ($) Rate	May 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Rate	Aug. 31, 2019 Rate	Mar. 31, 2019 Rate	Dec. 31, 2018 USD ($)	Sep. 30, 2018 Rate
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 2,311.6			$ 2,329.0
Pension and post-retirement costs
Regulatory Proceedings [Line Items]
Remaining amounts of regulatory assets for which no return on investment during recovery period is provided				735.4
Regulatory asset representing differences between pension and post retirement costs for GAAP and for ratemaking				288.4
Analog meter unrecovered investment
Regulatory Proceedings [Line Items]
Remaining amounts of regulatory assets for which no return on investment during recovery period is provided				$ 21.6
Amortization period				5 years
Kansas property tax surcharge
Regulatory Proceedings [Line Items]
Amortization period				1 year
Deferred customer programs
Regulatory Proceedings [Line Items]
Remaining amounts of regulatory assets for which no return on investment during recovery period is provided				$ 10.2
Transmission delivery charge
Regulatory Proceedings [Line Items]
Amortization period				1 year
Fuel recovery mechanisms
Regulatory Proceedings [Line Items]
Amortization period				1 year
Evergy Kansas Central
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 1,174.8			1,121.3
Evergy Kansas Central \| Jeffrey Energy Center
Regulatory Proceedings [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate	8.00%			8.00%	8.00%	8.00%		8.00%
Evergy Kansas Central \| Pension and post-retirement costs
Regulatory Proceedings [Line Items]
Remaining amounts of regulatory assets for which no return on investment during recovery period is provided				$ 359.9
Regulatory asset representing differences between pension and post retirement costs for GAAP and for ratemaking				(23.6)
Evergy Kansas Central \| Analog meter unrecovered investment
Regulatory Proceedings [Line Items]
Remaining amounts of regulatory assets for which no return on investment during recovery period is provided				$ 21.6
Amortization period				5 years
Evergy Metro
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 803.6			847.1
Evergy Metro \| Pension and post-retirement costs
Regulatory Proceedings [Line Items]
Remaining amounts of regulatory assets for which no return on investment during recovery period is provided				312.9
Regulatory asset representing differences between pension and post retirement costs for GAAP and for ratemaking				131.1
Evergy Metro \| Deferred customer programs
Regulatory Proceedings [Line Items]
Remaining amounts of regulatory assets for which no return on investment during recovery period is provided				8.3
Purchase power agreement
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 7.4			8.8
Regulatory liability amortization period				5 years
Purchase power agreement \| Evergy Kansas Central
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 7.4			8.8
Purchase power agreement \| Evergy Metro
Regulatory Proceedings [Line Items]
Regulatory liabilities				0.0			0.0
Fuel recovery mechanisms
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 34.1			0.0
Regulatory liability amortization period				1 year
Fuel recovery mechanisms \| Evergy Kansas Central
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 30.2			0.0
Fuel recovery mechanisms \| Evergy Metro
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 0.0			$ 0.0
La Cygne Station \| Evergy Kansas South Inc
Regulatory Proceedings [Line Items]
VIE ownership percentage				50.00%
Transmission delivery charge \| Evergy Kansas Central \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Annual revenue decrease approved			$ 7.7
Transmission delivery charge \| Evergy Metro \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Annual revenue decrease approved		$ 8.3
2019 RECA Recovery Request \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Pre tax loss to operating and maintenance expense	$ 8.4
2019 RECA Recovery Request \| Evergy Kansas Central \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Pre tax loss to operating and maintenance expense				$ 8.4
2018 Rate Case Proceedings \| Evergy Kansas Central \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Refund percent on earnings over approved return on equity				0.50
Approved return on equity, percentage				9.30%
2018 Rate Case Proceedings \| Evergy Metro \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Refund percent on earnings over approved return on equity				0.5
Approved return on equity, percentage				9.30%
FERC 2020 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of decrease over prior year				$ 6.8
FERC 2020 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of decrease over prior year				(1.7)
FERC 2019 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of decrease over prior year				(11.2)
FERC 2019 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of decrease over prior year				(2.8)
FERC 2018 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of decrease over prior year				2.3
FERC 2018 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of decrease over prior year				3.7
2018 MPSC OPC MECG Petition
Regulatory Proceedings [Line Items]
Annual estimated loss contingency portion not accrued (up to)				12.0
2018 MPSC OPC MECG Petition \| Revenues Probable Of Refund
Regulatory Proceedings [Line Items]
Regulatory liabilities				$ 10.2

RATE MATTERS AND REGULATION - Regulatory Matters Asset (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory Assets	$ 1,972.2	$ 2,061.8
Less: current portion	(231.7)	(303.9)
Total noncurrent regulatory assets	1,740.5	1,757.9
Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	795.9	808.2
Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	105.8	113.5
Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	112.0	134.5
Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	114.3	111.4
Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	55.3	58.0
Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	129.3	102.4
Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	167.1	171.9
Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	29.9	35.6
Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	22.6	23.7
Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	7.1	7.4
Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	26.1	26.8
Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	21.7	33.1
Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	14.8	15.0
La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	13.7	14.8
Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	18.0	19.9
Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	34.7	91.2
Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	39.8	45.2
Transmission delivery charge
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.8
Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	31.0	21.8
Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	31.8	13.6
Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	130.5	159.9
Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	42.3	47.0
Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	28.5	6.1
Evergy Kansas Central
Regulatory Assets [Line Items]
Regulatory Assets	823.7	797.5
Less: current portion	(93.3)	(97.1)
Total noncurrent regulatory assets	730.4	700.4
Evergy Kansas Central \| Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	359.9	343.7
Evergy Kansas Central \| Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	97.3	104.1
Evergy Kansas Central \| Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	55.3	58.0
Evergy Kansas Central \| Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	94.4	65.7
Evergy Kansas Central \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	52.8	49.5
Evergy Kansas Central \| Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	29.9	35.6
Evergy Kansas Central \| Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	22.6	23.7
Evergy Kansas Central \| Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	18.7	23.7
Evergy Kansas Central \| Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	14.8	15.0
Evergy Kansas Central \| La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	11.2	12.2
Evergy Kansas Central \| Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	6.2	7.0
Evergy Kansas Central \| Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	0.0	7.1
Evergy Kansas Central \| Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Transmission delivery charge
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	15.5	10.9
Evergy Kansas Central \| Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	7.4	5.2
Evergy Kansas Central \| Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	20.3	22.6
Evergy Kansas Central \| Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	17.4	13.5
Evergy Metro
Regulatory Assets [Line Items]
Regulatory Assets	559.8	626.1
Less: current portion	(95.4)	(130.9)
Total noncurrent regulatory assets	464.4	495.2
Evergy Metro \| Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	330.7	361.5
Evergy Metro \| Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	7.5	8.2
Evergy Metro \| Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	34.9	36.7
Evergy Metro \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	79.4	91.6
Evergy Metro \| Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	2.8	2.9
Evergy Metro \| Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	13.1	13.5
Evergy Metro \| Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	3.0	9.4
Evergy Metro \| Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	2.5	2.6
Evergy Metro \| Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	8.3	8.0
Evergy Metro \| Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	16.6	41.7
Evergy Metro \| Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	9.0	13.9
Evergy Metro \| Transmission delivery charge
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.8
Evergy Metro \| Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	15.5	10.9
Evergy Metro \| Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	15.6	4.8
Evergy Metro \| Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	15.6	17.3
Evergy Metro \| Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	$ 5.3	$ 2.3

RATE MATTERS AND REGULATION - Regulatory Matters Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 2,311.6	$ 2,329.0
Less: current portion	(63.3)	(110.2)
Total noncurrent regulatory liabilities	2,248.3	2,218.8
Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,656.5	1,703.6
Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	53.6	59.1
Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	50.1	54.1
Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	267.3	188.2
Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	59.3	53.4
Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	28.7	30.3
La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.5
Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	49.1	48.1
Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	17.0	16.5
Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	7.4	8.8
Merger customer credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	7.5
Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	34.1	0.0
Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	10.2	0.0
Refund of tax reform benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	70.9
Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	48.7	59.0
Evergy Kansas Central
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,174.8	1,121.3
Less: current portion	(42.3)	(19.5)
Total noncurrent regulatory liabilities	1,132.5	1,101.8
Evergy Kansas Central \| Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	856.4	853.2
Evergy Kansas Central \| Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	53.6	59.1
Evergy Kansas Central \| Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central \| Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	116.5	84.5
Evergy Kansas Central \| Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	31.5	28.3
Evergy Kansas Central \| Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	28.7	30.3
Evergy Kansas Central \| La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.5
Evergy Kansas Central \| Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central \| Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	17.0	16.5
Evergy Kansas Central \| Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	7.4	8.8
Evergy Kansas Central \| Merger customer credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central \| Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	30.2	0.0
Evergy Kansas Central \| Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central \| Refund of tax reform benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	7.2
Evergy Kansas Central \| Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	3.9	3.9
Evergy Metro
Regulatory Liabilities [Line Items]
Regulatory liabilities	803.6	847.1
Less: current portion	(11.4)	(52.8)
Total noncurrent regulatory liabilities	792.2	794.3
Evergy Metro \| Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	568.9	609.2
Evergy Metro \| Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	50.1	54.1
Evergy Metro \| Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	150.8	103.7
Evergy Metro \| Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	20.3	25.1
Evergy Metro \| Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Merger customer credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	7.5
Evergy Metro \| Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Refund of tax reform benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	36.3
Evergy Metro \| Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 13.5	$ 11.2

GOODWILL (Details) $ in Millions	12 Months Ended
GOODWILL (Details) $ in Millions	Dec. 31, 2019 USD ($) reporting_unit	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill \| $	$ 2,336.6	$ 2,338.9
Number of reporting units \| reporting_unit	1

ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 687.1	$ 405.1
Liabilities assumed upon merger with Great Plains Energy	0.0	412.2
Liabilities incurred during the year	0.0	7.4
Revision in timing and/or estimates	(22.3)	(150.1)
Settlements	(17.8)	(22.4)
Accretion	27.1	34.9
Ending balance	674.1	687.1
Less: current portion	(71.3)	(49.8)
Total noncurrent asset retirement obligation	602.8	637.3
Evergy Kansas Central
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	281.1	405.1
Liabilities assumed upon merger with Great Plains Energy	0.0	0.0
Liabilities incurred during the year	0.0	7.4
Revision in timing and/or estimates	(12.4)	(138.7)
Settlements	(14.8)	(12.0)
Accretion	19.0	19.3
Ending balance	272.9	281.1
Less: current portion	(23.3)	(17.1)
Total noncurrent asset retirement obligation	249.6	264.0
Evergy Metro
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	261.0	266.3
Liabilities assumed upon merger with Great Plains Energy	0.0	0.0
Liabilities incurred during the year	0.0	0.0
Revision in timing and/or estimates	(9.9)	(11.4)
Settlements	(2.5)	(13.1)
Accretion	5.0	19.2
Ending balance	253.6	261.0
Less: current portion	(36.1)	(29.2)
Total noncurrent asset retirement obligation	$ 217.5	231.8
Wolf Creek Unit
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision in timing and/or estimates		$ 127.0
Jointly owned utility plant, proportionate ownership share		47.00%	94.00%	94.00%
Wolf Creek Unit \| Evergy Kansas Central
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Revision in timing and/or estimates		$ 127.0
Jointly owned utility plant, proportionate ownership share		47.00%		47.00%
Wolf Creek Unit \| Evergy Metro
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Jointly owned utility plant, proportionate ownership share			47.00%	47.00%

PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Electric plant in service	$ 27,768.8	$ 26,916.7
Electric plant acquisition adjustment	740.6	740.6
Accumulated depreciation	(10,293.7)	(9,694.1)
Plant in service	18,215.7	17,963.2
Construction work in progress	839.2	685.2
Nuclear fuel, net	128.5	133.1
Plant to be retired, net	1.0	1.0
Property, plant and equipment, net	19,184.4	18,782.5
Variable Interest Entities
Property, Plant and Equipment [Line Items]
Electric plant in service	392.1	392.1
Accumulated depreciation	(230.1)	(222.9)
Property, plant and equipment, net	162.0	169.2
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Electric plant in service	13,538.1	13,176.7
Electric plant acquisition adjustment	740.6	740.6
Accumulated depreciation	(4,951.5)	(4,642.8)
Plant in service	9,327.2	9,274.5
Construction work in progress	472.8	376.7
Nuclear fuel, net	63.9	66.1
Plant to be retired, net	1.0	1.0
Property, plant and equipment, net	9,864.9	9,718.3
Evergy Kansas Central \| Variable Interest Entities
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	162.0	169.2
Evergy Metro
Property, Plant and Equipment [Line Items]
Electric plant in service	10,776.5	10,439.1
Electric plant acquisition adjustment	0.0	0.0
Accumulated depreciation	(4,272.0)	(4,022.4)
Plant in service	6,504.5	6,416.7
Construction work in progress	269.9	204.4
Nuclear fuel, net	64.6	67.0
Plant to be retired, net	0.0	0.0
Property, plant and equipment, net	$ 6,839.0	$ 6,688.1

PROPERTY, PLANT AND EQUIPMENT - Depreciation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 786.3	$ 567.9	$ 350.0
Variable Interest Entities
Property, Plant and Equipment [Line Items]
Depreciation expense	7.1	7.1	8.3
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Depreciation expense	425.8	371.3	350.0
Evergy Metro
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 262.7	$ 235.3	$ 228.4

JOINTLY-OWNED ELECTRIC UTILITY PLANTS (Details) $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019	Dec. 31, 2019 MW	Dec. 31, 2019 Rate	Dec. 31, 2018 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Nuclear fuel, net	$ 128.5				$ 133.1
Wolf Creek Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share		94.00%		94.00%	47.00%
Utility plant in service	3,827.8
Accumulated depreciation	1,835.3
Nuclear fuel, net	128.6
Construction work in progress	141.4
Accredited capacity \| MW			1,104
La Cygne Units
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				100.00%
Utility plant in service	2,202.4
Accumulated depreciation	751.6
Nuclear fuel, net	0.0
Construction work in progress	21.0
Accredited capacity \| MW			1,398
Iatan No. 1 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				88.00%
Utility plant in service	718.9
Accumulated depreciation	269.2
Nuclear fuel, net	0.0
Construction work in progress	54.4
Accredited capacity \| MW			616
Iatan No. 2 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				73.00%
Utility plant in service	1,379.7
Accumulated depreciation	447.2
Nuclear fuel, net	0.0
Construction work in progress	23.5
Accredited capacity \| MW			650
Iatan Common
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				79.00%
Utility plant in service	484.3
Accumulated depreciation	116.4
Nuclear fuel, net	0.0
Construction work in progress	9.4
Jeffrey Energy Center
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				100.00%
Utility plant in service	2,428.6
Accumulated depreciation	918.1
Nuclear fuel, net	0.0
Construction work in progress	38.9
Accredited capacity \| MW			2,186
State Line
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				40.00%
Utility plant in service	114.6
Accumulated depreciation	75.9
Nuclear fuel, net	0.0
Construction work in progress	2.8
Accredited capacity \| MW			196
Evergy Kansas Central
Jointly Owned Utility Plant Interests [Line Items]
Nuclear fuel, net	63.9				$ 66.1
Evergy Kansas Central \| Wolf Creek Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share				47.00%	47.00%
Utility plant in service	1,884.5
Accumulated depreciation	862.2
Nuclear fuel, net	63.9
Construction work in progress	67.3
Accredited capacity \| MW			552
Evergy Kansas Central \| La Cygne Units
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				50.00%
Utility plant in service	1,048.0
Accumulated depreciation	426.5
Nuclear fuel, net	0.0
Construction work in progress	14.6
Accredited capacity \| MW			699
Evergy Kansas Central \| Jeffrey Energy Center
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				92.00%
Utility plant in service	2,223.4
Accumulated depreciation	832.5
Nuclear fuel, net	0.0
Construction work in progress	34.9
Accredited capacity \| MW			2,011
Evergy Kansas Central \| State Line
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				40.00%
Utility plant in service	114.6
Accumulated depreciation	75.9
Nuclear fuel, net	0.0
Construction work in progress	2.8
Accredited capacity \| MW			196
Evergy Metro
Jointly Owned Utility Plant Interests [Line Items]
Nuclear fuel, net	64.6				$ 67.0
Evergy Metro \| Wolf Creek Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share		47.00%		47.00%
Utility plant in service	1,943.3
Accumulated depreciation	973.1
Nuclear fuel, net	64.7
Construction work in progress	74.1
Accredited capacity \| MW			552
Evergy Metro \| La Cygne Units
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				50.00%
Utility plant in service	1,154.4
Accumulated depreciation	325.1
Nuclear fuel, net	0.0
Construction work in progress	6.4
Accredited capacity \| MW			699
Evergy Metro \| Iatan No. 1 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				70.00%
Utility plant in service	575.1
Accumulated depreciation	214.9
Nuclear fuel, net	0.0
Construction work in progress	25.9
Accredited capacity \| MW			490
Evergy Metro \| Iatan No. 2 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				55.00%
Utility plant in service	1,060.7
Accumulated depreciation	393.0
Nuclear fuel, net	0.0
Construction work in progress	3.5
Accredited capacity \| MW			491
Evergy Metro \| Iatan Common
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				61.00%
Utility plant in service	390.1
Accumulated depreciation	99.8
Nuclear fuel, net	0.0
Construction work in progress	$ 1.3
Subsidiaries \| La Cygne Unit 2
Jointly Owned Utility Plant Interests [Line Items]
Leasehold interest percentage		50.00%
Subsidiaries \| Evergy Kansas Central \| La Cygne Unit 2
Jointly Owned Utility Plant Interests [Line Items]
Leasehold interest percentage		50.00%

PENSION PLANS AND POST-RETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	$ 15.6	$ 0.4
Non-qualified benefit obligations	49.4				$ 46.9
Funded by trusts containing assets	45.5				43.8
Contributions to plans in next year	128.1
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0	0.0
Contributions to plans in next year	3.8
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0	0.4
Non-qualified benefit obligations	26.0				24.8
Funded by trusts containing assets	31.7				$ 30.6
Contributions to plans in next year	45.5
Evergy Kansas Central \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0	0.0
Contributions to plans in next year	0.8
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	23.0	16.3
Contributions to plans in next year	82.6
Evergy Metro \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0	$ 0.0
Contributions to plans in next year	$ 3.0
Wolf Creek
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share			94.00%	94.00%	47.00%
Wolf Creek \| Evergy Kansas South Inc
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share			47.00%
Wolf Creek \| Evergy Kansas Central
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share				47.00%	47.00%
Wolf Creek \| Evergy Metro
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share			47.00%	47.00%

PENSION PLANS AND POST-RETIREMENT BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	$ 2,553.4	$ 1,367.0
Service cost	79.1	60.7	$ 28.7
Interest cost	108.0	82.5	52.4
Contribution by participants	0.0	0.0
Plan amendments		13.4
Actuarial gain (loss)	262.4	(98.8)
Benefits paid	(180.5)	(137.9)
Settlements	(96.6)
Obligations assumed upon merger with Great Plains Energy		1,275.9
Other	(7.6)	(9.4)
Defined benefit plan, benefit obligation, end of the year	2,718.2	2,553.4	1,367.0
Change in plan assets
Fair value of plan assets, beginning of the year	1,603.4	887.0
Actual return on plan assets	284.0	(79.7)
Contributions by employer and participants	125.2	114.5
Benefits paid	(175.6)	(134.0)
Settlements	(96.6)
Assets acquired upon merger with Great Plains Energy		825.0
Other	(7.6)	(9.4)
Fair value of plan assets, end of the year	1,732.8	1,603.4	887.0
Funded status at end of year	(985.4)	(950.0)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(5.6)	(4.4)
Noncurrent pension liability and other post-retirement liability	(979.8)	(945.6)
Net amount recognized before regulatory treatment	(985.4)	(950.0)
Accumulated OCI or regulatory asset/liability	454.1	419.9
Net amount recognized at December 31, 2019	(531.3)	(530.1)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	454.1	419.9
Pension Benefits \| Evergy Kansas Central
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	1,258.9	1,367.0
Service cost	29.0	32.2	28.7
Interest cost	53.7	50.7	52.4
Contribution by participants	0.0	0.0
Plan amendments		11.4
Actuarial gain (loss)	120.3	(100.1)
Benefits paid	(136.9)	(97.9)
Settlements	0.0
Obligations assumed upon merger with Great Plains Energy		0.0
Other	(1.6)	(4.4)
Defined benefit plan, benefit obligation, end of the year	1,323.4	1,258.9	1,367.0
Change in plan assets
Fair value of plan assets, beginning of the year	804.6	887.0
Actual return on plan assets	130.5	(30.9)
Contributions by employer and participants	43.0	47.9
Benefits paid	(134.4)	(95.0)
Settlements	0.0
Assets acquired upon merger with Great Plains Energy		0.0
Other	(1.6)	(4.4)
Fair value of plan assets, end of the year	842.1	804.6	887.0
Funded status at end of year	(481.3)	(454.3)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(3.0)	(2.6)
Noncurrent pension liability and other post-retirement liability	(478.3)	(451.7)
Net amount recognized before regulatory treatment	(481.3)	(454.3)
Accumulated OCI or regulatory asset/liability	354.9	337.5
Net amount recognized at December 31, 2019	(126.4)	(116.8)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	354.9	337.5
Pension Benefits \| Evergy Metro
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	1,272.4	1,331.7
Service cost	50.1	48.6	44.2
Interest cost	53.3	49.9	52.6
Contribution by participants	0.0	0.0
Plan amendments		2.0
Actuarial gain (loss)	140.5	(89.6)
Benefits paid	(42.3)	(70.2)
Settlements	(96.6)
Obligations assumed upon merger with Great Plains Energy		0.0
Other	(6.0)	0.0
Defined benefit plan, benefit obligation, end of the year	1,371.4	1,272.4	1,331.7
Change in plan assets
Fair value of plan assets, beginning of the year	798.8	848.4
Actual return on plan assets	153.5	(60.1)
Contributions by employer and participants	82.2	80.3
Benefits paid	(41.2)	(69.8)
Settlements	(96.6)
Assets acquired upon merger with Great Plains Energy		0.0
Other	(6.0)	0.0
Fair value of plan assets, end of the year	890.7	798.8	848.4
Funded status at end of year	(480.7)	(473.6)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(1.3)	(0.5)
Noncurrent pension liability and other post-retirement liability	(479.4)	(473.1)
Net amount recognized before regulatory treatment	(480.7)	(473.6)
Accumulated OCI or regulatory asset/liability	192.3	230.1
Net amount recognized at December 31, 2019	(288.4)	(243.5)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	192.3	230.1
Post-Retirement Benefits
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	249.3	138.6
Service cost	2.5	2.3	1.2
Interest cost	10.5	8.0	5.5
Contribution by participants	8.8	5.6
Plan amendments		0.0
Actuarial gain (loss)	20.9	(11.3)
Benefits paid	(27.7)	(17.3)
Settlements	0.0
Obligations assumed upon merger with Great Plains Energy		123.4
Other	0.0	0.0
Defined benefit plan, benefit obligation, end of the year	264.3	249.3	138.6
Change in plan assets
Fair value of plan assets, beginning of the year	223.3	124.1
Actual return on plan assets	30.0	(7.5)
Contributions by employer and participants	13.2	11.6
Benefits paid	(26.6)	(16.7)
Settlements	0.0
Assets acquired upon merger with Great Plains Energy		111.8
Other	0.0	0.0
Fair value of plan assets, end of the year	239.9	223.3	124.1
Funded status at end of year	(24.4)	(26.0)
Amounts recognized in the consolidated balance sheets
Non-current asset	15.0	17.5
Current pension and other post-retirement liability	(1.9)	(1.7)
Noncurrent pension liability and other post-retirement liability	(37.5)	(41.8)
Net amount recognized before regulatory treatment	(24.4)	(26.0)
Accumulated OCI or regulatory asset/liability	(4.4)	(6.0)
Net amount recognized at December 31, 2019	(28.8)	(32.0)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	(4.4)	(6.0)
Post-Retirement Benefits \| Evergy Kansas Central
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	133.6	138.6
Service cost	1.1	1.3	1.2
Interest cost	5.6	5.0	5.5
Contribution by participants	1.9	1.8
Plan amendments		0.0
Actuarial gain (loss)	9.5	(2.6)
Benefits paid	(13.0)	(10.5)
Settlements	0.0
Obligations assumed upon merger with Great Plains Energy		0.0
Other	0.0	0.0
Defined benefit plan, benefit obligation, end of the year	138.7	133.6	138.6
Change in plan assets
Fair value of plan assets, beginning of the year	109.7	124.1
Actual return on plan assets	20.0	(7.4)
Contributions by employer and participants	3.5	3.2
Benefits paid	(12.7)	(10.2)
Settlements	0.0
Assets acquired upon merger with Great Plains Energy		0.0
Other	0.0	0.0
Fair value of plan assets, end of the year	120.5	109.7	124.1
Funded status at end of year	(18.2)	(23.9)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(1.0)	(0.9)
Noncurrent pension liability and other post-retirement liability	(17.2)	(23.0)
Net amount recognized before regulatory treatment	(18.2)	(23.9)
Accumulated OCI or regulatory asset/liability	(2.9)	0.8
Net amount recognized at December 31, 2019	(21.1)	(23.1)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	(2.9)	0.8
Post-Retirement Benefits \| Evergy Metro
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	115.7	133.2
Service cost	1.4	2.0	2.1
Interest cost	4.9	4.8	5.4
Contribution by participants	6.9	6.6
Plan amendments		0.0
Actuarial gain (loss)	11.4	(18.0)
Benefits paid	(14.7)	(12.9)
Settlements	0.0
Obligations assumed upon merger with Great Plains Energy		0.0
Other	0.0	0.0
Defined benefit plan, benefit obligation, end of the year	125.6	115.7	133.2
Change in plan assets
Fair value of plan assets, beginning of the year	113.6	115.8
Actual return on plan assets	10.0	(1.2)
Contributions by employer and participants	9.7	11.4
Benefits paid	(13.9)	(12.4)
Settlements	0.0
Assets acquired upon merger with Great Plains Energy		0.0
Other	0.0	0.0
Fair value of plan assets, end of the year	119.4	113.6	$ 115.8
Funded status at end of year	(6.2)	(2.1)
Amounts recognized in the consolidated balance sheets
Non-current asset	15.0	17.5
Current pension and other post-retirement liability	(0.9)	(0.8)
Noncurrent pension liability and other post-retirement liability	(20.3)	(18.8)
Net amount recognized before regulatory treatment	(6.2)	(2.1)
Accumulated OCI or regulatory asset/liability	(13.0)	(19.1)
Net amount recognized at December 31, 2019	(19.2)	(21.2)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	(13.0)	(19.1)
Actuarial (gain) loss \| Pension Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	439.7	403.6
Actuarial (gain) loss \| Pension Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	342.3	323.2
Actuarial (gain) loss \| Pension Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	189.4	226.3
Actuarial (gain) loss \| Post-Retirement Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	(5.7)	(7.8)
Actuarial (gain) loss \| Post-Retirement Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	(4.2)	(1.0)
Actuarial (gain) loss \| Post-Retirement Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	(4.9)	(11.0)
Prior service cost \| Pension Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	14.4	16.3
Prior service cost \| Pension Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	12.6	14.3
Prior service cost \| Pension Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	2.9	3.8
Prior service cost \| Post-Retirement Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	1.3	1.8
Prior service cost \| Post-Retirement Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	1.3	1.8
Prior service cost \| Post-Retirement Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	$ (8.1)	$ (8.1)

PENSION PLANS AND POST-RETIREMENT BENEFITS PENSION PLANS AND POST-RETIREMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	$ 47.0	$ 3.0	$ 0.0
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	79.1	60.7	28.7
Interest cost	108.0	82.5	52.4
Expected return on plan assets	(106.3)	(86.4)	(53.6)
Prior service cost	1.9	0.7	0.7
Recognized net actuarial (gain) loss	33.0	32.6	26.9
Settlement and special termination benefits	15.6		0.4
Net periodic benefit costs before regulatory adjustment and intercompany allocations	131.3	90.1	55.5
Regulatory adjustment	37.4	8.3	14.5
Net periodic benefit costs	168.7	98.4	70.0
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	34.2	47.3	19.5
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	202.9	145.7	89.5
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.5	2.3	1.2
Interest cost	10.5	8.0	5.5
Expected return on plan assets	(10.0)	(8.8)	(6.9)
Prior service cost	0.5	0.5	0.5
Recognized net actuarial (gain) loss	(1.2)	(0.6)	(0.8)
Settlement and special termination benefits	0.0		0.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	2.3	1.4	(0.5)
Regulatory adjustment	(3.4)	(1.7)	(1.9)
Net periodic benefit costs	(1.1)	(0.3)	(2.4)
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	1.6	5.0	(5.5)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	0.5	4.7	(7.9)
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	29.0	32.2	28.7
Interest cost	53.7	50.7	52.4
Expected return on plan assets	(54.8)	(55.9)	(53.6)
Prior service cost	1.7	0.7	0.7
Recognized net actuarial (gain) loss	25.5	32.6	26.9
Settlement and special termination benefits	0.0		0.4
Net periodic benefit costs before regulatory adjustment and intercompany allocations	55.1	60.3	55.5
Regulatory adjustment	3.0	8.8	14.5
Intercompany allocations	0.0	0.0	0.0
Net periodic benefit costs	58.1	69.1	70.0
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	17.4	(35.1)	19.5
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	75.5	34.0	89.5
Evergy Kansas Central \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.1	1.3	1.2
Interest cost	5.6	5.0	5.5
Expected return on plan assets	(6.7)	(7.0)	(6.9)
Prior service cost	0.5	0.5	0.5
Recognized net actuarial (gain) loss	(0.6)	(0.6)	(0.8)
Settlement and special termination benefits	0.0		0.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	(0.1)	(0.8)	(0.5)
Regulatory adjustment	(3.0)	(2.0)	(1.9)
Intercompany allocations	0.0	0.0	0.0
Net periodic benefit costs	(3.1)	(2.8)	(2.4)
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	(3.7)	11.8	(5.5)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	(6.8)	9.0	(7.9)
Evergy Metro
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	(0.7)	(3.7)	(4.6)
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	50.1	48.6	44.2
Interest cost	53.3	49.9	52.6
Expected return on plan assets	(48.9)	(55.5)	(51.2)
Prior service cost	0.9	0.7	0.7
Recognized net actuarial (gain) loss	49.8	45.1	49.0
Settlement and special termination benefits	23.0		16.3
Net periodic benefit costs before regulatory adjustment and intercompany allocations	128.2	88.8	111.6
Regulatory adjustment	(19.2)	0.7	(9.2)
Intercompany allocations	(34.4)	(21.6)	(37.1)
Net periodic benefit costs	74.6	67.9	65.3
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	(37.8)	(17.9)	5.7
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	36.8	50.0	71.0
Evergy Metro \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.4	2.0	2.1
Interest cost	4.9	4.8	5.4
Expected return on plan assets	(3.3)	(2.8)	(2.5)
Prior service cost	0.0	0.1	0.0
Recognized net actuarial (gain) loss	(1.4)	(0.2)	(0.5)
Settlement and special termination benefits	0.0		0.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	1.6	3.9	4.5
Regulatory adjustment	0.4	(0.1)	1.3
Intercompany allocations	(0.4)	(1.1)	(1.5)
Net periodic benefit costs	1.6	2.7	4.3
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	6.1	(13.9)	3.5
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	7.7	(11.2)	7.8
Actuarial (gain) loss \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications	84.7	67.2	47.1
Amounts reclassified from accumulated other comprehensive loss	(48.6)	(32.6)	(26.9)
Actuarial (gain) loss \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications	0.9	4.9	(5.8)
Amounts reclassified from accumulated other comprehensive loss	1.2	0.6	0.8
Actuarial (gain) loss \| Evergy Kansas Central \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications	44.6	(13.2)	47.1
Amounts reclassified from accumulated other comprehensive loss	(25.5)	(32.6)	(26.9)
Actuarial (gain) loss \| Evergy Kansas Central \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications	(3.8)	11.7	(5.8)
Amounts reclassified from accumulated other comprehensive loss	0.6	0.6	0.8
Actuarial (gain) loss \| Evergy Metro \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications	35.9	25.9	71.3
Amounts reclassified from accumulated other comprehensive loss	(72.8)	(45.1)	(64.9)
Actuarial (gain) loss \| Evergy Metro \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications	4.7	(14.0)	3.0
Amounts reclassified from accumulated other comprehensive loss	1.4	0.2	0.5
Prior service cost \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications		13.4
Amounts reclassified from accumulated other comprehensive loss	(1.9)	(0.7)	(0.7)
Prior service cost \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications		0.0
Amounts reclassified from accumulated other comprehensive loss	(0.5)	(0.5)	(0.5)
Prior service cost \| Evergy Kansas Central \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications		11.4
Amounts reclassified from accumulated other comprehensive loss	(1.7)	(0.7)	(0.7)
Prior service cost \| Evergy Kansas Central \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications		0.0
Amounts reclassified from accumulated other comprehensive loss	(0.5)	(0.5)	(0.5)
Prior service cost \| Evergy Metro \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications		2.0
Amounts reclassified from accumulated other comprehensive loss	(0.9)	(0.7)	(0.7)
Prior service cost \| Evergy Metro \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other comprehensive income (loss) before reclassifications		0.0
Amounts reclassified from accumulated other comprehensive loss	$ 0.0	$ (0.1)	$ 0.0

PENSION PLANS AND POST-RETIREMENT BENEFITS - Amortized in 2020 (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss amortization	$ 45.4
Prior service cost amortization	1.8
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss amortization	0.2
Prior service cost amortization	0.5
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss amortization	33.9
Prior service cost amortization	1.6
Evergy Kansas Central \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss amortization	0.0
Prior service cost amortization	0.5
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss amortization	45.1
Prior service cost amortization	0.8
Evergy Metro \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss amortization	(0.6)
Prior service cost amortization	$ 0.0

PENSION PLANS AND POST-RETIREMENT BENEFITS - APBO (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	$ 2,390.5	$ 2,257.9
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	2,718.2	2,553.4
Fair value of plan assets	1,732.8	1,603.4
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	2,390.5	2,257.9
Fair value of plan assets	1,732.8	1,603.4
Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	264.3	249.3
Fair value of plan assets	239.9	223.3
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	1,170.2	1,096.7
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	1,371.4	1,272.4
Fair value of plan assets	890.7	798.8
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	1,170.2	1,096.7
Fair value of plan assets	890.7	798.8
Evergy Metro \| Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	125.6	57.7
Fair value of plan assets	119.4	38.2
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	1,196.8	1,139.1
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	1,323.4	1,258.9
Fair value of plan assets	842.1	804.6
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	1,196.8	1,139.1
Fair value of plan assets	842.1	804.6
Evergy Kansas Central \| Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	138.7	133.6
Fair value of plan assets	$ 120.5	$ 109.7

PENSION PLANS AND POST-RETIREMENT BENEFITS - Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	3.62%	4.35%
Rate of compensation increase	3.74%	3.76%
Weighted-average assumptions used to determine net costs
Discount rate	4.35%	3.73%
Expected long-term return on plan assets	6.61%	6.52%
Rate of compensation increase	3.76%	3.92%
Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	3.56%	4.33%
Rate of compensation increase	3.75%	3.50%
Weighted-average assumptions used to determine net costs
Discount rate	4.33%	3.67%
Expected long-term return on plan assets	4.44%	6.00%
Rate of compensation increase	3.50%	3.50%
Evergy Kansas Central \| Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	3.61%	4.35%
Rate of compensation increase	3.78%	4.03%
Weighted-average assumptions used to determine net costs
Discount rate	4.35%	3.73%
Expected long-term return on plan assets	6.75%	6.67%
Rate of compensation increase	4.03%	4.00%
Evergy Kansas Central \| Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	3.54%	4.33%
Weighted-average assumptions used to determine net costs
Discount rate	4.33%	3.73%
Expected long-term return on plan assets	6.00%	6.00%
Evergy Metro Inc \| Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	3.64%	4.36%
Rate of compensation increase	3.71%	3.64%
Weighted-average assumptions used to determine net costs
Discount rate	4.36%	3.72%
Expected long-term return on plan assets	6.47%	6.46%
Rate of compensation increase	3.64%	3.62%
Evergy Metro Inc \| Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	3.58%	4.33%
Rate of compensation increase	3.75%	3.50%
Weighted-average assumptions used to determine net costs
Discount rate	4.33%	3.64%
Expected long-term return on plan assets	2.94%	2.80%
Rate of compensation increase	3.50%	3.50%

PENSION PLANS AND POST-RETIREMENT BENEFITS - Expected Future Services (Details) $ in Millions	Dec. 31, 2019 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	$ 180.6
2021	182.4
2022	181.1
2023	181.8
2024	185.0
2025-2029	918.2
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	16.7
2021	16.7
2022	16.4
2023	16.3
2024	15.9
2025-2029	75.2
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	95.1
2021	95.6
2022	93.3
2023	91.5
2024	91.9
2025-2029	428.3
Evergy Kansas Central \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	9.6
2021	9.5
2022	9.3
2023	9.2
2024	8.8
2025-2029	40.3
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	84.3
2021	85.5
2022	86.5
2023	89.0
2024	91.7
2025-2029	482.3
Evergy Metro \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	7.1
2021	7.2
2022	7.1
2023	7.1
2024	7.1
2025-2029	$ 34.9

PENSION PLANS AND POST-RETIREMENT BENEFITS - Cost Trend Assumptions (Details) - Post-Retirement Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assumed annual health care cost growth rates
Health care cost trend rate assumed for next year	6.30%	6.50%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Effect of 1% increase (decrease)
Effect on total service and interest component	$ 0.0
Effect on post-retirement benefit obligation	0.5
Effect on total service and interest component	0.0
Effect on post-retirement benefit obligation	$ (0.4)
Evergy Metro Inc
Assumed annual health care cost growth rates
Health care cost trend rate assumed for next year	6.30%	6.50%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Effect of 1% increase (decrease)
Effect on total service and interest component	$ 0.0
Effect on post-retirement benefit obligation	0.6
Effect on total service and interest component	0.0
Effect on post-retirement benefit obligation	$ (0.5)
Evergy Kansas Central
Assumed annual health care cost growth rates
Health care cost trend rate assumed for next year	6.30%	6.50%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Effect of 1% increase (decrease)
Effect on total service and interest component	$ 0.0
Effect on post-retirement benefit obligation	(0.1)
Effect on total service and interest component	0.0
Effect on post-retirement benefit obligation	$ 0.1

PENSION PLANS AND POST-RETIREMENT BENEFITS - Employee Savings Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 17.6	$ 16.3	$ 9.7
Evergy Kansas Central
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	9.6	9.9	9.7
Evergy Metro
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 8.0	$ 8.3	$ 7.7

EQUITY COMPENSATION - Narrative (Details) $ in Millions		12 Months Ended
EQUITY COMPENSATION - Narrative (Details) $ in Millions	Jun. 04, 2018 USD ($)	Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 14.6
Exchange ratio		0.5981
Expected volatility, maximum		18.00%
Expected dividend yield		3.45%
Risk-free interest rate, maximum		2.60%
Great Plains Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exchange ratio	0.5981
Share-based Payment Arrangement \| Great Plains Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares issued	$ 12.5

EQUITY COMPENSATION - Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	$ 15.5	$ 30.7	$ 8.9
Income tax benefit	3.0	1.4	3.5
Evergy Kansas Central
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	6.7	24.8	8.9
Income tax benefit	1.9	1.4	3.5
Evergy Metro
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	5.7	6.5	4.2
Income tax benefit	$ 0.3	$ 0.1	$ 1.6

EQUITY COMPENSATION - RSUs (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
RSU With Performance Measures
Nonvested Restricted Share Units
Beginning balance (in shares)	0
Granted (in shares)	202,107
Forfeited (in shares)	(4,857)
Ending balance (in shares)	197,250	0
Grant Date Fair Value
Weighted average beginning balance (in dollars per share)	$ 0
Weighted average granted (in dollars per share)	37.87
Weighted average, forfeited (in dollars per share)	37.87
Weighted average ending balance (in dollars per share)	$ 37.87	$ 0
Remaining weighted-average contractual term (in years)	2 years 2 months 12 days
Total unrecognized compensation expense,	$ 5.4
Vested (in shares)	0
RSUs
Nonvested Restricted Share Units
Beginning balance (in shares)	217,256
Granted (in shares)	70,395
Forfeited (in shares)	(5,534)
Ending balance (in shares)	233,350	217,256
Grant Date Fair Value
Weighted average beginning balance (in dollars per share)	$ 54.07
Weighted average granted (in dollars per share)	54.47	$ 52.16	$ 53.25
Weighted average, vested (in dollars per share)	54.20
Weighted average, forfeited (in dollars per share)	54.23
Weighted average ending balance (in dollars per share)	$ 54.16	$ 54.07
Remaining weighted-average contractual term (in years)	1 year 1 month 6 days
Total unrecognized compensation expense,	$ 5.2
Vested (in shares)	48,767
Total fair value of shares	$ 2.6	$ 16.0	$ 6.1

EQUITY COMPENSATION - Performance Share Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
RSU With Performance Measures
Nonvested Restricted Share Units
Beginning balance (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	(4,857)
Ending balance (in shares)	197,250	0
Grant Date Fair Value
Weighted average beginning balance (in dollars per share)	$ 0
Weighted average, forfeited (in dollars per share)	37.87
Weighted average ending balance (in dollars per share)	$ 37.87	$ 0
Remaining weighted-average contractual term (in years)	2 years 2 months 12 days
Total unrecognized compensation expense,	$ 5.4
Performance Shares
Nonvested Restricted Share Units
Beginning balance (in shares)	348,496
Vested (in shares)	(69,317)	0
Forfeited (in shares)	(6,481)
Performance adjustment (in shares)	(44,442)
Ending balance (in shares)	228,256	348,496
Grant Date Fair Value
Weighted average beginning balance (in dollars per share)	$ 63.80
Weighted average, vested (in dollars per share)	46.11
Weighted average, forfeited (in dollars per share)	69.65
Weighted average, performance adjustment (in dollars per share)	42.97
Weighted average ending balance (in dollars per share)	$ 73.06	$ 63.80
Remaining weighted-average contractual term (in years)	6 months
Weighted-average grant-date fair value of shares granted (in dollars per share)		$ 63.79
Total unrecognized compensation expense,	$ 2.2
Total fair value of shares	$ 3.2

EQUITY COMPENSATION - Restricted Stock (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Nonvested Restricted Share Units
Beginning balance (in shares)	116,675
Vested (in shares)	(38,404)
Forfeited (in shares)	(2,161)
Ending balance (in shares)	76,110	116,675
Grant Date Fair Value
Weighted average beginning balance (in dollars per share)	$ 54.03
Weighted average vested (in dollars per share)	54.35
Weighted average, forfeited (in dollars per share)	53.88
Weighted average ending balance (in dollars per share)	$ 53.87	$ 54.03
Remaining weighted-average contractual term (in years)	8 months 12 days
Granted (in shares)	0
Weighted-average grant-date fair value of shares granted (in dollars per share)		$ 54.05
Total unrecognized compensation expense,	$ 0.8
Total fair value of shares	$ 2.1	$ 0.3

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Narrative (Details)	1 Months Ended
	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Short-term Debt [Line Items]
Available borrowings (up to)			$ 1,921,100,000	$ 1,737,300,000
Cash Borrowings
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity			2,500,000,000
Debt instrument, debt default, threshold			$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)			65.00%
Line of Credit
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity		$ 1,000,000,000.0
Debt instrument, term		6 months
Number of loans \| loan		2
Proceeds from lines of credit		$ 500,000,000.0
Number of remaining loans \| loan		1
Available borrowings (up to)		$ 500,000,000.0
Repayments of lines of credit	$ 1,000,000,000.0
Evergy Kansas Central
Short-term Debt [Line Items]
Available borrowings (up to)			$ 736,600,000	570,000,000.0
Evergy Kansas Central \| Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold			$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)			65.00%
Evergy Metro
Short-term Debt [Line Items]
Available borrowings (up to)			$ 400,700,000	420,400,000
Evergy Metro \| Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold			$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)			65.00%
Evergy Missouri West Inc
Short-term Debt [Line Items]
Available borrowings (up to)			$ 354,500,000	$ 297,900,000
Evergy Missouri West Inc \| Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold			$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)			65.00%
Senior Notes
Short-term Debt [Line Items]
Proceeds from issuance of debt	$ 1,600,000,000

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Schedule of Short Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Credit Facility	$ 2,500.0	$ 2,500.0
Available Borrowings	1,921.1	1,737.3
Evergy, Inc.
Short-term Debt [Line Items]
Credit Facility	450.0	450.0
Available Borrowings	$ 429.3	$ 449.0
Weighted Average Interest Rate on Short-Term Borrowings	2.99%	0.00%
Evergy Kansas Central
Short-term Debt [Line Items]
Credit Facility	$ 1,000.0	$ 1,000.0
Available Borrowings	$ 736.6	$ 570.0
Weighted Average Interest Rate on Short-Term Borrowings	2.07%	3.08%
Evergy Metro Inc
Short-term Debt [Line Items]
Credit Facility	$ 600.0	$ 600.0
Available Borrowings	$ 400.7	$ 420.4
Weighted Average Interest Rate on Short-Term Borrowings	2.02%	2.95%
Evergy Missouri West Inc
Short-term Debt [Line Items]
Credit Facility	$ 450.0	$ 450.0
Available Borrowings	$ 354.5	$ 297.9
Weighted Average Interest Rate on Short-Term Borrowings	2.02%	3.00%
Commercial Paper
Short-term Debt [Line Items]
Long-term line of credit	$ 541.9	$ 738.6
Commercial Paper \| Evergy Kansas Central
Short-term Debt [Line Items]
Long-term line of credit	249.2	411.7
Commercial Paper \| Evergy Metro Inc
Short-term Debt [Line Items]
Long-term line of credit	199.3	176.9
Commercial Paper \| Evergy Missouri West Inc
Short-term Debt [Line Items]
Long-term line of credit	93.4	150.0
Letters of Credit
Short-term Debt [Line Items]
Letters of Credit	17.0	24.1
Letters of Credit \| Evergy, Inc.
Short-term Debt [Line Items]
Letters of Credit	0.7	1.0
Letters of Credit \| Evergy Kansas Central
Short-term Debt [Line Items]
Letters of Credit	14.2	18.3
Letters of Credit \| Evergy Metro Inc
Short-term Debt [Line Items]
Letters of Credit	0.0	2.7
Letters of Credit \| Evergy Missouri West Inc
Short-term Debt [Line Items]
Letters of Credit	2.1	2.1
Cash Borrowings
Short-term Debt [Line Items]
Long-term line of credit	20.0	0.0
Cash Borrowings \| Evergy, Inc.
Short-term Debt [Line Items]
Long-term line of credit	20.0	0.0
Cash Borrowings \| Evergy Kansas Central
Short-term Debt [Line Items]
Long-term line of credit	0.0	0.0
Cash Borrowings \| Evergy Metro Inc
Short-term Debt [Line Items]
Long-term line of credit	0.0	0.0
Cash Borrowings \| Evergy Missouri West Inc
Short-term Debt [Line Items]
Long-term line of credit	$ 0.0	$ 0.0

LONG-TERM DEBT (Details) - USD ($) $ in Millions	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Current maturities	$ (251.1)		$ (705.4)
Unamortized debt discount and debt issuance costs	(80.7)		(57.2)
Total excluding current maturities	8,746.7		6,636.3
Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	$ 125.5		144.8
Current maturities			$ (4.3)
Mortgage Bonds \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Interest rate	5.10%		5.10%
Long-term debt gross	$ 250.0		$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Interest rate	3.25%		3.25%
Long-term debt gross	$ 250.0		$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Interest rate	2.55%		2.55%
Long-term debt gross	$ 350.0		$ 350.0
Mortgage Bonds \| Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Interest rate	3.10%		3.10%
Long-term debt gross	$ 300.0		$ 300.0
Mortgage Bonds \| Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Interest rate	4.125%		4.125%
Long-term debt gross	$ 550.0		$ 550.0
Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Interest rate	4.10%		4.10%
Long-term debt gross	$ 430.0		$ 430.0
Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Interest rate	4.625%		4.625%
Long-term debt gross	$ 250.0		$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Interest rate	4.25%		4.25%
Long-term debt gross	$ 300.0		$ 300.0
Mortgage Bonds \| Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Interest rate	3.25%
Long-term debt gross	$ 300.0
Mortgage Bonds \| Mortgage Bonds Due 2019 EKS
Debt Instrument [Line Items]
Interest rate			6.70%
Long-term debt gross			$ 300.0
Mortgage Bonds \| Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Interest rate	6.15%		6.15%
Long-term debt gross	$ 50.0		$ 50.0
Mortgage Bonds \| Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Interest rate	6.53%		6.53%
Long-term debt gross	$ 175.0		$ 175.0
Mortgage Bonds \| Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Interest rate	6.64%		6.64%
Long-term debt gross	$ 100.0		$ 100.0
Mortgage Bonds \| Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Interest rate	4.30%		4.30%
Long-term debt gross	$ 250.0		$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Interest rate	2.95%		2.95%
Long-term debt gross	$ 79.5		$ 79.5
Mortgage Bonds \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Interest rate	4.125%		7.15%
Long-term debt gross	$ 400.0
Mortgage Bonds \| Mortgage Bonds Due 2019 EM
Debt Instrument [Line Items]
Long-term debt gross			$ 400.0
Mortgage Bonds \| Mortgage Bonds Due 2049A EM
Debt Instrument [Line Items]
Interest rate			8.59%
Mortgage Bonds \| Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Interest rate	9.44%		9.44%
Long-term debt gross	$ 2.3		$ 3.4
Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Interest rate	1.39%		2.46%
Long-term debt gross	$ 45.0		$ 45.0
Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Interest rate	1.39%		2.46%
Long-term debt gross	$ 30.5		$ 30.5
Pollution Control Bonds \| Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Interest rate	1.39%		2.46%
Long-term debt gross	$ 21.9		$ 21.9
Pollution Control Bonds \| Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Interest rate	2.50%		2.50%
Long-term debt gross	$ 50.0		$ 50.0
Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Interest rate	1.39%		2.46%
Long-term debt gross	$ 14.5		$ 14.5
Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Interest rate	1.39%		2.46%
Long-term debt gross	$ 10.0		$ 10.0
Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Interest rate	1.432%		1.865%
Long-term debt gross	$ 146.5		$ 146.5
Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Interest rate	2.75%		2.75%
Long-term debt gross	$ 23.4		$ 23.4
Senior Notes \| Series Notes Due 2023 EM
Debt Instrument [Line Items]
Interest rate	3.15%		3.15%
Long-term debt gross	$ 300.0		$ 300.0
Senior Notes \| Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Interest rate	3.65%		3.65%
Long-term debt gross	$ 350.0		$ 350.0
Senior Notes \| Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Interest rate	6.05%		6.05%
Long-term debt gross	$ 250.0		$ 250.0
Senior Notes \| Senior Notes Due 2035A EM
Debt Instrument [Line Items]
Interest rate	5.78%
Senior Notes \| Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Interest rate	5.30%		5.30%
Long-term debt gross	$ 400.0		$ 400.0
Senior Notes \| Senior Notes Due 2041 EMA
Debt Instrument [Line Items]
Interest rate			5.78%
Senior Notes \| Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Interest rate	4.20%		4.20%
Long-term debt gross	$ 300.0		$ 300.0
Senior Notes \| Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Interest rate	4.20%		4.20%
Long-term debt gross	$ 300.0		$ 300.0
Senior Notes \| Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Interest rate	8.27%		8.27%
Long-term debt gross	$ 80.9		$ 80.9
Senior Notes \| Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Interest rate	3.49%		3.49%
Long-term debt gross	$ 36.0		$ 36.0
Senior Notes \| Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Interest rate	4.06%		4.06%
Long-term debt gross	$ 60.0		$ 60.0
Senior Notes \| Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Interest rate	4.74%		4.74%
Long-term debt gross	$ 150.0		$ 150.0
Senior Notes \| Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Interest rate	3.74%
Long-term debt gross	$ 100.0
Senior Notes \| Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate	4.85%		4.85%
Long-term debt gross	$ 350.0		$ 350.0
Senior Notes \| Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate	5.292%		5.292%
Long-term debt gross	$ 287.5		$ 287.5
Senior Notes \| Senior Notes Due 2024
Debt Instrument [Line Items]
Interest rate	2.45%
Long-term debt gross	$ 800.0
Senior Notes \| Senior Notes Due 2029
Debt Instrument [Line Items]
Interest rate	2.90%
Long-term debt gross	$ 800.0
Senior Notes \| Senior Notes Due 2029A
Debt Instrument [Line Items]
Interest rate	3.77%
Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Interest rate	7.33%		7.33%
Long-term debt gross	$ 3.0		$ 3.0
Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Interest rate	7.17%		7.17%
Long-term debt gross	$ 7.0		$ 7.0
Evergy Kansas Central
Debt Instrument [Line Items]
Current maturities	(250.0)		(300.0)
Unamortized debt discount and debt issuance costs	(40.8)		(37.1)
Total excluding current maturities	3,436.1		3,389.8
Evergy Kansas Central \| Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Long-term debt gross	250.0		250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Long-term debt gross	250.0		250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Long-term debt gross	350.0		350.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0		300.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Long-term debt gross	550.0		550.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	430.0		430.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	250.0		250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0		300.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2019 EKS
Debt Instrument [Line Items]
Long-term debt gross			300.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Long-term debt gross	50.0		50.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Long-term debt gross	175.0		175.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Long-term debt gross	100.0		100.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Long-term debt gross	250.0		250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2019 EM
Debt Instrument [Line Items]
Long-term debt gross			0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Long-term debt gross	45.0		45.0
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Long-term debt gross	30.5		30.5
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Long-term debt gross	21.9		21.9
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Long-term debt gross	50.0		50.0
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Long-term debt gross	14.5		14.5
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Long-term debt gross	10.0		10.0
Evergy Kansas Central \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Series Notes Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2021
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Kansas Central \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Kansas Central \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc
Debt Instrument [Line Items]
Current maturities	0.0		(400.0)
Unamortized debt discount and debt issuance costs	(24.4)		(19.3)
Total excluding current maturities	2,525.0		2,130.1
Evergy Metro Inc \| Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Long-term debt gross
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2019 EKS
Debt Instrument [Line Items]
Long-term debt gross			0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	79.5		79.5
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Interest rate		4.125%
Long-term debt gross	400.0	$ 400.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due 2019 EM
Debt Instrument [Line Items]
Interest rate		7.15%
Long-term debt gross			400.0
Evergy Metro Inc \| Mortgage Bonds \| Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Mortgage Bonds \| General Mortgage Bonds EIRR Series 2005
Debt Instrument [Line Items]
Long-term debt gross	50.0		21.9
Evergy Metro Inc \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Pollution Control Bonds \| Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Pollution Control Bonds \| Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	146.5		146.5
Evergy Metro Inc \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Long-term debt gross	23.4		23.4
Evergy Metro Inc \| Senior Notes \| Series Notes Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0		300.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Long-term debt gross	350.0		350.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	250.0		250.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Long-term debt gross	400.0		400.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0		300.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0		300.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2021
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Metro Inc \| Senior Notes \| Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Metro Inc \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0		0.0
Evergy Metro Inc \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	$ 0.0		0.0
Evergy Metro Inc \| Unsecured Debt
Debt Instrument [Line Items]
Interest rate	75.00%
Variable Interest Entities
Debt Instrument [Line Items]
Current maturities	$ (32.3)		(30.3)
Total excluding current maturities	$ 18.8		51.1
Variable Interest Entities \| Unsecured Debt \| Unsecured Debt Due 2021 VIEs
Debt Instrument [Line Items]
Interest rate	2.398%
Long-term debt gross	$ 51.1		81.4
Current maturities	(32.3)		(30.3)
Total excluding current maturities	18.8		51.1
Variable Interest Entities \| Evergy Kansas Central
Debt Instrument [Line Items]
Current maturities	(32.3)		(30.3)
Total excluding current maturities	$ 18.8		$ 51.1

LONG-TERM DEBT - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
LONG-TERM DEBT - Narrative (Details) - USD ($)	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Aug. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Additional principal first mortgage bonds available to be issued			$ 2,828,600,000
Senior Notes \| Senior Notes Due 2024 Evergy
Debt Instrument [Line Items]
Interest rate				2.45%
Long-term debt gross				$ 800,000,000.0
Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate				2.90%
Long-term debt gross				$ 800,000,000.0
Secured Debt \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Interest rate			4.125%			7.15%
Long-term debt gross			$ 400,000,000.0
Secured Debt \| Mortgage Bonds Due 2019 EM
Debt Instrument [Line Items]
Long-term debt gross						$ 400,000,000.0
Evergy Kansas Central
Debt Instrument [Line Items]
Maximum amount of first mortgage bonds authorized			3,500,000,000
Additional principal first mortgage bonds available to be issued			305,400,000
Evergy Kansas Central \| Secured Debt \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Long-term debt gross			0
Evergy Kansas Central \| Secured Debt \| Mortgage Bonds Due 2019 EM
Debt Instrument [Line Items]
Long-term debt gross						0
Evergy Kansas Central \| Secured Debt \| Mortgage Bonds Due 2049 KS Central
Debt Instrument [Line Items]
Interest rate					3.25%
Long-term debt gross					$ 300,000,000.0
Evergy Metro
Debt Instrument [Line Items]
Additional principal first mortgage bonds available to be issued			$ 4,923,300,000
Evergy Metro \| Unsecured Debt
Debt Instrument [Line Items]
Interest rate			75.00%
Evergy Metro \| Unsecured Debt \| Senior Notes Due 2023 Evergy Metro
Debt Instrument [Line Items]
Interest rate			3.15%
Long-term debt gross			$ 300,000,000.0
Evergy Metro \| Unsecured Debt \| Senior Notes Due 2025 Evergy Metro
Debt Instrument [Line Items]
Interest rate			3.65%
Long-term debt gross			$ 350,000,000.0
Evergy Metro \| Unsecured Debt \| Senior Notes Due 2035 Evergy Metro
Debt Instrument [Line Items]
Interest rate			6.05%
Long-term debt gross			$ 250,000,000.0
Evergy Metro \| Unsecured Debt \| Senior Notes Due 2041 Evergy Metro
Debt Instrument [Line Items]
Interest rate			5.30%
Long-term debt gross			$ 400,000,000.0
Evergy Metro \| Unsecured Debt \| Senior Notes Due 2047 Evergy Metro
Debt Instrument [Line Items]
Interest rate			4.20%
Long-term debt gross			$ 300,000,000.0
Evergy Metro \| Unsecured Debt \| Senior Notes Due 2048 Evergy Metro
Debt Instrument [Line Items]
Interest rate			4.20%
Long-term debt gross			$ 300,000,000.0
Evergy Metro \| Secured Debt \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Interest rate		4.125%
Long-term debt gross		$ 400,000,000.0	$ 400,000,000.0
Evergy Metro \| Secured Debt \| Mortgage Bonds Due 2019 EM
Debt Instrument [Line Items]
Interest rate		7.15%
Long-term debt gross						$ 400,000,000.0
Repayments of long-term debt		$ 400,000,000.0
Evergy Kansas South Inc \| Secured Debt \| Mortgage Bonds Due 2019 Evergy KS South
Debt Instrument [Line Items]
Interest rate	6.70%
Repayments of long-term debt	$ 300,000,000.0
Evergy Missouri West Inc \| Senior Notes \| Senior Notes Due 2022 Evergy MO West
Debt Instrument [Line Items]
Interest rate		3.74%
Long-term debt gross		$ 100,000,000.0

LONG-TERM DEBT - Scheduled Maturities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
2020	$ 251.1
2021	432.0
2022	387.5
2023	439.5
2024	800.0
VIEs
Debt Instrument [Line Items]
2020	32.3
2021	18.8
2022	0.0
2023	0.0
2024	0.0
Evergy Kansas Central
Debt Instrument [Line Items]
2020	250.0
2021	0.0
2022	0.0
2023	50.0
2024	0.0
Evergy Metro
Debt Instrument [Line Items]
2020	0.0
2021	0.0
2022	0.0
2023	379.5
2024	$ 0.0

FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	1 Months Ended	10 Months Ended	12 Months Ended
FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment for settlement of interest rate swap accounted for as a cash flow hedge	$ 69,800,000		$ 69,800,000	$ 0	$ 0
Notional amount	500,000,000.0	$ 500,000,000.0
Other comprehensive loss		69,800,000	64,400,000	5,400,000
Interest expense			374,000,000.0	279,600,000	171,000,000.0
Income tax expense (benefit)			97,000,000.0	59,000,000.0	$ 151,200,000
Reclassification to expenses, net of tax			1,500,000	$ 0
Accumulated other comprehensive loss over the next twelve months			5,200,000
Senior Notes Due 2029 Evergy \| Senior Notes
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt issued	$ 800,000,000.0	$ 800,000,000.0
Interest rate	2.90%	2.90%
Debt instrument, term		10 years
Reclassification out of Accumulated Other Comprehensive Income \| Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Interest expense			(2,000,000.0)
Income tax expense (benefit)			$ 500,000

FAIR VALUE MEASUREMENTS - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Book Value \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 8,997.8	$ 7,341.7
Book Value \| Fair Value, Measurements, Recurring \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	51.1	81.4
Fair Value \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	9,750.2	7,412.1
Fair Value \| Fair Value, Measurements, Recurring \| Level 2 \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	51.5	81.3
Evergy Kansas Central \| Book Value \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	3,686.1	3,689.8
Evergy Kansas Central \| Book Value \| Fair Value, Measurements, Recurring \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	51.1	81.4
Evergy Kansas Central \| Fair Value \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	4,078.8	3,771.3
Evergy Kansas Central \| Fair Value \| Fair Value, Measurements, Recurring \| Level 2 \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	51.5	81.3
Evergy Metro \| Book Value \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	2,525.0	2,530.1
Evergy Metro \| Fair Value \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	2,932.2	2,637.5
Long-Term debt fair value adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt gross	125.5	144.8
Long-Term debt fair value adjustment \| Evergy Kansas Central
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt gross	0.0	0.0
Long-Term debt fair value adjustment \| Evergy Metro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt gross	$ 0.0	$ 0.0

FAIR VALUE MEASUREMENTS - NAV (Details) $ in Millions	12 Months Ended
FAIR VALUE MEASUREMENTS - NAV (Details) $ in Millions	Dec. 31, 2019 USD ($) fund extension	Dec. 31, 2018 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 3.3	$ 4.3
Evergy Kansas Central \| Alternative investments fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Real estate securities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Nuclear decommissioning trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	44.0
Unfunded Commitments	3.3	4.3
Evergy Kansas Central \| Core bond fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Combination debt/equity/other fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Rabbi trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Other Evergy
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Domestic \| Evergy Kansas Central \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 3.3	4.3
NAV, number of funds \| fund	5
NAV, number of funds making distributions \| fund	3
Domestic \| Evergy Kansas Central \| Equity Securities - Fourth Fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Length of settlement	15 years
NAV, number of extensions \| extension	3
NAV, extension term	1 year
Domestic \| Evergy Kansas Central \| Equity Securities - Fifth Fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Length of settlement	15 years
Fair Value, Measurements, Recurring
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	$ 573.2	472.1
Total rabbi trust	45.5	43.8
Total Assets	628.6	528.3
Fair Value, Measurements, Recurring \| Evergy Kansas Central
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	272.5	227.5
Total rabbi trust	31.7	30.6
Total Assets	304.2	258.1
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Alternative investments fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	23.9	24.1
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Real estate securities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	12.6	11.8
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Core bond fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	39.3	37.5
Total rabbi trust	25.3	24.8
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Combination debt/equity/other fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	16.4	12.9
Total rabbi trust	6.3	5.6
Fair Value, Measurements, Recurring \| Other Evergy
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total rabbi trust	13.8	13.2
Fair Value, Measurements, Recurring \| Domestic \| Evergy Kansas Central \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	86.1	70.6
NAV \| Fair Value, Measurements, Recurring
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	44.0	42.6
Total rabbi trust	44.9	43.6
Total Assets	88.9	86.2
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	44.0	42.6
Total rabbi trust	31.6	30.4
Total Assets	75.6	73.0
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Alternative investments fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	23.9	24.1
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Real estate securities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	12.6	11.8
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Nuclear decommissioning trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust		42.6
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Core bond fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	25.3	24.8
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Combination debt/equity/other fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	6.3	5.6
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Rabbi trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total rabbi trust	31.6	30.4
NAV \| Fair Value, Measurements, Recurring \| Other Evergy
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total rabbi trust	13.3	13.2
NAV \| Fair Value, Measurements, Recurring \| Domestic \| Evergy Kansas Central \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	$ 7.5	$ 6.7

FAIR VALUE MEASUREMENTS - Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	$ 82.2	$ (53.6)	$ 1.4
Nuclear decommissioning trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	74.0	(54.1)	15.7
Rabbi trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	3.1	1.0	(14.3)
Nuclear decommissioning trust - debt securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	5.1	(0.5)	0.0
Evergy Kansas Central
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	36.5	(30.8)	1.4
Evergy Kansas Central \| Nuclear decommissioning trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	33.3	(31.8)	15.7
Evergy Kansas Central \| Rabbi trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	3.2	1.0	(14.3)
Evergy Metro
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	45.8	(23.2)	27.2
Evergy Metro \| Nuclear decommissioning trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	40.7	(20.7)	26.7
Evergy Metro \| Nuclear decommissioning trust - debt securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	$ 5.1	$ (2.5)	$ 0.5

COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	Dec. 31, 2019 USD ($)
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Industry aggregate limit for nuclear insurance	$ 3,200.0
Industry aggregate limit for non nuclear insurance	1,800.0
Nuclear liability insurance, full limit of public liability	13,900.0
Nuclear liability insurance, maximum available commercial insurance	400.0
Nuclear liability insurance, industry wide retrospective assessment program	13,500.0
Nuclear liability insurance, owners insurance amount, maximum	137.6
Nuclear liability insurance, owners insurance, amount per incident	20.5
Nuclear liability insurance, owners property insurance, maximum	2,800.0
Nuclear liability insurance, owners nonnuclear property insurance, maximum	2,300.0
Nuclear liability insurance, owners property insurance assessment, maximum	33.2
Evergy
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Nuclear liability insurance, owners insurance amount, maximum	129.2
Nuclear liability insurance, owners insurance, amount per incident	19.2
Nuclear liability insurance, owners property insurance assessment, maximum	31.2
Evergy Kansas Central
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Nuclear liability insurance, owners insurance amount, maximum	64.6
Nuclear liability insurance, owners insurance, amount per incident	9.6
Nuclear liability insurance, owners property insurance assessment, maximum	$ 15.6

COMMITMENTS AND CONTINGENCIES - Contractual Commitments (Details) $ in Millions	Dec. 31, 2019 USD ($)
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	$ 681.9
2021	226.7
2022	160.8
2023	157.6
2024	78.2
After 2024	537.0
Total	1,842.2
Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	486.9
2021	137.0
2022	83.2
2023	84.7
2024	17.1
After 2024	94.1
Total	903.0
Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	47.3
2021	47.4
2022	47.6
2023	47.8
2024	41.7
After 2024	325.2
Total	557.0
Other
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	147.7
2021	42.3
2022	30.0
2023	25.1
2024	19.4
After 2024	117.7
Total	382.2
Evergy Kansas Central
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	346.4
2021	44.7
2022	51.9
2023	48.7
2024	11.7
After 2024	59.0
Total	562.4
Evergy Kansas Central \| Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	269.9
2021	33.0
2022	47.2
2023	45.7
2024	11.5
After 2024	59.0
Total	466.3
Evergy Kansas Central \| Other
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	76.5
2021	11.7
2022	4.7
2023	3.0
2024	0.2
After 2024	0.0
Total	96.1
Evergy Metro
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	273.4
2021	156.4
2022	95.3
2023	95.9
2024	53.5
After 2024	373.4
Total	1,047.9
Evergy Metro \| Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	180.2
2021	92.5
2022	36.0
2023	39.0
2024	5.6
After 2024	35.1
Total	388.4
Evergy Metro \| Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	34.8
2021	34.9
2022	35.1
2023	35.3
2024	29.2
After 2024	225.4
Total	394.7
Evergy Metro \| Other
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2020	58.4
2021	29.0
2022	24.2
2023	21.6
2024	18.7
After 2024	112.9
Total	$ 264.8

GUARANTEES (Details) $ in Millions	Dec. 31, 2019 USD ($)
Guarantor Obligations [Line Items]
Maximum exposure	$ 110.2
Commercial Paper
Guarantor Obligations [Line Items]
Maximum exposure	93.4
Guarantee \| Evergy Missouri West Inc
Guarantor Obligations [Line Items]
Maximum exposure	17.0
Guarantee of Indebtedness of Others \| Evergy Missouri West Inc
Guarantor Obligations [Line Items]
Maximum exposure	$ 93.2

RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Aug. 31, 2019	Mar. 31, 2019	Sep. 30, 2018
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	$ 104,500,000
Lease liability recorded in other current liabilities	15,600,000
Total long-term obligations under operating leases	82,400,000
Evergy Metro
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	76,600,000
Lease liability recorded in other current liabilities	7,000,000.0
Total long-term obligations under operating leases	87,800,000
Evergy Metro \| Money Pool
Related Party Transaction [Line Items]
Due from (to) related parties	0	$ 0
Evergy Metro \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Due from (to) related parties	78,700,000	72,600,000
Evergy Metro \| Evergy Kansas Central
Related Party Transaction [Line Items]
Due from (to) related parties	14,900,000	13,500,000
Evergy Metro \| Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	(4,300,000)	15,700,000
Evergy Metro \| Evergy \| Income Taxes Payable
Related Party Transaction [Line Items]
Due from (to) related parties	14,100,000	2,000,000.0
Evergy Kansas Central
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	39,400,000
Lease liability recorded in other current liabilities	9,100,000
Total long-term obligations under operating leases	22,800,000
Evergy Kansas Central \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Due from (to) related parties	3,100,000	2,600,000
Evergy Kansas Central \| Evergy Metro
Related Party Transaction [Line Items]
Due from (to) related parties	(14,900,000)	(13,500,000)
Evergy Kansas Central \| Evergy Metro \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	40,600,000	17,500,000
Evergy Kansas Central \| Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	6,900,000	(1,400,000)
Evergy Kansas Central \| Evergy \| Income Tax Receivable
Related Party Transaction [Line Items]
Due from (to) related parties	(37,900,000)	(42,700,000)
Evergy Kansas Central \| Evergy Metro \| Subsidiary of Common Parent
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	29,500,000
Lease liability recorded in other current liabilities	600,000
Total long-term obligations under operating leases	$ 28,900,000
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	18.00%
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 \| Evergy Metro \| Evergy Missouri West Inc \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	$ 172,800,000	183,200,000	$ 196,300,000
Jeffrey Energy Center \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	8.00%
Jeffrey Energy Center \| Evergy Kansas Central
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	8.00%			8.00%	8.00%	8.00%	8.00%
Jeffrey Energy Center \| Evergy Kansas Central \| Evergy Missouri West Inc \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	$ 24,900,000	12,300,000
La Cygne Station \| Evergy Metro \| Evergy Kansas Central \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	$ 154,900,000	$ 82,900,000
La Cygne Station \| Evergy Kansas Central
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	50.00%

SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($) $ in Millions	12 Months Ended	17 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2018
Line of Credit Facility [Line Items]
Common stock, shares authorized (in shares)	600,000,000	600,000,000	600,000,000
Preferred stock, shares authorized (in shares)	12,000,000	12,000,000
Number of shares authorized to be repurchased (in shares)				60,000,000
Stock repurchased and retired during period under repurchase plan, value	$ 1,628.7	$ 2,671.0
Stock repurchased and retired during period (in shares)	28,800,000	45,200,000
Restriction on payment of dividends (at least)	35.00%	35.00%
Restricted net assets of subsidiaries	$ 5,000.0	$ 5,000.0
Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
Evergy Kansas Central
Line of Credit Facility [Line Items]
Common stock, shares authorized (in shares)	1,000	1,000	1,000
Restriction on payment of dividends (at least)	40.00%	40.00%
Evergy Kansas Central \| Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
Evergy Metro
Line of Credit Facility [Line Items]
Common stock, shares authorized (in shares)	1,000	1,000	1,000
Restriction on payment of dividends (at least)	40.00%	40.00%
Retained earnings restrictions	$ 152.0	$ 152.0
Evergy Metro \| Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
Evergy Missouri West Inc \| Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)	65.00%	65.00%

SHAREHOLDERS' EQUITY - Common Stock Repurchase Program (Details) shares in Millions	Dec. 31, 2019 USD ($) shares
August 2018 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 450,000,000.0
Shares Delivered (in shares) \| shares	7.9
November 2018 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 475,000,000.0
Shares Delivered (in shares) \| shares	8.3
March 2019 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 450,000,000.0
Shares Delivered (in shares) \| shares	7.8
June 2019 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 500,000,000.0
Shares Delivered (in shares) \| shares	8.1
September 2019 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 500,000,000.0
Shares Delivered (in shares) \| shares	7.8

VARIABLE INTEREST ENTITIES - Narrative (Details)	1 Months Ended		3 Months Ended	12 Months Ended
VARIABLE INTEREST ENTITIES - Narrative (Details)	Aug. 31, 2019	Jul. 31, 2017	Mar. 31, 2019	Dec. 31, 2019
Jeffrey Energy Center (JEC)
Variable Interest Entity [Line Items]
VIE ownership percentage	8.00%	8.00%	8.00%	8.00%
La Cygne Unit 2
Variable Interest Entity [Line Items]
VIE ownership percentage				50.00%
Evergy Kansas Central \| Jeffrey Energy Center (JEC)
Variable Interest Entity [Line Items]
VIE ownership percentage	8.00%
Evergy Kansas Central \| La Cygne Unit 2
Variable Interest Entity [Line Items]
VIE ownership percentage				50.00%

VARIABLE INTEREST ENTITIES - Assets and Liabilities Related to VIE (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets:
Property, plant and equipment of variable interest entities, net	$ 19,184.4	$ 18,782.5
Liabilities:
Current maturities of long-term debt of variable interest entities	251.1	705.4
Accrued interest	122.3	110.9
Long-term debt, net	8,746.7	6,636.3
Variable Interest Entities
Assets:
Property, plant and equipment of variable interest entities, net	162.0	169.2
Liabilities:
Current maturities of long-term debt of variable interest entities	32.3	30.3
Accrued interest	0.3	0.5
Long-term debt, net	18.8	51.1
Evergy Kansas Central
Assets:
Property, plant and equipment of variable interest entities, net	9,864.9	9,718.3
Liabilities:
Current maturities of long-term debt of variable interest entities	250.0	300.0
Accrued interest	74.2	74.4
Long-term debt, net	3,436.1	3,389.8
Evergy Kansas Central \| Variable Interest Entities
Assets:
Property, plant and equipment of variable interest entities, net	162.0	169.2
Liabilities:
Current maturities of long-term debt of variable interest entities	32.3	30.3
Accrued interest	0.3	0.5
Long-term debt, net	$ 18.8	$ 51.1

TAXES - Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income taxes
Federal	$ (39.5)	$ (67.4)	$ 0.1
State	15.0	2.2	0.4
Total	(24.5)	(65.2)	0.5
Deferred income taxes
Federal	93.2	160.1	122.8
State	27.5	(32.3)	30.7
Total	120.7	127.8	153.5
Investment tax credit
Deferral	5.2	0.0	0.0
Investment tax credit amortization	(4.4)	(3.6)	(2.8)
Total	0.8	(3.6)	(2.8)
Income tax expense	$ 97.0	$ 59.0	$ 151.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Effect of:
COLI policies	(1.80%)	(1.90%)	(3.10%)
State income taxes	5.00%	4.90%	4.10%
Flow through depreciation for plant-related differences	(4.50%)	0.80%	2.30%
Federal tax credits	(4.90%)	(6.40%)	(6.90%)
Non-controlling interest	(0.40%)	(0.40%)	(0.90%)
AFUDC equity	(0.10%)	(0.10%)	(0.20%)
Amortization of federal investment tax credits	(0.50%)	(0.60%)	(0.60%)
Changes in uncertain tax positions, net	(0.20%)	0.10%	0.00%
Federal or state tax rate change	0.00%	(8.70%)	2.50%
Valuation allowance	(1.00%)	0.40%	0.30%
Stock compensation	0.10%	(0.40%)	(0.90%)
Officer compensation limitation	0.10%	1.20%	0.20%
Other	(0.40%)	(0.20%)	(0.80%)
Effective income tax rate	12.40%	9.70%	31.00%
Evergy Kansas Central
Current income taxes
Federal	$ 37.9	$ (0.3)	$ 0.1
State	2.6	(1.8)	0.4
Total	40.5	(2.1)	0.5
Deferred income taxes
Federal	(8.9)	43.5	122.8
State	18.4	(42.9)	30.7
Total	9.5	0.6	153.5
Investment tax credit
Deferral	5.2	0.0	0.0
Investment tax credit amortization	(3.1)	(2.8)	(2.8)
Total	2.1	(2.8)	(2.8)
Income tax expense	$ 52.1	$ (4.3)	$ 151.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Effect of:
COLI policies	(3.30%)	(3.30%)	(3.10%)
State income taxes	5.30%	5.00%	4.10%
Flow through depreciation for plant-related differences	(0.10%)	1.60%	2.30%
Federal tax credits	(7.40%)	(10.40%)	(6.90%)
Non-controlling interest	(0.80%)	(0.60%)	(0.90%)
AFUDC equity	(0.10%)	(0.20%)	(0.20%)
Amortization of federal investment tax credits	(0.70%)	(0.80%)	(0.60%)
Changes in uncertain tax positions, net	(0.40%)	0.10%	0.00%
Federal or state tax rate change	0.00%	(15.30%)	2.50%
Valuation allowance	(0.40%)	0.50%	0.30%
Stock compensation	(0.10%)	(0.80%)	(0.90%)
Officer compensation limitation	0.00%	1.80%	0.20%
Other	(0.30%)	0.20%	(0.80%)
Effective income tax rate	12.70%	(1.20%)	31.00%
Evergy Metro
Current income taxes
Federal	$ 43.9	$ 29.8	$ 37.4
State	22.4	8.9	8.3
Total	66.3	38.7	45.7
Deferred income taxes
Federal	(24.5)	(3.4)	74.7
State	(5.0)	53.0	8.8
Total	(29.5)	49.6	83.5
Investment tax credit
Investment tax credit amortization	(1.1)	(1.0)	(1.0)
Total	(1.1)	(1.0)	(1.0)
Income tax expense	$ 35.7	$ 87.3	$ 128.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Effect of:
COLI policies	(0.20%)	(0.20%)	(0.30%)
State income taxes	4.70%	5.50%	3.80%
Flow through depreciation for plant-related differences	(9.40%)	(2.50%)	0.50%
Federal tax credits	(2.50%)	(2.10%)	(2.40%)
AFUDC equity	(0.20%)	(0.10%)	(0.70%)
Amortization of federal investment tax credits	(0.40%)	(0.40%)	(0.30%)
Federal or state tax rate change	0.00%	14.10%	5.30%
Valuation allowance	0.00%	0.00%	0.40%
Stock compensation	0.00%	0.00%	0.20%
Officer compensation limitation	0.30%	0.60%	0.10%
Other	(1.00%)	(1.00%)	0.00%
Effective income tax rate	12.30%	34.90%	41.60%

TAXES - Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Tax credit carryforward	$ 548.9	$ 508.1
Income taxes refundable to customers, net	466.3	478.1
Deferred employee benefit costs	197.0	215.4
Net operating loss carryforward	163.4	383.3
Deferred state income taxes	64.4	62.5
Alternative minimum tax carryforward	37.9	73.4
Accrued liabilities	80.4	82.6
Other	183.2	193.5
Total deferred tax assets before valuation allowance	1,741.5	1,996.9
Valuation allowances	(17.5)	(27.3)
Total deferred tax assets, net	1,724.0	1,969.6
Deferred tax liabilities:
Plant-related	(3,107.1)	(3,164.9)
Deferred employee benefit costs	(173.3)	(199.9)
Acquisition premium	(68.2)	(72.6)
Other	(119.8)	(131.4)
Total deferred tax liabilities	(3,468.4)	(3,568.8)
Net deferred income tax liabilities	(1,744.4)	(1,599.2)
Evergy Kansas Central
Deferred tax assets:
Tax credit carryforward	337.3	307.1
Income taxes refundable to customers, net	234.3	233.1
Deferred employee benefit costs	93.4	89.6
Net operating loss carryforward	23.1	60.7
Deferred state income taxes	64.4	62.5
Alternative minimum tax carryforward	13.4	26.7
Accrued liabilities	14.5	13.6
Other	99.1	101.7
Total deferred tax assets before valuation allowance	879.5	895.0
Valuation allowances	0.0	(1.7)
Total deferred tax assets, net	879.5	893.3
Deferred tax liabilities:
Plant-related	(1,481.7)	(1,491.6)
Deferred employee benefit costs	(93.4)	(89.6)
Acquisition premium	(68.2)	(72.6)
Other	(53.9)	(54.9)
Total deferred tax liabilities	(1,697.2)	(1,708.7)
Net deferred income tax liabilities	(817.7)	(815.4)
Evergy Metro
Deferred tax assets:
Tax credit carryforward	204.4	194.0
Income taxes refundable to customers, net	176.2	186.9
Deferred employee benefit costs	120.4	118.3
Net operating loss carryforward	61.9	119.2
Deferred state income taxes	0.0	0.0
Alternative minimum tax carryforward	0.0	0.0
Accrued liabilities	29.1	32.8
Other	55.1	46.7
Total deferred tax assets before valuation allowance	647.1	697.9
Valuation allowances	0.0	0.0
Total deferred tax assets, net	647.1	697.9
Deferred tax liabilities:
Plant-related	(1,157.0)	(1,199.7)
Deferred employee benefit costs	(79.5)	(86.1)
Acquisition premium	0.0	0.0
Other	(53.4)	(43.9)
Total deferred tax liabilities	(1,289.9)	(1,329.7)
Net deferred income tax liabilities	$ (642.8)	$ (631.8)

TAXES - Net Operating Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	$ 132.4	$ 324.2
Operating loss carryforwards of federal income tax benefit	7.1
Tax credit carryforward, amount	379.0
Federal Alternative Minimum Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	37.9	73.4
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Tax benefits related to NOLs	51.1
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	31.0	59.1
Operating loss carryforwards of federal income tax benefit	10.1
Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	12.3
Tax credit carryforward, amount	168.8
Evergy Kansas Central \| Federal Alternative Minimum Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	13.4	26.7
Evergy Kansas Central \| Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	12.3	40.1
Evergy Kansas Central \| State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	10.8	20.6
Evergy Metro
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	56.2
Tax credit carryforward, amount	203.2
Evergy Metro \| Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	56.2	107.5
Evergy Metro \| State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	5.7	$ 11.7
2005
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	19.1
Tax credit carryforward, amount	0.3
2005 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	0.2
2005 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	0.0
2006
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	32.0
Tax credit carryforward, amount	0.3
2006 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	0.2
2006 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	0.0
2014
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	2.8
Tax credit carryforward, amount	24.1
2014 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.2
Tax credit carryforward, amount	10.7
2014 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.9
Tax credit carryforward, amount	13.0
2015
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	58.8
Tax credit carryforward, amount	24.7
2015 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	10.9
2015 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	55.3
Tax credit carryforward, amount	13.2
2016
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	4.6
Tax credit carryforward, amount	27.1
2016 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	11.0
2016 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	12.4
2017
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	15.1
Tax credit carryforward, amount	43.9
2017 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	12.1
Tax credit carryforward, amount	35.1
2017 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.0
Tax credit carryforward, amount	$ 8.2

TAXES - Valuation Allowance (Details) $ in Millions	12 Months Ended
TAXES - Valuation Allowance (Details) $ in Millions	Dec. 31, 2019 USD ($)
Income Tax Disclosure [Abstract]
Tax benefit	$ 9.8

TAXES - Missouri Tax Reform (Details) - Evergy Metro $ in Millions	Jun. 01, 2018 USD ($)
Operating Loss Carryforwards [Line Items]
Decrease in net deferred income tax liabilities due to tax reform	$ 46.6
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base	28.8
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform	9.9
Income tax benefit from tax reform	$ 15.5

LEASES - Narrative (Details)	12 Months Ended
LEASES - Narrative (Details)	Dec. 31, 2019
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Minimum \| Evergy Kansas Central
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Minimum \| Evergy Metro
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	19 years
Maximum \| Evergy Kansas Central
Lessee, Lease, Description [Line Items]
Remaining lease term	19 years
Maximum \| Evergy Metro
Lessee, Lease, Description [Line Items]
Remaining lease term	26 years

LEASES - Schedule of Lease Expense (Details) $ in Millions	12 Months Ended
LEASES - Schedule of Lease Expense (Details) $ in Millions	Dec. 31, 2019 USD ($)
Finance lease costs
Amortization of right-of-use assets	$ 5.2
Interest on lease liabilities	2.9
Operating lease costs	23.8
Short-term lease costs	4.0
Variable lease costs for renewable purchase power agreements	313.0
Total lease costs	348.9
Evergy Kansas Central
Finance lease costs
Amortization of right-of-use assets	5.0
Interest on lease liabilities	2.7
Operating lease costs	13.2
Short-term lease costs	1.2
Variable lease costs for renewable purchase power agreements	130.8
Total lease costs	152.9
Evergy Metro
Finance lease costs
Amortization of right-of-use assets	0.1
Interest on lease liabilities	0.1
Operating lease costs	9.2
Short-term lease costs	2.6
Variable lease costs for renewable purchase power agreements	129.2
Total lease costs	$ 141.2

LEASES - Supplemental Cash Flow Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 21.7
Operating cash flows from finance leases	2.8
Financing cash flows from finance leases	5.0
Right-of-use assets obtained in exchange for new operating lease liabilities	10.4
Right-of-use assets obtained in exchange for new finance lease liabilities	8.3
Evergy Kansas Central
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	13.7
Operating cash flows from finance leases	2.6
Financing cash flows from finance leases	4.8
Right-of-use assets obtained in exchange for new operating lease liabilities	6.1
Right-of-use assets obtained in exchange for new finance lease liabilities	8.3
Evergy Metro
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	9.9
Operating cash flows from finance leases	0.1
Financing cash flows from finance leases	0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 0.0

LEASES - Schedule of Future Payments for Finance Leases (Details) $ in Millions	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
2020	$ 8.1
2021	7.4
2022	6.7
2023	5.8
2024	4.7
After 2024	46.2
Total finance lease payments	78.9
Amounts representing imputed interest	(26.1)
Present value of lease payments	52.8
Less: current portion	(4.9)
Total long-term obligations under finance leases	47.9
Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$ 302.8
Weighted-average remaining lease term (years)	14 years 3 months 18 days
Weighted-average discount rate	5.60%
Evergy Kansas Central
Lessee, Lease, Description [Line Items]
2020	$ 7.6
2021	7.0
2022	6.2
2023	5.4
2024	4.3
After 2024	44.6
Total finance lease payments	75.1
Amounts representing imputed interest	(25.0)
Present value of lease payments	50.1
Less: current portion	(4.7)
Total long-term obligations under finance leases	45.4
Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$ 43.5
Weighted-average remaining lease term (years)	14 years 7 months 6 days
Weighted-average discount rate	5.50%
Evergy Metro
Lessee, Lease, Description [Line Items]
2020	$ 0.2
2021	0.2
2022	0.2
2023	0.2
2024	0.2
After 2024	0.9
Total finance lease payments	1.9
Amounts representing imputed interest	(0.5)
Present value of lease payments	1.4
Less: current portion	(0.1)
Total long-term obligations under finance leases	1.3
Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$ 1.4
Weighted-average remaining lease term (years)	8 years 8 months 12 days
Weighted-average discount rate	7.60%

LEASES - Lease Payments for Operating Leases (Details) $ in Millions	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
2020	$ 20.5
2021	17.0
2022	14.1
2023	11.0
2024	9.2
After 2024	44.7
Total operating lease payments	116.5
Amounts representing imputed interest	(18.5)
Present value of lease payments	98.0
Less: current portion	(15.6)
Total long-term obligations under operating leases	82.4
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$ 104.5
Weighted-average remaining lease term (years)	8 years 9 months 18 days
Weighted-average discount rate	3.80%
Evergy Kansas Central
Lessee, Lease, Description [Line Items]
2020	$ 11.6
2021	8.6
2022	6.4
2023	3.8
2024	2.3
After 2024	1.5
Total operating lease payments	34.2
Amounts representing imputed interest	(2.3)
Present value of lease payments	31.9
Less: current portion	(9.1)
Total long-term obligations under operating leases	22.8
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$ 39.4
Weighted-average remaining lease term (years)	3 years 9 months 18 days
Weighted-average discount rate	3.40%
Evergy Metro
Lessee, Lease, Description [Line Items]
2020	$ 10.7
2021	10.1
2022	9.3
2023	8.8
2024	8.5
After 2024	82.8
Total operating lease payments	130.2
Amounts representing imputed interest	(35.4)
Present value of lease payments	94.8
Less: current portion	(7.0)
Total long-term obligations under operating leases	87.8
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$ 76.6
Weighted-average remaining lease term (years)	15 years 9 months 18 days
Weighted-average discount rate	4.20%

QUARTERLY OPERATING RESULTS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenue	$ 1,131.6	$ 1,577.6	$ 1,221.7	$ 1,216.9	$ 1,199.8	$ 1,582.5	$ 893.4	$ 600.2	$ 5,147.8	$ 4,275.9	$ 2,571.0
Operating income	165.8	538.7	271.7	209.6	150.1	533.1	126.9	123.5	1,185.8	933.6	678.8
Net income (loss)	66.7	370.9	144.6	103.4	21.1	357.6	104.4	62.9	685.6	546.0	336.5
Net income	$ 63.9	$ 366.8	$ 139.7	$ 99.5	$ 18.5	$ 355.0	$ 101.8	$ 60.5	669.9	535.8	323.9
Basic and diluted earnings per common share (in dollars per share)	$ 0.28	$ 1.56	$ 0.57	$ 0.39	$ 0.07	$ 1.32	$ 0.56	$ 0.42
Evergy Kansas Central
Operating revenue	$ 576.1	$ 749.0	$ 585.5	$ 596.8	$ 599.0	$ 764.8	$ 650.9	$ 600.2	2,507.4	2,614.9	2,571.0
Operating income	102.2	242.4	127.6	124.3	94.0	256.9	76.1	123.5	596.5	550.5	678.8
Net income (loss)	55.4	168.2	67.2	68.3	30.6	178.0	77.6	62.9	359.1	349.1	336.5
Net income	52.6	164.1	62.3	64.4	28.0	175.4	75.0	60.5	343.4	338.9	323.9
Evergy Metro
Operating revenue	375.3	568.8	437.0	425.4	414.2	559.6	452.2	397.1	1,806.5	1,823.1	1,890.7
Operating income	52.2	215.5	101.9	56.9	44.7	189.4	114.7	61.0	426.5	409.8	486.4
Net income (loss)	$ 27.9	$ 151.9	$ 59.4	$ 16.0	$ (2.2)	$ 120.3	$ 24.6	$ 20.2	255.2	162.9	179.8
Net income									$ 255.2	$ 162.9	$ 179.8

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Schedule I Financial Statements of Parent Company Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended								7 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING EXPENSES:
Operating and maintenance											$ 1,218.5	$ 1,115.8	$ 563.5
Total Operating Expenses											3,962.0	3,342.3	1,892.2
INCOME FROM OPERATIONS	$ 165.8	$ 538.7	$ 271.7	$ 209.6	$ 150.1	$ 533.1	$ 126.9	$ 123.5			1,185.8	933.6	678.8
OTHER INCOME (EXPENSE):
Equity in earnings from subsidiaries											9.8	5.4	6.7
Other expense											(76.9)	(78.7)	(39.1)
Total Other Expense, Net											(39.0)	(54.4)	(26.8)
Interest expense											374.0	279.6	171.0
INCOME BEFORE INCOME TAXES											772.8	599.6	481.0
Income tax benefit											(97.0)	(59.0)	(151.2)
Net income attributable to Evergy, Inc.	63.9	366.8	139.7	99.5	18.5	355.0	101.8	60.5			669.9	535.8	323.9
COMPREHENSIVE INCOME
NET INCOME	$ 66.7	$ 370.9	$ 144.6	$ 103.4	$ 21.1	$ 357.6	$ 104.4	$ 62.9			685.6	546.0	336.5
Derivative hedging activity
Loss on derivative hedging instruments										$ (69.8)	(64.4)	(5.4)
Loss on derivative hedging instruments													0.0
Income tax benefit											16.5	1.4
Income tax benefit													0.0
Net loss on derivative hedging instruments											(47.9)	(4.0)
Net loss on derivative hedging instruments													0.0
Reclassification to expenses, net of tax											1.5	0.0
Reclassification to expenses, net of tax													0.0
Derivative hedging activity, net of tax											(46.4)	(4.0)
Derivative hedging activity, net of tax													0.0
Total other comprehensive loss											(47.0)	(3.0)	0.0
COMPREHENSIVE INCOME											622.9	$ 532.8	$ 323.9
Parent
OPERATING EXPENSES:
Operating and maintenance									$ 54.6		19.4
Total Operating Expenses									54.6		19.4
INCOME FROM OPERATIONS									(54.6)		(19.4)
OTHER INCOME (EXPENSE):
Equity in earnings from subsidiaries									364.7		698.2
Investment earnings									26.3		32.7
Other expense									(2.6)		(0.1)
Total Other Expense, Net									388.4		730.8
Interest expense									19.6		60.7
INCOME BEFORE INCOME TAXES									314.2		650.7
Income tax benefit									(10.7)		(13.7)
Net income attributable to Evergy, Inc.									324.9		664.4
Derivative hedging activity
Loss on derivative hedging instruments											(64.4)
Loss on derivative hedging instruments									(5.4)
Income tax benefit											16.5
Income tax benefit									1.4
Net loss on derivative hedging instruments											(47.9)
Net loss on derivative hedging instruments									(4.0)
Reclassification to expenses, net of tax											1.5
Reclassification to expenses, net of tax									0.0
Derivative hedging activity, net of tax											(46.4)
Derivative hedging activity, net of tax									(4.0)
Other comprehensive income from subsidiaries, net									1.0		(0.6)
Total other comprehensive loss									(3.0)		(47.0)
COMPREHENSIVE INCOME									$ 321.9		$ 617.4

Schedule I Financial Statements of Parent Company Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 23.2	$ 160.3
Income taxes receivable	85.5	68.0
Prepaid expenses and other assets	78.2	79.1
Total Current Assets	1,467.7	1,681.0
OTHER ASSETS:
Other	511.5	396.5
Total Other Assets	5,161.8	4,965.4
TOTAL ASSETS	25,975.9	25,598.1
CURRENT LIABILITIES:
Accrued interest	122.3	110.9
Other	220.8	171.9
Total Current Liabilities	2,335.9	2,867.2
LONG-TERM LIABILITIES:
Long-term debt, net	8,746.7	6,636.3
Other	340.7	236.7
Total Long-Term Liabilities	15,094.7	12,740.2
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value, 226,641,443 shares issued	7,070.4	8,685.2
Retained earnings	1,551.5	1,346.0
Accumulated other comprehensive loss	(50.0)	(3.0)
Total Evergy, Inc. Shareholders' Equity	8,571.9	10,028.2
TOTAL LIABILITIES AND EQUITY	25,975.9	25,598.1
Parent
CURRENT ASSETS:
Cash and cash equivalents	11.6	107.1
Accounts receivable from subsidiaries	24.5	35.2
Notes receivable from subsidiaries	2.0	2.0
Income taxes receivable	8.0	0.2
Prepaid expenses and other assets	2.4	2.0
Total Current Assets	48.5	146.5
OTHER ASSETS:
Investment in subsidiaries	10,023.1	9,785.6
Note receivable from subsidiaries	634.9	634.9
Deferred income taxes	34.2	36.3
Other	0.9	1.1
Total Other Assets	10,693.1	10,457.9
TOTAL ASSETS	10,741.6	10,604.4
CURRENT LIABILITIES:
Notes payable	20.0	0.0
Related party payables	13.1	28.1
Accrued interest	14.6	2.1
Derivative instruments	0.0	5.4
Other	8.1	6.3
Total Current Liabilities	55.8	41.9
LONG-TERM LIABILITIES:
Long-term debt, net	2,223.7	638.1
Other	16.9	17.6
Total Long-Term Liabilities	2,240.6	655.7
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value, 226,641,443 shares issued	7,053.7	8,668.3
Retained earnings	1,441.5	1,241.5
Accumulated other comprehensive loss	(50.0)	(3.0)
Total Evergy, Inc. Shareholders' Equity	8,445.2	9,906.8
TOTAL LIABILITIES AND EQUITY	$ 10,741.6	$ 10,604.4

Schedule I Financial Statements of Parent Company Balance Sheet Parenthetical (Details) - shares	Dec. 31, 2019	Dec. 31, 2018
Condensed Balance Sheet Statements, Captions [Line Items]
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	226,641,443	255,326,252
Parent
Condensed Balance Sheet Statements, Captions [Line Items]
Common stock, shares authorized (in shares)	600,000,000
Common stock, shares issued (in shares)	255,326,252

Schedule I Financial Statements of Parent Company Statement of Cash Flows (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								7 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income		$ 63.9	$ 366.8	$ 139.7	$ 99.5	$ 18.5	$ 355.0	$ 101.8	$ 60.5		$ 669.9	$ 535.8	$ 323.9
Adjustments to reconcile income to net cash from operating activities:
Non-cash compensation											16.3	29.9	8.8
Net deferred income taxes and credits											121.5	124.2	149.6
Equity in earnings from subsidiaries											(9.8)	(5.4)	(6.7)
Other											(3.2)	(5.2)	(8.7)
Changes in working capital items:
Prepaid expenses and other current assets											43.4	(128.1)	55.8
Accrued taxes											(8.2)	(76.4)	9.2
Other current liabilities											(59.4)	92.0	(118.0)
Changes in other assets											79.8	66.8	32.0
Changes in other liabilities											(75.5)	(15.9)	19.3
Cash Flows from Operating Activities											1,749.0	1,497.8	912.7
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Cash acquired from the merger with Great Plains Energy											0.0	1,154.2	0.0
Proceeds from settlement of interest rate swap											0.0	140.6	0.0
Cash Flows from (used in) Investing Activities											(1,080.3)	197.4	(780.8)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net											(176.7)	(104.0)	(91.3)
Proceeds from long-term debt											2,372.7	290.9	296.2
Payment for settlement of interest rate swap accounted for as a cash flow hedge	$ (69.8)										(69.8)	0.0	0.0
Cash dividends paid											(462.5)	(475.0)	(223.1)
Repurchase of common stock											(1,628.7)	(1,042.3)	0.0
Other financing activities											(6.7)	(21.3)	(9.9)
Cash Flows from (used in) Financing Activities											(805.8)	(1,538.4)	(131.6)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH											(137.1)	156.8	0.3
Beginning of period					160.3				$ 3.5		160.3	3.5	3.2
End of period		23.2				160.3				$ 160.3	23.2	160.3	$ 3.5
Parent
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income										324.9	664.4
Adjustments to reconcile income to net cash from operating activities:
Non-cash compensation										10.0	16.3
Net deferred income taxes and credits										(6.3)	21.4
Equity in earnings from subsidiaries										(364.7)	(698.2)
Other										0.0	2.1
Changes in working capital items:
Accounts receivable from subsidiaries										(8.5)	8.9
Income taxes receivable										(0.2)	(7.8)
Prepaid expenses and other current assets										(1.0)	(0.1)
Accounts payable to subsidiaries										4.7	(15.0)
Accrued taxes										(35.2)	0.0
Accrued interest										(13.6)	12.5
Other current liabilities										2.4	1.7
Cash dividends from subsidiaries										236.0	460.0
Changes in other assets										0.1	0.2
Changes in other liabilities										20.0	(3.5)
Cash Flows from Operating Activities										168.6	462.9
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Cash acquired from the merger with Great Plains Energy										1,142.2	0.0
Proceeds from settlement of interest rate swap										140.6	0.0
Cash Flows from (used in) Investing Activities										1,282.8	0.0
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net										(56.1)	20.0
Proceeds from long-term debt										0.0	1,585.0
Payment for settlement of interest rate swap accounted for as a cash flow hedge										0.0	(69.8)
Cash dividends paid										(245.9)	(462.5)
Repurchase of common stock										(1,042.3)	(1,628.7)
Other financing activities										0.0	(2.4)
Cash Flows from (used in) Financing Activities										(1,344.3)	(558.4)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH										107.1	(95.5)
Beginning of period					$ 107.1					0.0	107.1
End of period		$ 11.6				$ 107.1				$ 107.1	$ 11.6	$ 107.1

Schedule I Financial Statements of Parent Company Schedule I Financial Statements of Parent Company - Dividends (Details) - USD ($) $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Parent
Condensed Financial Statements, Captions [Line Items]
Cash dividends from subsidiaries	$ 236.0	$ 460.0

Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for uncollectible accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	$ 9.2	$ 6.7	$ 6.7
Additions Charged To Costs And Expenses	27.2	20.7	10.5
Additions Charged To Other Accounts	12.4	16.9	7.0
Deductions	38.3	35.1	17.5
Balance At End Of Period	10.5	9.2	6.7
Allowance for uncollectible accounts \| Evergy Kansas Central
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	3.9	6.7	6.7
Additions Charged To Costs And Expenses	7.2	9.0	10.5
Additions Charged To Other Accounts	3.4	7.4	7.0
Deductions	10.7	19.2	17.5
Balance At End Of Period	3.8	3.9	6.7
Allowance for uncollectible accounts \| Evergy Metro
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	3.8	2.2	1.8
Additions Charged To Costs And Expenses	13.7	13.1	7.5
Additions Charged To Other Accounts	6.3	4.4	5.6
Deductions	19.2	15.9	12.7
Balance At End Of Period	4.6	3.8	2.2
Tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	27.3	0.0
Additions Charged To Costs And Expenses	0.6	2.2
Additions Charged To Other Accounts	0.0	26.8
Deductions	10.4	1.7
Balance At End Of Period	17.5	27.3	0.0
Tax valuation allowance \| Evergy Kansas Central
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	1.7	0.0
Additions Charged To Costs And Expenses	0.0	1.7
Additions Charged To Other Accounts	0.0	0.0
Deductions	1.7	0.0
Balance At End Of Period	$ 0.0	1.7	0.0
Tax valuation allowance \| Evergy Metro
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period		$ 0.0	0.0
Additions Charged To Costs And Expenses			1.2
Additions Charged To Other Accounts			0.0
Deductions			1.2
Balance At End Of Period			$ 0.0

Label	Element	Value
Accounting Standards Update 2016-09 [Member] \| Evergy Metro Inc [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (700,000)
Accounting Standards Update 2016-09 [Member] \| Retained Earnings [Member] \| Evergy Metro Inc [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (700,000)

PENSION PLANS AND POST-RETIREMENT BENEFITS - Target Asset Allocations (Details)	Dec. 31, 2019
Evergy Kansas Central \| Pension Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	29.00%
Evergy Kansas Central \| Pension Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	20.00%
Evergy Kansas Central \| Pension Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	36.00%
Evergy Kansas Central \| Pension Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central \| Pension Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	4.00%
Evergy Kansas Central \| Pension Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	11.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	33.00%
Evergy Kansas Central \| Post-Retirement Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	22.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	45.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro Inc \| Pension Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	31.00%
Evergy Metro Inc \| Pension Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	21.00%
Evergy Metro Inc \| Pension Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	35.00%
Evergy Metro Inc \| Pension Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro Inc \| Pension Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	6.00%
Evergy Metro Inc \| Pension Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	7.00%
Evergy Metro Inc \| Post-Retirement Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	3.00%
Evergy Metro Inc \| Post-Retirement Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro Inc \| Post-Retirement Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	85.00%
Evergy Metro Inc \| Post-Retirement Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	4.00%
Evergy Metro Inc \| Post-Retirement Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro Inc \| Post-Retirement Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	8.00%

FAIR VALUE MEASUREMENTS - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Total nuclear decommissioning trust	$ 573.2	$ 472.1
Total rabbi trust	45.5	43.8
Total self-insured health plan trust	9.9	12.4
Total Assets	628.6	528.3
Liabilities
Interest rate swaps		5.4
Total		5.4
Level 1
Assets
Total nuclear decommissioning trust	493.0	396.0
Total rabbi trust	0.6	0.2
Total self-insured health plan trust	4.6	8.8
Total Assets	498.2	405.0
Liabilities
Interest rate swaps		0.0
Total		0.0
Level 2
Assets
Total nuclear decommissioning trust	36.2	33.5
Total rabbi trust	0.0	0.0
Total self-insured health plan trust	5.3	3.6
Total Assets	41.5	37.1
Liabilities
Interest rate swaps		5.4
Total		5.4
Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	0.0	0.0
Liabilities
Interest rate swaps		0.0
Total		0.0
NAV
Assets
Total nuclear decommissioning trust	44.0	42.6
Total rabbi trust	44.9	43.6
Total self-insured health plan trust	0.0	0.0
Total Assets	88.9	86.2
Liabilities
Interest rate swaps		0.0
Total		0.0
Evergy Kansas Central
Assets
Total nuclear decommissioning trust	272.5	227.5
Total rabbi trust	31.7	30.6
Total Assets	304.2	258.1
Evergy Kansas Central \| Core bond fund
Assets
Total nuclear decommissioning trust	39.3	37.5
Total rabbi trust	25.3	24.8
Evergy Kansas Central \| High-yield bond fund
Assets
Total nuclear decommissioning trust	22.3	18.9
Evergy Kansas Central \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	19.4	15.4
Evergy Kansas Central \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	16.4	12.9
Total rabbi trust	6.3	5.6
Evergy Kansas Central \| Alternative investments fund
Assets
Total nuclear decommissioning trust	23.9	24.1
Evergy Kansas Central \| Real estate securities fund
Assets
Total nuclear decommissioning trust	12.6	11.8
Evergy Kansas Central \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.5	0.1
Total rabbi trust	0.1	0.2
Evergy Kansas Central \| Level 1
Assets
Total nuclear decommissioning trust	228.5	184.9
Total rabbi trust	0.1	0.2
Total Assets	228.6	185.1
Evergy Kansas Central \| Level 1 \| Core bond fund
Assets
Total nuclear decommissioning trust	39.3	37.5
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| High-yield bond fund
Assets
Total nuclear decommissioning trust	22.3	18.9
Evergy Kansas Central \| Level 1 \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	19.4	15.4
Evergy Kansas Central \| Level 1 \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	16.4	12.9
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.5	0.1
Total rabbi trust	0.1	0.2
Evergy Kansas Central \| Level 2
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Kansas Central \| Level 2 \| Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Kansas Central \| Level 3 \| Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| NAV
Assets
Total nuclear decommissioning trust	44.0	42.6
Total rabbi trust	31.6	30.4
Total Assets	75.6	73.0
Evergy Kansas Central \| NAV \| Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	25.3	24.8
Evergy Kansas Central \| NAV \| High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| NAV \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| NAV \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	6.3	5.6
Evergy Kansas Central \| NAV \| Alternative investments fund
Assets
Total nuclear decommissioning trust	23.9	24.1
Evergy Kansas Central \| NAV \| Real estate securities fund
Assets
Total nuclear decommissioning trust	12.6	11.8
Evergy Kansas Central \| NAV \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Domestic \| Equity securities
Assets
Total nuclear decommissioning trust	86.1	70.6
Evergy Kansas Central \| Domestic \| Level 1 \| Equity securities
Assets
Total nuclear decommissioning trust	78.6	63.9
Evergy Kansas Central \| Domestic \| Level 2 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Domestic \| Level 3 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Domestic \| NAV \| Equity securities
Assets
Total nuclear decommissioning trust	7.5	6.7
Evergy Kansas Central \| International \| Equity securities
Assets
Total nuclear decommissioning trust	52.0	36.2
Evergy Kansas Central \| International \| Level 1 \| Equity securities
Assets
Total nuclear decommissioning trust	52.0	36.2
Evergy Kansas Central \| International \| Level 2 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| International \| Level 3 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| International \| NAV \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro
Assets
Total nuclear decommissioning trust	300.7	244.6
Total self-insured health plan trust	9.9	12.4
Total Assets	310.6	257.0
Evergy Metro \| Equity securities
Assets
Total nuclear decommissioning trust	211.1	166.6
Total self-insured health plan trust	0.5	0.5
Evergy Metro \| Cash equivalents
Assets
Total nuclear decommissioning trust	3.1	1.7
Evergy Metro \| U.S. Treasury
Assets
Total nuclear decommissioning trust	50.3	42.1
Evergy Metro \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.4	0.4
Evergy Metro \| State and local obligations
Assets
Total nuclear decommissioning trust	2.2	2.1
Evergy Metro \| Corporate bonds
Assets
Total nuclear decommissioning trust	33.2	30.9
Evergy Metro \| Foreign governments
Assets
Total nuclear decommissioning trust	0.1	0.1
Evergy Metro \| Other
Assets
Total nuclear decommissioning trust	0.3	0.7
Evergy Metro \| Debt securities
Assets
Total self-insured health plan trust	6.7	3.9
Evergy Metro \| Cash and cash equivalents
Assets
Total self-insured health plan trust	2.7	8.0
Evergy Metro \| Level 1
Assets
Total nuclear decommissioning trust	264.5	211.1
Total self-insured health plan trust	4.6	8.8
Total Assets	269.1	219.9
Evergy Metro \| Level 1 \| Equity securities
Assets
Total nuclear decommissioning trust	211.1	166.6
Total self-insured health plan trust	0.5	0.5
Evergy Metro \| Level 1 \| Cash equivalents
Assets
Total nuclear decommissioning trust	3.1	1.7
Evergy Metro \| Level 1 \| U.S. Treasury
Assets
Total nuclear decommissioning trust	50.3	42.1
Evergy Metro \| Level 1 \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| Other
Assets
Total nuclear decommissioning trust	0.0	0.7
Evergy Metro \| Level 1 \| Debt securities
Assets
Total self-insured health plan trust	1.4	0.3
Evergy Metro \| Level 1 \| Cash and cash equivalents
Assets
Total self-insured health plan trust	2.7	8.0
Evergy Metro \| Level 2
Assets
Total nuclear decommissioning trust	36.2	33.5
Total self-insured health plan trust	5.3	3.6
Total Assets	41.5	37.1
Evergy Metro \| Level 2 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 2 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 2 \| U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 2 \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.4	0.4
Evergy Metro \| Level 2 \| State and local obligations
Assets
Total nuclear decommissioning trust	2.2	2.1
Evergy Metro \| Level 2 \| Corporate bonds
Assets
Total nuclear decommissioning trust	33.2	30.9
Evergy Metro \| Level 2 \| Foreign governments
Assets
Total nuclear decommissioning trust	0.1	0.1
Evergy Metro \| Level 2 \| Other
Assets
Total nuclear decommissioning trust	0.3	0.0
Evergy Metro \| Level 2 \| Debt securities
Assets
Total self-insured health plan trust	5.3	3.6
Evergy Metro \| Level 2 \| Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Metro \| Level 3 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 3 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Other
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Debt securities
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 3 \| Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| NAV
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Metro \| NAV \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| NAV \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Other
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Debt securities
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| NAV \| Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Other Evergy
Assets
Total rabbi trust	13.8	13.2
Liabilities
Interest rate swaps		5.4
Total		5.4
Other Evergy \| Cash and cash equivalents
Assets
Total rabbi trust	0.5
Other Evergy \| Fixed income fund
Assets
Total rabbi trust	13.3	13.2
Other Evergy \| Level 1
Assets
Total rabbi trust	0.5	0.0
Liabilities
Interest rate swaps		0.0
Total		0.0
Other Evergy \| Level 1 \| Cash and cash equivalents
Assets
Total rabbi trust	0.5
Other Evergy \| Level 1 \| Fixed income fund
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 2
Assets
Total rabbi trust	0.0	0.0
Liabilities
Interest rate swaps		5.4
Total		5.4
Other Evergy \| Level 2 \| Cash and cash equivalents
Assets
Total rabbi trust	0.0
Other Evergy \| Level 2 \| Fixed income fund
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 3
Assets
Total rabbi trust	0.0	0.0
Liabilities
Interest rate swaps		0.0
Total		0.0
Other Evergy \| Level 3 \| Cash and cash equivalents
Assets
Total rabbi trust	0.0
Other Evergy \| Level 3 \| Fixed income fund
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| NAV
Assets
Total rabbi trust	13.3	13.2
Liabilities
Interest rate swaps		0.0
Total		0.0
Other Evergy \| NAV \| Cash and cash equivalents
Assets
Total rabbi trust	0.0
Other Evergy \| NAV \| Fixed income fund
Assets
Total rabbi trust	$ 13.3	$ 13.2

TAXES - Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	$ 379.0
Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	168.8
Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	203.2
General Business Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	379.0	$ 333.8
Amount of tax credit acquired in business combination	0.4
Valuation allowance	0.3
General Business Tax Credit Carryforward \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	168.8	134.0
General Business Tax Credit Carryforward \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	203.2	192.8
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	169.9	174.3
State and Local Jurisdiction \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	168.5	173.1
State and Local Jurisdiction \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	1.2	$ 1.2
2000
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	7.3
2000 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	7.3
2000 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2001
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	9.7
2001 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	9.7
2001 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2002
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.3
2002 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.2
2002 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2003
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.3
2003 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.2
2003 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2004
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.3
2004 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.2
2004 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2005
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.3
2005 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.2
2005 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2006
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.3
2006 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.2
2006 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2007
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.6
2007 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.6
2007 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2008
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	39.8
2008 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.5
2008 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	38.9
2009
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	47.7
2009 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.2
2009 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	47.4
2010
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	18.4
2010 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2010 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	18.2
2011
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.3
2011 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2011 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.2
2012
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	14.4
2012 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	3.6
2012 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	10.7
2013
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	24.3
2013 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	11.3
2013 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	12.9
2014
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	24.1
2014 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	10.7
2014 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.0
2015
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	24.7
2015 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	10.9
2015 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.2
2016
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	27.1
2016 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	11.0
2016 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	12.4
2017
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	43.9
2017 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	35.1
2017 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	8.2
2018
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	43.9
2018 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	36.3
2018 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	7.5
2019
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	38.3
2019 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	30.6
2019 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	$ 7.6