Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
OPERATING REVENUES	$ 1,909.1	$ 1,616.5	$ 4,579.5	$ 4,464.6
OPERATING EXPENSES:
Fuel and purchased power	643.0	355.8	1,366.3	1,275.0
SPP network transmission costs	81.6	73.6	241.8	216.8
Operating and maintenance	266.2	265.2	801.2	800.6
Depreciation and amortization	233.2	225.0	694.3	669.5
Taxes other than income tax	100.7	96.2	302.9	289.0
Estimated impairment loss on Sibley Unit 3	6.0	0.0	6.0	0.0
Total Operating Expenses	1,330.7	1,015.8	3,412.5	3,250.9
INCOME FROM OPERATIONS	578.4	600.7	1,167.0	1,213.7
OTHER INCOME (EXPENSE):
Investment earnings	13.1	8.8	2.6	18.8
Other income	6.2	11.0	20.3	36.9
Other expense	(16.7)	(19.2)	(64.5)	(58.9)
Total Other Income (Expense), Net	2.6	0.6	(41.6)	(3.2)
Interest expense	102.3	93.6	293.4	281.4
INCOME BEFORE INCOME TAXES	478.7	507.7	832.0	929.1
Income tax expense	49.5	57.2	83.1	99.8
Equity in earnings of equity method investees, net of income taxes	2.0	2.0	5.5	6.1
NET INCOME	431.2	452.5	754.4	835.4
Less: Net income attributable to noncontrolling interests	3.0	3.1	9.2	9.1
Net income attributable to Evergy, Inc.	$ 428.2	$ 449.4	$ 745.2	$ 826.3
BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO EVERGY, INC. (see Note 1)
Basic earnings per common share (in dollars per share)	$ 1.86	$ 1.96	$ 3.24	$ 3.61
Diluted earnings per common share (in dollars per share)	$ 1.86	$ 1.95	$ 3.23	$ 3.60
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	229.9	229.7	229.9	228.8
Diluted (in shares)	230.6	230.2	230.5	229.3
COMPREHENSIVE INCOME
NET INCOME	$ 431.2	$ 452.5	$ 754.4	$ 835.4
Derivative hedging activity
Reclassification to expenses, net of tax	1.4	1.3	4.1	4.1
Derivative hedging activity, net of tax	1.4	1.3	4.1	4.1
Defined benefit pension plans
Amortization of net losses included in net periodic benefit costs, net of tax	0.0	0.0	0.1	0.0
Change in unrecognized pension expense, net of tax	0.0	0.0	0.1	0.0
Total other comprehensive income	1.4	1.3	4.2	4.1
COMPREHENSIVE INCOME	432.6	453.8	758.6	839.5
Less:  Comprehensive income attributable to noncontrolling interest	3.0	3.1	9.2	9.1
COMPREHENSIVE INCOME	$ 429.6	$ 450.7	$ 749.4	$ 830.4