Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
OPERATING REVENUES	$ 1,446.5	$ 1,236.2	$ 2,670.4	$ 2,848.1
OPERATING EXPENSES:
Fuel and purchased power	414.3	284.1	723.3	919.2
SPP network transmission costs	81.5	73.8	160.2	143.2
Operating and maintenance	282.8	259.9	535.0	535.4
Depreciation and amortization	232.1	225.2	461.1	444.5
Taxes other than income tax	100.3	97.9	202.2	192.8
Total Operating Expenses	1,111.0	940.9	2,081.8	2,235.1
INCOME FROM OPERATIONS	335.5	295.3	588.6	613.0
OTHER INCOME (EXPENSE):
Investment earnings (loss)	(0.9)	8.4	(10.5)	10.0
Other income	5.9	14.7	14.1	25.9
Other expense	(22.9)	(18.8)	(47.8)	(39.7)
Total Other Income (Expense), Net	(17.9)	4.3	(44.2)	(3.8)
Interest expense	99.3	93.8	191.1	187.8
INCOME BEFORE INCOME TAXES	218.3	205.8	353.3	421.4
Income tax expense	22.1	19.6	33.6	42.6
Equity in earnings of equity method investees, net of income taxes	1.4	2.1	3.5	4.1
NET INCOME	197.6	188.3	323.2	382.9
Less: Net income attributable to noncontrolling interests	3.1	3.0	6.2	6.0
Net income attributable to Evergy, Inc.	$ 194.5	$ 185.3	$ 317.0	$ 376.9
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)	$ 0.85	$ 0.81	$ 1.38	$ 1.65
Diluted earnings per common share (in dollars per share)	$ 0.84	$ 0.81	$ 1.38	$ 1.65
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	229.9	229.3	229.8	228.3
Diluted (in shares)	230.4	229.7	230.4	228.7
COMPREHENSIVE INCOME
NET INCOME	$ 197.6	$ 188.3	$ 323.2	$ 382.9
Derivative hedging activity
Reclassification to expenses, net of tax	1.3	1.4	2.7	2.8
Derivative hedging activity, net of tax	1.3	1.4	2.7	2.8
Defined benefit pension plans
Amortization of net losses included in net periodic benefit costs, net of tax	0.1	0.0	0.1	0.0
Change in unrecognized pension expense, net of tax	0.1	0.0	0.1	0.0
Total other comprehensive income	1.4	1.4	2.8	2.8
COMPREHENSIVE INCOME	199.0	189.7	326.0	385.7
Less:  Comprehensive income attributable to noncontrolling interest	3.1	3.0	6.2	6.0
COMPREHENSIVE INCOME	$ 195.9	$ 186.7	$ 319.8	$ 379.7