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Consolidated Statements of Comprehensive Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]      
OPERATING REVENUES $ 5,508.2 $ 5,859.1 $ 5,586.7
OPERATING EXPENSES:      
Fuel and purchased power 1,494.8 1,821.2 1,557.0
SPP network transmission costs 302.6 323.0 290.4
Operating and maintenance 945.3 1,085.3 1,107.5
Depreciation and amortization 1,076.5 929.4 896.4
Taxes other than income tax 406.6 398.1 380.5
Sibley Unit 3 impairment loss and other regulatory disallowances 0.0 34.9 0.0
Total Operating Expenses 4,225.8 4,591.9 4,231.8
INCOME FROM OPERATIONS 1,282.4 1,267.2 1,354.9
OTHER INCOME (EXPENSE):      
Investment earnings 29.7 9.4 59.9
Other income 40.6 29.9 46.3
Other expense (75.1) (97.3) (87.4)
Total Other Expense, Net (4.8) (58.0) 18.8
Interest expense 525.8 404.0 372.6
INCOME BEFORE INCOME TAXES 751.8 805.2 1,001.1
Income tax expense 15.6 47.5 117.4
Equity in earnings of equity method investees, net of income taxes 7.4 7.3 8.2
NET INCOME 743.6 765.0 891.9
Less: Net income attributable to noncontrolling interests 12.3 12.3 12.2
Net income attributable to Evergy, Inc. $ 731.3 $ 752.7 $ 879.7
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) $ 3.18 $ 3.27 $ 3.84
Diluted earnings per common share (in dollars per share) $ 3.17 $ 3.27 $ 3.83
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]      
Basic (in shares) 230.0 229.9 229.0
Diluted (in shares) 230.5 230.3 229.6
COMPREHENSIVE INCOME      
NET INCOME $ 743.6 $ 765.0 $ 891.9
Derivative hedging activity      
Reclassification to expenses, net of tax 5.4 5.5 5.5
Derivative hedging activity, net of tax 5.4 5.5 5.5
Defined benefit pension plans      
Net gain (loss) arising during period (0.5) 5.0 (0.1)
Income tax (expense) benefit 0.1 (1.2) 0.0
Net gain (loss) arising during period, net of tax (0.4) 3.8 (0.1)
Amortization of net (gains) losses included in net periodic benefit costs, net of tax (0.1) 0.2 0.0
Change in unrecognized pension expense, net of tax (0.5) 4.0 (0.1)
Total other comprehensive income 4.9 9.5 5.4
COMPREHENSIVE INCOME 748.5 774.5 897.3
Less:  Comprehensive income attributable to noncontrolling interest 12.3 12.3 12.2
Comprehensive Income, Net of Tax, Attributable to Parent, Total $ 736.2 $ 762.2 $ 885.1