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TAXES - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current Federal Tax Expense (Benefit) $ 25.3 $ 31.9 $ 15.6
Current State and Local Tax Expense (Benefit) 6.9 8.3 (0.4)
Current Income Tax Expense (Benefit), Total 32.2 40.2 15.2
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Deferred Federal Income Tax Expense (Benefit) 10.2 17.2 92.8
Deferred State and Local Income Tax Expense (Benefit) (21.7) (3.4) 14.7
Deferred Income Tax Expense (Benefit), Total (11.5) 13.8 107.5
Investment Tax Credits      
Deferral 2.2 0.0 0.4
Investment tax credit amortization (7.3) (6.5) (5.7)
Total (5.1) (6.5) (5.3)
Income Tax Expense (Benefit), Total $ 15.6 $ 47.5 $ 117.4
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Effect Of [Abstract]      
COLI policies (1.90%) (1.20%) (1.00%)
State income taxes (1.90%) 0.30% 1.00%
Flow through depreciation for plant-related differences (8.00%) (8.40%) (5.40%)
Federal tax credits (6.20%) (4.00%) (2.80%)
Non-controlling interest (0.30%) (0.30%) (0.30%)
AFUDC equity (0.30%) (0.60%) (0.60%)
Amortization of federal investment tax credits (0.70%) (0.60%) (0.40%)
Valuation allowance 0.40% 0.00% 0.00%
Stock compensation 0.00% (0.20%) 0.00%
Officer compensation limitation 0.30% 0.30% 0.50%
Other (0.40%) (0.50%) (0.40%)
Effective Income Tax Rate Reconciliation, Percent, Total 2.00% 5.80% 11.60%
Evergy Kansas Central      
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current Federal Tax Expense (Benefit) $ 27.8 $ 95.8 $ 53.3
Current State and Local Tax Expense (Benefit) 4.7 3.9 (0.2)
Current Income Tax Expense (Benefit), Total 32.5 99.7 53.1
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Deferred Federal Income Tax Expense (Benefit) (29.3) (78.7) 3.8
Deferred State and Local Income Tax Expense (Benefit) (7.4) (4.6) (1.2)
Deferred Income Tax Expense (Benefit), Total (36.7) (83.3) 2.6
Investment Tax Credits      
Deferral 2.2 0.0 0.3
Investment tax credit amortization (3.9) (4.1) (4.3)
Total (1.7) (4.1) (4.0)
Income Tax Expense (Benefit), Total $ (5.9) $ 12.3 $ 51.7
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Effect Of [Abstract]      
COLI policies (3.60%) (2.20%) (1.70%)
State income taxes (1.00%) (0.40%) (0.40%)
Flow through depreciation for plant-related differences (5.00%) (6.60%) (3.00%)
Federal tax credits (11.70%) (7.20%) (5.00%)
Non-controlling interest (0.70%) (0.60%) (0.50%)
AFUDC equity (0.40%) (0.40%) (0.60%)
Amortization of federal investment tax credits (0.60%) (0.50%) (0.50%)
Valuation allowance 0.70% 0.00% 0.00%
Stock compensation 0.00% (0.20%) (0.10%)
Officer compensation limitation 0.00% 0.10% 0.30%
Other (0.30%) (0.20%) (0.10%)
Effective Income Tax Rate Reconciliation, Percent, Total (1.60%) 2.80% 9.40%
Evergy Metro      
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current Federal Tax Expense (Benefit) $ 13.2 $ (21.9) $ 39.2
Current State and Local Tax Expense (Benefit) 3.7 4.1 3.2
Current Income Tax Expense (Benefit), Total 16.9 (17.8) 42.4
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Deferred Federal Income Tax Expense (Benefit) 33.6 69.9 6.5
Deferred State and Local Income Tax Expense (Benefit) (7.8) 0.6 4.8
Deferred Income Tax Expense (Benefit), Total 25.8 70.5 11.3
Investment Tax Credits      
Investment tax credit amortization (3.5) (2.4) (1.3)
Income Tax Expense (Benefit), Total $ 39.2 $ 50.3 $ 52.4
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Effect Of [Abstract]      
COLI policies (0.10%) (0.10%) (0.20%)
State income taxes (0.90%) 0.90% 1.70%
Flow through depreciation for plant-related differences (7.60%) (7.20%) (7.80%)
Federal tax credits (0.70%) (0.10%) (0.20%)
AFUDC equity (0.30%) (0.70%) (0.70%)
Amortization of federal investment tax credits (0.90%) (0.60%) (0.40%)
Stock compensation 0.10% (0.20%) 0.00%
Officer compensation limitation 0.50% 0.50% 0.90%
Other (0.50%) (1.10%) 0.10%
Effective Income Tax Rate Reconciliation, Percent, Total 10.60% 12.40% 14.40%