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TAXES - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current income taxes      
Federal $ (26.8) $ (39.5) $ (67.4)
State 2.1 15.0 2.2
Total (24.7) (24.5) (65.2)
Deferred income taxes      
Federal 73.1 93.2 160.1
State 59.8 27.5 (32.3)
Total 132.9 120.7 127.8
Investment Tax Credits      
Amortization (6.0) (4.4) (3.6)
Deferral 0.0 5.2 0.0
Total (6.0) 0.8 (3.6)
Income tax expense $ 102.2 $ 97.0 $ 59.0
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
Effect of:      
COLI policies (1.60%) (1.80%) (1.90%)
State income taxes 4.30% 5.00% 4.90%
Flow through depreciation for plant-related differences (5.30%) (4.50%) 0.80%
Federal tax credits (4.60%) (4.90%) (6.40%)
Non-controlling interest (0.30%) (0.40%) (0.40%)
AFUDC equity (0.50%) (0.10%) (0.10%)
Amortization of federal investment tax credits (0.60%) (0.50%) (0.60%)
Changes In Uncertain Tax Positions, Net 0.00% (0.20%) 0.10%
Federal or state tax rate change 1.90% 0.00% (8.70%)
Valuation allowance (0.20%) (1.00%) 0.40%
Stock compensation (0.10%) 0.10% (0.40%)
Officer compensation limitation 0.20% 0.10% 1.20%
Other (0.20%) (0.40%) (0.20%)
Effective income tax rate 14.00% 12.40% 9.70%
Evergy Kansas Central      
Current income taxes      
Federal $ 14.5 $ 37.9 $ (0.3)
State (5.3) 2.6 (1.8)
Total 9.2 40.5 (2.1)
Deferred income taxes      
Federal (16.7) (8.9) 43.5
State 168.1 18.4 (42.9)
Total 151.4 9.5 0.6
Investment Tax Credits      
Amortization (4.8) (3.1) (2.8)
Deferral 0.0 5.2 0.0
Total (4.8) 2.1 (2.8)
Income tax expense $ 155.8 $ 52.1 $ (4.3)
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
Effect of:      
COLI policies (2.80%) (3.30%) (3.30%)
State income taxes 3.80% 5.30% 5.00%
Flow through depreciation for plant-related differences (0.10%) (0.10%) 1.60%
Federal tax credits (7.10%) (7.40%) (10.40%)
Non-controlling interest (0.60%) (0.80%) (0.60%)
AFUDC equity (0.50%) (0.10%) (0.20%)
Amortization of federal investment tax credits (0.70%) (0.70%) (0.80%)
Changes In Uncertain Tax Positions, Net 0.00% (0.40%) 0.10%
Federal or state tax rate change 27.80% 0.00% (15.30%)
Valuation allowance 0.00% (0.40%) 0.50%
Stock compensation (0.10%) (0.10%) (0.80%)
Officer compensation limitation 0.00% 0.00% 1.80%
Other (0.90%) (0.30%) 0.20%
Effective income tax rate 39.80% 12.70% (1.20%)
Evergy Metro      
Current income taxes      
Federal $ (0.2) $ 43.9 $ 29.8
State 10.8 22.4 8.9
Total 10.6 66.3 38.7
Deferred income taxes      
Federal 29.8 (24.5) (3.4)
State (32.2) (5.0) 53.0
Total (2.4) (29.5) 49.6
Investment Tax Credits      
Amortization (1.1) (1.1) (1.0)
Total (1.1) (1.1) (1.0)
Income tax expense $ 7.1 $ 35.7 $ 87.3
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
Effect of:      
COLI policies (0.30%) (0.20%) (0.20%)
State income taxes 4.90% 4.70% 5.50%
Flow through depreciation for plant-related differences (10.00%) (9.40%) (2.50%)
Federal tax credits (1.90%) (2.50%) (2.10%)
AFUDC equity (0.50%) (0.20%) (0.10%)
Amortization of federal investment tax credits (0.40%) (0.40%) (0.40%)
Federal or state tax rate change (10.50%) 0.00% 14.10%
Stock compensation (0.40%) 0.00% 0.00%
Officer compensation limitation 0.40% 0.30% 0.60%
Other 0.00% (1.00%) (1.00%)
Effective income tax rate 2.30% 12.30% 34.90%