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TAXES - Income Tax Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Current income taxes    
Federal $ 11.9 $ 0.2
State (0.6) 0.0
Total 11.3 0.2
Deferred income taxes    
Federal (7.3) 5.9
State 6.3 3.7
Total (1.0) 9.6
Investment tax credit amortization (1.0) (0.6)
Income tax expense $ 9.3 $ 9.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Effect of:    
COLI policies (1.80%) (3.10%)
State income taxes 4.60% 4.20%
Flow through depreciation for plant-related differences (4.40%) 0.90%
Federal tax credits (3.90%) (9.50%)
Non-controlling interest (0.30%) (0.50%)
AFUDC equity 0.00% (0.20%)
Amortization of federal investment tax credits (0.50%) (0.60%)
Valuation allowance (7.00%) 2.10%
Stock compensation 0.10% (1.10%)
Officer compensation limitation 0.20% 0.00%
Other 0.20% (0.50%)
Effective income tax rate 8.20% 12.70%
Westar Energy    
Current income taxes    
Federal $ 10.4 $ 0.2
State 0.4 0.0
Total 10.8 0.2
Deferred income taxes    
Federal (3.2) 5.9
State 3.6 3.7
Total 0.4 9.6
Investment tax credit amortization (0.7) (0.6)
Income tax expense $ 10.5 $ 9.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Effect of:    
COLI policies (3.20%) (3.10%)
State income taxes 5.00% 4.20%
Flow through depreciation for plant-related differences (0.10%) 0.90%
Federal tax credits (6.10%) (9.50%)
Non-controlling interest (0.60%) (0.50%)
AFUDC equity (0.10%) (0.20%)
Amortization of federal investment tax credits (0.70%) (0.60%)
Valuation allowance (2.10%) 2.10%
Stock compensation (0.10%) (1.10%)
Other 0.30% (0.50%)
Effective income tax rate 13.30% 12.70%
KCP&L    
Current income taxes    
Federal $ 7.9 $ (1.3)
State 0.8 (0.5)
Total 8.7 (1.8)
Deferred income taxes    
Federal (5.2) 3.6
State 0.4 2.0
Total (4.8) 5.6
Investment tax credit amortization (0.2) (0.3)
Income tax expense $ 3.7 $ 3.5
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Effect of:    
COLI policies (0.10%) (0.00%)
State income taxes 4.90% 5.10%
Flow through depreciation for plant-related differences (7.20%) (6.90%)
Federal tax credits (1.50%) (2.00%)
AFUDC equity 0.00% (0.30%)
Amortization of federal investment tax credits (0.30%) (0.40%)
Stock compensation 1.00% (0.20%)
Officer compensation limitation 0.30% 0.00%
Other 0.30% (1.40%)
Effective income tax rate 18.40% 14.90%