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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%

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