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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%

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