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TAXES - State Tax Reform (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
May 01, 2020 | Jun. 01, 2018 | Dec. 31, 2020
State Tax Reform [Line Items] |  |  |
Decrease in net deferred income tax liabilities due to tax reform | $ 233.8 |  |
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base | 400.4 |  |
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform | 31.7 |  |
Decrease in unamortized investment tax credits | 183.6 |  |
Decrease in unamortized investment tax credits for tax gross up adjustment for ratemaking purposes | 16.9 |  |
Income tax expense from tax reform | 13.8 |  |
Kansas state statutory income tax rate thru 2020 |  |  | 7.00%
Evergy Kansas Central |  |  |
State Tax Reform [Line Items] |  |  |
Decrease in net deferred income tax liabilities due to tax reform | 17.6 |  |
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base | 293.7 |  |
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform | 17.3 |  |
Decrease in unamortized investment tax credits | 183.6 |  |
Decrease in unamortized investment tax credits for tax gross up adjustment for ratemaking purposes | 16.9 |  |
Income tax expense from tax reform | 109.0 |  |
Evergy Metro |  |  |
State Tax Reform [Line Items] |  |  |
Decrease in net deferred income tax liabilities due to tax reform | 152.9 | $ 46.6 |
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base | 106.7 | 28.8 |
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform | 14.4 | 9.9 |
Income tax expense from tax reform | $ 32.2 | $ 15.5 |

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