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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Payment for settlement of interest rate swap accounted for as a cash flow hedge | $ 69.8 |  | $ 0.0 | $ 69.8 | $ 0.0
Notional amount | 500.0 | $ 500.0 |  |  |
Other comprehensive loss |  | 69.8 | 0.0 | 64.4 | 5.4
Interest expense |  |  | (383.9) | (374.0) | (279.6)
Income tax benefit |  |  | (102.2) | (97.0) | $ (59.0)
Accumulated other comprehensive loss over the next twelve months |  |  | 5.4 |  |
Senior Notes Due 2029 Evergy | Senior Notes |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Debt issued | $ 800.0 | $ 800.0 |  |  |
Interest rate | 2.90% | 2.90% |  |  |
Debt instrument, term |  | 10 years |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Interest expense |  |  | 7.0 | 2.0 |
Income tax benefit |  |  | $ (4.0) | $ (0.5) |

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