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PENSION PLANS AND POST-RETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2023
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | $ (21.1) | $ 52.8 | $ 34.3 |  |
Non-qualified benefit obligations |  | 37.8 |  |  | $ 38.0
Funded by trusts containing assets |  | 34.1 |  |  | 33.3
Contributions to plans remainder of year |  |  |  |  | 45.2
Post-Retirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | 0.0 | 6.7 | 0.0 |  |
Contributions to plans remainder of year |  |  |  |  | 0.8
Pension and Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | (21.1) | 59.5 |  |  |
Evergy Kansas Central | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | 1.1 | 15.6 | 25.6 |  |
Non-qualified benefit obligations |  | 19.6 |  |  | 19.5
Funded by trusts containing assets |  | 24.9 |  |  | 24.5
Contributions to plans remainder of year |  |  |  |  | 15.6
Evergy Kansas Central | Post-Retirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | 0.0 | 1.4 | 0.0 |  |
Contributions to plans remainder of year |  |  |  |  | 0.4
Evergy Kansas Central | Pension and Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | 1.1 | 17.0 |  |  |
Evergy Metro | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | (22.2) | 37.2 | 13.7 |  |
Contributions to plans remainder of year |  |  |  |  | 29.6
Evergy Metro | Post-Retirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | 0.0 | 5.3 | $ 0.0 |  |
Contributions to plans remainder of year |  |  |  |  | $ 0.4
Evergy Metro | Pension and Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement and special termination (gain) loss | $ (22.2) | $ 42.5 |  |  |
Wolf Creek |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | 94.00% |  |  | 94.00% |
Wolf Creek | Evergy Kansas Central |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | 47.00% |  |  | 47.00% |
Wolf Creek | Evergy Kansas South Inc |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | 47.00% |  |  |  |
Wolf Creek | Evergy Metro |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | 47.00% |  |  | 47.00% |

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