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PENSION PLANS AND POST-RETIREMENT BENEFITS - APBO (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
ABO for all defined benefit pension plans | $ 1,539.7 | $ 1,687.3
Pension plans with the PBO in excess of plan assets |  |
Projected benefit obligation | 1,704.4 | 1,850.5
Fair value of plan assets | 1,250.7 | 1,409.2
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 1,539.7 | 1,687.3
Fair value of plan assets | 1,250.7 | 1,409.2
Post-Retirement Benefits |  |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 82.6 | 201.7
Fair value of plan assets | 66.9 | 192.9
Evergy Kansas Central | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
ABO for all defined benefit pension plans | 809.9 | 844.4
Pension plans with the PBO in excess of plan assets |  |
Projected benefit obligation | 876.2 | 911.7
Fair value of plan assets | 620.6 | 668.5
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 809.9 | 844.4
Fair value of plan assets | 620.6 | 668.5
Evergy Kansas Central | Post-Retirement Benefits |  |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 3.5 | 103.0
Fair value of plan assets | 0.0 | 96.2
Evergy Metro | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
ABO for all defined benefit pension plans | 711.3 | 824.6
Pension plans with the PBO in excess of plan assets |  |
Projected benefit obligation | 809.7 | 920.6
Fair value of plan assets | 630.1 | 740.7
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 711.3 | 824.6
Fair value of plan assets | 630.1 | 740.7
Evergy Metro | Post-Retirement Benefits |  |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 79.1 | 98.6
Fair value of plan assets | $ 66.9 | $ 96.7

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