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PENSION PLANS AND POST-RETIREMENT BENEFITS - APBO (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
ABO for all defined benefit pension plans | $ 2,534.1 | $ 2,390.5
Pension plans with the PBO in excess of plan assets |  |
Projected benefit obligation | 2,901.1 | 2,718.2
Fair value of plan assets | 1,799.1 | 1,732.8
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 2,534.1 | 2,390.5
Fair value of plan assets | 1,799.1 | 1,732.8
Post-Retirement Benefits |  |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 280.4 | 264.3
Fair value of plan assets | 248.3 | 239.9
Evergy Metro | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
ABO for all defined benefit pension plans | 1,227.4 | 1,170.2
Pension plans with the PBO in excess of plan assets |  |
Projected benefit obligation | 1,446.5 | 1,371.4
Fair value of plan assets | 912.1 | 890.7
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 1,227.4 | 1,170.2
Fair value of plan assets | 912.1 | 890.7
Evergy Metro | Post-Retirement Benefits |  |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 133.6 | 125.6
Fair value of plan assets | 122.5 | 119.4
Evergy Kansas Central | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
ABO for all defined benefit pension plans | 1,281.6 | 1,196.8
Pension plans with the PBO in excess of plan assets |  |
Projected benefit obligation | 1,429.6 | 1,323.4
Fair value of plan assets | 887.0 | 842.1
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 1,281.6 | 1,196.8
Fair value of plan assets | 887.0 | 842.1
Evergy Kansas Central | Post-Retirement Benefits |  |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |
Accumulated benefit obligation | 146.8 | 138.7
Fair value of plan assets | $ 125.8 | $ 120.5

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