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PENSION PLANS AND POST-RETIREMENT BENEFITS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits |  |  |
Components of net periodic benefit costs |  |  |
Defined benefit plan, benefit obligation, beginning of the year | $ 1,850.5 | $ 2,561.7 |
Service cost | 44.9 | 79.7 | $ 82.6
Interest cost | 91.9 | 79.3 | 84.2
Contribution by participants | 0.0 | 0.0 |
Plan amendments |  | 0.6 |
Actuarial gain (loss) | 64.8 | (717.9) |
Benefits paid | (84.1) | (189.4) |
Special termination benefits |  | 52.8 |
Settlements | (256.2) |  |
Other | (7.4) | (16.3) |
Defined benefit plan, benefit obligation, end of the year | 1,704.4 | 1,850.5 | 2,561.7
Change in plan assets |  |  |
Fair value of plan assets, beginning of the year | 1,409.2 | 1,714.7 |
Actual return on plan assets | 145.2 | (192.6) |
Contributions by employer and participants | 36.8 | 88.4 |
Benefits paid | (80.2) | (185.0) |
Settlements | (252.9) |  |
Other | (7.4) | (16.3) |
Fair value of plan assets, end of the year | 1,250.7 | 1,409.2 | 1,714.7
Funded status at end of year | (453.7) | (441.3) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current asset | 0.0 | 0.0 |
Current pension and other post-retirement liability | (4.5) | (7.2) |
Noncurrent pension liability and other post-retirement liability | (449.2) | (434.1) |
Net amount recognized before regulatory treatment | (453.7) | (441.3) |
Accumulated OCI or regulatory asset/liability | (92.4) | (140.2) |
Net amount recognized as of December 31, 2023 | (546.1) | (581.5) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Accumulated OCI or regulatory asset/liability | (92.4) | (140.2) |
Pension Benefits | Evergy Kansas Central |  |  |
Components of net periodic benefit costs |  |  |
Defined benefit plan, benefit obligation, beginning of the year | 911.7 | 1,264.4 |
Service cost | 18.6 | 30.7 | 29.1
Interest cost | 47.0 | 38.8 | 41.0
Contribution by participants | 0.0 | 0.0 |
Plan amendments |  | 0.3 |
Actuarial gain (loss) | 42.2 | (334.3) |
Benefits paid | (50.6) | (100.1) |
Special termination benefits |  | 15.6 |
Settlements | (89.3) |  |
Other | (3.4) | (3.7) |
Defined benefit plan, benefit obligation, end of the year | 876.2 | 911.7 | 1,264.4
Change in plan assets |  |  |
Fair value of plan assets, beginning of the year | 668.5 | 835.7 |
Actual return on plan assets | 75.5 | (97.1) |
Contributions by employer and participants | 15.1 | 31.2 |
Benefits paid | (48.2) | (97.6) |
Settlements | (86.9) |  |
Other | (3.4) | (3.7) |
Fair value of plan assets, end of the year | 620.6 | 668.5 | 835.7
Funded status at end of year | (255.6) | (243.2) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current asset | 0.0 | 0.0 |
Current pension and other post-retirement liability | (2.5) | (4.7) |
Noncurrent pension liability and other post-retirement liability | (253.1) | (238.5) |
Net amount recognized before regulatory treatment | (255.6) | (243.2) |
Accumulated OCI or regulatory asset/liability | 60.7 | 50.3 |
Net amount recognized as of December 31, 2023 | (194.9) | (192.9) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Accumulated OCI or regulatory asset/liability | 60.7 | 50.3 |
Pension Benefits | Evergy Metro |  |  |
Components of net periodic benefit costs |  |  |
Defined benefit plan, benefit obligation, beginning of the year | 920.6 | 1,273.5 |
Service cost | 26.3 | 49.0 | 53.5
Interest cost | 44.0 | 39.8 | 42.5
Contribution by participants | 0.0 | 0.0 |
Plan amendments |  | 0.3 |
Actuarial gain (loss) | 22.0 | (378.6) |
Benefits paid | (32.3) | (88.0) |
Special termination benefits |  | 37.2 |
Settlements | (166.9) |  |
Other | (4.0) | (12.6) |
Defined benefit plan, benefit obligation, end of the year | 809.7 | 920.6 | 1,273.5
Change in plan assets |  |  |
Fair value of plan assets, beginning of the year | 740.7 | 879.0 |
Actual return on plan assets | 69.7 | (95.5) |
Contributions by employer and participants | 21.7 | 57.2 |
Benefits paid | (32.0) | (87.4) |
Settlements | (166.0) |  |
Other | (4.0) | (12.6) |
Fair value of plan assets, end of the year | 630.1 | 740.7 | 879.0
Funded status at end of year | (179.6) | (179.9) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current asset | 0.0 | 0.0 |
Current pension and other post-retirement liability | (0.5) | (1.3) |
Noncurrent pension liability and other post-retirement liability | (179.1) | (178.6) |
Net amount recognized before regulatory treatment | (179.6) | (179.9) |
Accumulated OCI or regulatory asset/liability | (144.1) | (180.3) |
Net amount recognized as of December 31, 2023 | (323.7) | (360.2) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Accumulated OCI or regulatory asset/liability | (144.1) | (180.3) |
Post-Retirement Benefits |  |  |
Components of net periodic benefit costs |  |  |
Defined benefit plan, benefit obligation, beginning of the year | 201.7 | 258.4 |
Service cost | 1.8 | 3.0 | 3.3
Interest cost | 11.1 | 7.9 | 7.8
Contribution by participants | 6.2 | 6.9 |
Plan amendments |  | 0.0 |
Actuarial gain (loss) | (4.0) | (58.1) |
Benefits paid | (24.0) | (23.1) |
Special termination benefits |  | 6.7 |
Settlements | 0.0 |  |
Other | 0.0 | 0.0 |
Defined benefit plan, benefit obligation, end of the year | 192.8 | 201.7 | 258.4
Change in plan assets |  |  |
Fair value of plan assets, beginning of the year | 192.9 | 242.3 |
Actual return on plan assets | 21.6 | (34.9) |
Contributions by employer and participants | 9.6 | 7.0 |
Benefits paid | (22.6) | (21.5) |
Settlements | 0.0 |  |
Other | 0.0 | 0.0 |
Fair value of plan assets, end of the year | 201.5 | 192.9 | 242.3
Funded status at end of year | 8.7 | (8.8) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current asset | 24.7 | 16.8 |
Current pension and other post-retirement liability | (1.1) | (1.3) |
Noncurrent pension liability and other post-retirement liability | (14.9) | (24.3) |
Net amount recognized before regulatory treatment | 8.7 | (8.8) |
Accumulated OCI or regulatory asset/liability | (34.0) | (24.5) |
Net amount recognized as of December 31, 2023 | (25.3) | (33.3) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Accumulated OCI or regulatory asset/liability | (34.0) | (24.5) |
Post-Retirement Benefits | Evergy Kansas Central |  |  |
Components of net periodic benefit costs |  |  |
Defined benefit plan, benefit obligation, beginning of the year | 103.0 | 133.9 |
Service cost | 0.9 | 1.5 | 1.7
Interest cost | 5.7 | 4.1 | 4.0
Contribution by participants | 1.0 | 1.0 |
Plan amendments |  | 0.0 |
Actuarial gain (loss) | (2.6) | (28.7) |
Benefits paid | (10.2) | (10.2) |
Special termination benefits |  | 1.4 |
Settlements | 0.0 |  |
Other | 0.0 | 0.0 |
Defined benefit plan, benefit obligation, end of the year | 97.8 | 103.0 | 133.9
Change in plan assets |  |  |
Fair value of plan assets, beginning of the year | 96.2 | 124.0 |
Actual return on plan assets | 11.5 | (19.2) |
Contributions by employer and participants | 1.2 | 1.1 |
Benefits paid | (9.8) | (9.7) |
Settlements | 0.0 |  |
Other | 0.0 | 0.0 |
Fair value of plan assets, end of the year | 99.1 | 96.2 | 124.0
Funded status at end of year | 1.3 | (6.8) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current asset | 5.0 | 0.0 |
Current pension and other post-retirement liability | (0.5) | (0.6) |
Noncurrent pension liability and other post-retirement liability | (3.2) | (6.2) |
Net amount recognized before regulatory treatment | 1.3 | (6.8) |
Accumulated OCI or regulatory asset/liability | (18.6) | (12.8) |
Net amount recognized as of December 31, 2023 | (17.3) | (19.6) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Accumulated OCI or regulatory asset/liability | (18.6) | (12.8) |
Post-Retirement Benefits | Evergy Metro |  |  |
Components of net periodic benefit costs |  |  |
Defined benefit plan, benefit obligation, beginning of the year | 98.6 | 124.5 |
Service cost | 0.9 | 1.5 | 1.6
Interest cost | 5.5 | 3.8 | 3.8
Contribution by participants | 5.2 | 5.8 |
Plan amendments |  | 0.0 |
Actuarial gain (loss) | (1.4) | (29.4) |
Benefits paid | (13.8) | (12.9) |
Special termination benefits |  | 5.3 |
Settlements | 0.0 |  |
Other | 0.0 | 0.0 |
Defined benefit plan, benefit obligation, end of the year | 95.0 | 98.6 | 124.5
Change in plan assets |  |  |
Fair value of plan assets, beginning of the year | 96.7 | 118.3 |
Actual return on plan assets | 10.1 | (15.7) |
Contributions by employer and participants | 8.4 | 5.9 |
Benefits paid | (12.8) | (11.8) |
Settlements | 0.0 |  |
Other | 0.0 | 0.0 |
Fair value of plan assets, end of the year | 102.4 | 96.7 | $ 118.3
Funded status at end of year | 7.4 | (1.9) |
Amounts recognized in the consolidated balance sheets |  |  |
Non-current asset | 19.7 | 16.8 |
Current pension and other post-retirement liability | (0.6) | (0.7) |
Noncurrent pension liability and other post-retirement liability | (11.7) | (18.0) |
Net amount recognized before regulatory treatment | 7.4 | (1.9) |
Accumulated OCI or regulatory asset/liability | (21.7) | (18.4) |
Net amount recognized as of December 31, 2023 | (14.3) | (20.3) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Accumulated OCI or regulatory asset/liability | (21.7) | (18.4) |
Actuarial (gain) loss | Pension Benefits |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Actuarial (gain) loss | (104.1) | (153.8) |
Actuarial (gain) loss | Pension Benefits | Evergy Kansas Central |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Actuarial (gain) loss | 47.3 | 35.0 |
Actuarial (gain) loss | Pension Benefits | Evergy Metro |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Actuarial (gain) loss | (142.8) | (179.0) |
Actuarial (gain) loss | Post-Retirement Benefits |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Actuarial (gain) loss | (34.7) | (25.3) |
Actuarial (gain) loss | Post-Retirement Benefits | Evergy Kansas Central |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Actuarial (gain) loss | (19.0) | (13.2) |
Actuarial (gain) loss | Post-Retirement Benefits | Evergy Metro |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Actuarial (gain) loss | (16.9) | (13.1) |
Prior service cost | Pension Benefits |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Prior service cost | 11.7 | 13.6 |
Prior service cost | Pension Benefits | Evergy Kansas Central |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Prior service cost | 13.4 | 15.3 |
Prior service cost | Pension Benefits | Evergy Metro |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Prior service cost | (1.3) | (1.3) |
Prior service cost | Post-Retirement Benefits |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Prior service cost | 0.7 | 0.8 |
Prior service cost | Post-Retirement Benefits | Evergy Kansas Central |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Prior service cost | 0.4 | 0.4 |
Prior service cost | Post-Retirement Benefits | Evergy Metro |  |  |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |
Prior service cost | $ (4.8) | $ (5.3) |

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- Definition The pretax net amounts of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income or regulatory (assets) liabilities as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets. + References No definition available. + Details
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