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PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2023
Retirement Benefits [Abstract] |
Schedule of Net Funded Status |
| Pension Benefits |  | Post-Retirement Benefits
| Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Change in projected benefit obligation (PBO) | (millions)
PBO as of January 1, 2023 | $ | 1,850.5 |  |  | $ | 911.7 |  |  | $ | 920.6 |  |  | $ | 201.7 |  |  | $ | 103.0 |  |  | $ | 98.6 |
Service cost | 44.9 |  |  | 18.6 |  |  | 26.3 |  |  | 1.8 |  |  | 0.9 |  |  | 0.9 |
Interest cost | 91.9 |  |  | 47.0 |  |  | 44.0 |  |  | 11.1 |  |  | 5.7 |  |  | 5.5 |
Contribution by participants | — |  |  | — |  |  | — |  |  | 6.2 |  |  | 1.0 |  |  | 5.2 |
Actuarial (gain) loss | 64.8 |  |  | 42.2 |  |  | 22.0 |  |  | (4.0) |  |  | (2.6) |  |  | (1.4) |
Benefits paid | (84.1) |  |  | (50.6) |  |  | (32.3) |  |  | (24.0) |  |  | (10.2) |  |  | (13.8) |
Settlements | (256.2) |  |  | (89.3) |  |  | (166.9) |  |  | — |  |  | — |  |  | — |
Other | (7.4) |  |  | (3.4) |  |  | (4.0) |  |  | — |  |  | — |  |  | — |
PBO as of December 31, 2023 | $ | 1,704.4 |  |  | $ | 876.2 |  |  | $ | 809.7 |  |  | $ | 192.8 |  |  | $ | 97.8 |  |  | $ | 95.0 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets as of January 1, 2023 | $ | 1,409.2 |  |  | $ | 668.5 |  |  | $ | 740.7 |  |  | $ | 192.9 |  |  | $ | 96.2 |  |  | $ | 96.7 |
Actual return on plan assets | 145.2 |  |  | 75.5 |  |  | 69.7 |  |  | 21.6 |  |  | 11.5 |  |  | 10.1 |
Contributions by employer and participants | 36.8 |  |  | 15.1 |  |  | 21.7 |  |  | 9.6 |  |  | 1.2 |  |  | 8.4 |
Benefits paid | (80.2) |  |  | (48.2) |  |  | (32.0) |  |  | (22.6) |  |  | (9.8) |  |  | (12.8) |
Settlements | (252.9) |  |  | (86.9) |  |  | (166.0) |  |  | — |  |  | — |  |  | — |
Other | (7.4) |  |  | (3.4) |  |  | (4.0) |  |  | — |  |  | — |  |  | — |
Fair value of plan assets as of December 31, 2023 | $ | 1,250.7 |  |  | $ | 620.6 |  |  | $ | 630.1 |  |  | $ | 201.5 |  |  | $ | 99.1 |  |  | $ | 102.4 |
Funded status as of December 31, 2023 | $ | (453.7) |  |  | $ | (255.6) |  |  | $ | (179.6) |  |  | $ | 8.7 |  |  | $ | 1.3 |  |  | $ | 7.4 |
|  | Pension Benefits |  | Post-Retirement Benefits
|  | Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Change in projected benefit obligation (PBO) |  | (millions)
PBO as of January 1, 2022 |  | $ | 2,561.7 |  |  | $ | 1,264.4 |  |  | $ | 1,273.5 |  |  | $ | 258.4 |  |  | $ | 133.9 |  |  | $ | 124.5 |
Service cost |  | 79.7 |  |  | 30.7 |  |  | 49.0 |  |  | 3.0 |  |  | 1.5 |  |  | 1.5 |
Interest cost |  | 79.3 |  |  | 38.8 |  |  | 39.8 |  |  | 7.9 |  |  | 4.1 |  |  | 3.8 |
Contribution by participants |  | — |  |  | — |  |  | — |  |  | 6.9 |  |  | 1.0 |  |  | 5.8 |
Plan amendments |  | 0.6 |  |  | 0.3 |  |  | 0.3 |  |  | — |  |  | — |  |  | — |
Actuarial gain |  | (717.9) |  |  | (334.3) |  |  | (378.6) |  |  | (58.1) |  |  | (28.7) |  |  | (29.4) |
Benefits paid |  | (189.4) |  |  | (100.1) |  |  | (88.0) |  |  | (23.1) |  |  | (10.2) |  |  | (12.9) |
Special termination benefits |  | 52.8 |  |  | 15.6 |  |  | 37.2 |  |  | 6.7 |  |  | 1.4 |  |  | 5.3 |
Other |  | (16.3) |  |  | (3.7) |  |  | (12.6) |  |  | — |  |  | — |  |  | — |
PBO as of December 31, 2022 |  | $ | 1,850.5 |  |  | $ | 911.7 |  |  | $ | 920.6 |  |  | $ | 201.7 |  |  | $ | 103.0 |  |  | $ | 98.6 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets as of January 1, 2022 |  | $ | 1,714.7 |  |  | $ | 835.7 |  |  | $ | 879.0 |  |  | $ | 242.3 |  |  | $ | 124.0 |  |  | $ | 118.3 |
Actual return on plan assets |  | (192.6) |  |  | (97.1) |  |  | (95.5) |  |  | (34.9) |  |  | (19.2) |  |  | (15.7) |
Contributions by employer and participants |  | 88.4 |  |  | 31.2 |  |  | 57.2 |  |  | 7.0 |  |  | 1.1 |  |  | 5.9 |
Benefits paid |  | (185.0) |  |  | (97.6) |  |  | (87.4) |  |  | (21.5) |  |  | (9.7) |  |  | (11.8) |
Other |  | (16.3) |  |  | (3.7) |  |  | (12.6) |  |  | — |  |  | — |  |  | — |
Fair value of plan assets as of December 31, 2022 |  | $ | 1,409.2 |  |  | $ | 668.5 |  |  | $ | 740.7 |  |  | $ | 192.9 |  |  | $ | 96.2 |  |  | $ | 96.7 |
Funded status as of December 31, 2022 |  | $ | (441.3) |  |  | $ | (243.2) |  |  | $ | (179.9) |  |  | $ | (8.8) |  |  | $ | (6.8) |  |  | $ | (1.9) |
Schedule of Amounts Recognized in Balance Sheet |
| Pension Benefits |  | Post-Retirement Benefits
| Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Amounts recognized in the consolidated balance sheets |  |  |  | (millions) |  |  |  |
Non-current asset | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 24.7 |  |  | $ | 5.0 |  |  | $ | 19.7 |
Current pension and other post-retirement liability | (4.5) |  |  | (2.5) |  |  | (0.5) |  |  | (1.1) |  |  | (0.5) |  |  | (0.6) |
Noncurrent pension liability and other post-retirement liability | (449.2) |  |  | (253.1) |  |  | (179.1) |  |  | (14.9) |  |  | (3.2) |  |  | (11.7) |
Net amount recognized before regulatory treatment | (453.7) |  |  | (255.6) |  |  | (179.6) |  |  | 8.7 |  |  | 1.3 |  |  | 7.4 |
Accumulated OCI or regulatory asset/liability | (92.4) |  |  | 60.7 |  |  | (144.1) |  |  | (34.0) |  |  | (18.6) |  |  | (21.7) |
Net amount recognized as of December 31, 2023 | $ | (546.1) |  |  | $ | (194.9) |  |  | $ | (323.7) |  |  | $ | (25.3) |  |  | $ | (17.3) |  |  | $ | (14.3) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |
Actuarial (gain) loss | $ | (104.1) |  |  | $ | 47.3 |  |  | $ | (142.8) |  |  | $ | (34.7) |  |  | $ | (19.0) |  |  | $ | (16.9) |
Prior service cost | 11.7 |  |  | 13.4 |  |  | (1.3) |  |  | 0.7 |  |  | 0.4 |  |  | (4.8) |
Net amount recognized as of December 31, 2023 | $ | (92.4) |  |  | $ | 60.7 |  |  | $ | (144.1) |  |  | $ | (34.0) |  |  | $ | (18.6) |  |  | $ | (21.7) |
|  | Pension Benefits |  | Post-Retirement Benefits
|  | Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Amounts recognized in the consolidated balance sheets |  |  |  | (millions) |  |  |  |
Non-current asset |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 16.8 |  |  | $ | — |  |  | $ | 16.8 |
Current pension and other post-retirement liability |  | (7.2) |  |  | (4.7) |  |  | (1.3) |  |  | (1.3) |  |  | (0.6) |  |  | (0.7) |
Noncurrent pension liability and other post- retirement liability |  | (434.1) |  |  | (238.5) |  |  | (178.6) |  |  | (24.3) |  |  | (6.2) |  |  | (18.0) |
Net amount recognized before regulatory treatment |  | (441.3) |  |  | (243.2) |  |  | (179.9) |  |  | (8.8) |  |  | (6.8) |  |  | (1.9) |
Accumulated OCI or regulatory asset/liability |  | (140.2) |  |  | 50.3 |  |  | (180.3) |  |  | (24.5) |  |  | (12.8) |  |  | (18.4) |
Net amount recognized as of December 31, 2022 |  | $ | (581.5) |  |  | $ | (192.9) |  |  | $ | (360.2) |  |  | $ | (33.3) |  |  | $ | (19.6) |  |  | $ | (20.3) |
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial (gain) loss |  | $ | (153.8) |  |  | $ | 35.0 |  |  | $ | (179.0) |  |  | $ | (25.3) |  |  | $ | (13.2) |  |  | $ | (13.1) |
Prior service cost |  | 13.6 |  |  | 15.3 |  |  | (1.3) |  |  | 0.8 |  |  | 0.4 |  |  | (5.3) |
Net amount recognized as of December 31, 2022 |  | $ | (140.2) |  |  | $ | 50.3 |  |  | $ | (180.3) |  |  | $ | (24.5) |  |  | $ | (12.8) |  |  | $ | (18.4) |
Actuarial losses for the Evergy Companies' pension benefit plans for 2023 were primarily driven by a decrease in the discount rate used to measure the benefit obligation as a result of lower market interest rates. Actuarial gains for the Evergy Companies' pension benefit plans for 2022 were primarily driven by an increase in the discount rate used to measure the benefit obligation as a result of higher market interest rates. See the weighted average assumptions used to determine the benefit obligations within this Note 9 for further information.
Schedule of Net Benefit Costs | The assets in the aforementioned trusts are not included in the table above. See Note 14 for more information on these amounts.
|  | Pension Benefits |  | Post-Retirement Benefits
Year Ended December 31, 2023 |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Components of net periodic benefit costs |  | (millions)
Service cost |  | $ | 44.9 |  |  | $ | 18.6 |  |  | $ | 26.3 |  |  | $ | 1.8 |  |  | $ | 0.9 |  |  | $ | 0.9 |
Interest cost |  | 91.9 |  |  | 47.0 |  |  | 44.0 |  |  | 11.1 |  |  | 5.7 |  |  | 5.5 |
Expected return on plan assets |  | (87.6) |  |  | (44.1) |  |  | (43.4) |  |  | (11.9) |  |  | (6.3) |  |  | (5.7) |
Prior service cost |  | 1.9 |  |  | 2.0 |  |  | — |  |  | 0.1 |  |  | — |  |  | (0.4) |
Recognized net actuarial (gain) loss |  | (21.5) |  |  | (2.5) |  |  | (18.2) |  |  | (4.2) |  |  | (2.0) |  |  | (2.1) |
Settlement and special termination (gain) loss |  | (21.1) |  |  | 1.1 |  |  | (22.2) |  |  | — |  |  | — |  |  | — |
Net periodic benefit costs before regulatory adjustment and intercompany allocations |  | 8.5 |  |  | 22.1 |  |  | (13.5) |  |  | (3.1) |  |  | (1.7) |  |  | (1.8) |
Regulatory adjustment |  | 94.0 |  |  | 30.4 |  |  | 63.0 |  |  | (0.1) |  |  | (1.7) |  |  | 2.1 |
Intercompany allocations |  | n/a |  | (2.3) |  |  | (1.1) |  |  | n/a |  | 0.3 |  |  | — |
Net periodic benefit costs (income) |  | 102.5 |  |  | 50.2 |  |  | 48.4 |  |  | (3.2) |  |  | (3.1) |  |  | 0.3 |
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities |  |
Current year net (gain) loss |  | 7.1 |  |  | 11.0 |  |  | (4.2) |  |  | (13.6) |  |  | (7.8) |  |  | (5.8) |
Amortization of gain |  | 21.5 |  |  | 2.5 |  |  | 18.2 |  |  | 4.2 |  |  | 2.0 |  |  | 2.1 |
Amortization of prior service cost |  | (1.9) |  |  | (2.0) |  |  | — |  |  | (0.1) |  |  | — |  |  | 0.4 |
Net gain (loss) due to settlement |  | 21.1 |  |  | (1.1) |  |  | 22.2 |  |  | — |  |  | — |  |  | — |
Total recognized in OCI or regulatory asset/liability |  | 47.8 |  |  | 10.4 |  |  | 36.2 |  |  | (9.5) |  |  | (5.8) |  |  | (3.3) |
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability |  | $ | 150.3 |  |  | $ | 60.6 |  |  | $ | 84.6 |  |  | $ | (12.7) |  |  | $ | (8.9) |  |  | $ | (3.0) |
|  | Pension Benefits |  | Post-Retirement Benefits
Year Ended December 31, 2022 |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Components of net periodic benefit costs |  | (millions)
Service cost |  | $ | 79.7 |  |  | $ | 30.7 |  |  | $ | 49.0 |  |  | $ | 3.0 |  |  | $ | 1.5 |  |  | $ | 1.5 |
Interest cost |  | 79.3 |  |  | 38.8 |  |  | 39.8 |  |  | 7.9 |  |  | 4.1 |  |  | 3.8 |
Expected return on plan assets |  | (104.0) |  |  | (51.2) |  |  | (56.4) |  |  | (10.2) |  |  | (6.5) |  |  | (3.7) |
Prior service cost |  | 1.9 |  |  | 2.0 |  |  | — |  |  | 0.5 |  |  | 0.4 |  |  | (1.4) |
Recognized net actuarial (gain) loss |  | 34.8 |  |  | 25.6 |  |  | 38.6 |  |  | (0.3) |  |  | (0.2) |  |  | (0.7) |
Settlement and special termination benefits |  | 52.8 |  |  | 15.6 |  |  | 37.2 |  |  | 6.7 |  |  | 1.4 |  |  | 5.3 |
Net periodic benefit costs before regulatory adjustment and intercompany allocations |  | 144.5 |  |  | 61.5 |  |  | 108.2 |  |  | 7.6 |  |  | 0.7 |  |  | 4.8 |
Regulatory adjustment |  | 14.7 |  |  | 0.7 |  |  | (12.1) |  |  | (7.1) |  |  | (3.6) |  |  | (1.3) |
Intercompany allocations |  | n/a |  | 2.9 |  |  | (18.4) |  |  | n/a |  | 0.3 |  |  | (0.6) |
Net periodic benefit costs (income) |  | 159.2 |  |  | 65.1 |  |  | 77.7 |  |  | 0.5 |  |  | (2.6) |  |  | 2.9 |
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities |  |  |  |  |  |  |  |  |  |  |  |
Current year net gain |  | (421.4) |  |  | (186.1) |  |  | (226.7) |  |  | (13.0) |  |  | (3.0) |  |  | (10.0) |
Amortization of gain (loss) |  | (34.7) |  |  | (25.6) |  |  | (38.6) |  |  | 0.4 |  |  | 0.2 |  |  | 0.7 |
Prior service cost |  | 0.6 |  |  | 0.4 |  |  | 0.4 |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost |  | (1.9) |  |  | (2.0) |  |  | — |  |  | (0.5) |  |  | (0.4) |  |  | 1.4 |
Total recognized in OCI or regulatory asset/liability |  | (457.4) |  |  | (213.3) |  |  | (264.9) |  |  | (13.1) |  |  | (3.2) |  |  | (7.9) |
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability |  | $ | (298.2) |  |  | $ | (148.2) |  |  | $ | (187.2) |  |  | $ | (12.6) |  |  | $ | (5.8) |  |  | $ | (5.0) |
|  | Pension Benefits |  | Post-Retirement Benefits
Year Ended December 31, 2021 |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Components of net periodic benefit costs |  | (millions)
Service cost |  | $ | 82.6 |  |  | $ | 29.1 |  |  | $ | 53.5 |  |  | $ | 3.3 |  |  | $ | 1.7 |  |  | $ | 1.6 |
Interest cost |  | 84.2 |  |  | 41.0 |  |  | 42.5 |  |  | 7.8 |  |  | 4.0 |  |  | 3.8 |
Expected return on plan assets |  | (103.5) |  |  | (52.8) |  |  | (55.7) |  |  | (8.9) |  |  | (6.3) |  |  | (2.6) |
Prior service cost |  | 2.0 |  |  | 2.1 |  |  | — |  |  | 0.5 |  |  | 0.5 |  |  | (1.0) |
Recognized net actuarial loss |  | 54.1 |  |  | 36.0 |  |  | 43.8 |  |  | 1.4 |  |  | 0.6 |  |  | (0.1) |
Settlement and special termination benefits |  | 34.3 |  |  | 25.6 |  |  | 13.7 |  |  | — |  |  | — |  |  | — |
Net periodic benefit costs before regulatory adjustment and intercompany allocations |  | 153.7 |  |  | 81.0 |  |  | 97.8 |  |  | 4.1 |  |  | 0.5 |  |  | 1.7 |
Regulatory adjustment |  | 17.3 |  |  | (13.1) |  |  | 4.2 |  |  | (4.8) |  |  | (3.3) |  |  | 0.4 |
Intercompany allocations |  | n/a |  | 3.2 |  |  | (25.9) |  |  | n/a |  | — |  |  | (0.4) |
Net periodic benefit costs (income) |  | 171.0 |  |  | 71.1 |  |  | 76.1 |  |  | (0.7) |  |  | (2.8) |  |  | 1.7 |
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities |  |  |  |  |  |  |  |  |  |  |  |
Current year net gain |  | (195.3) |  |  | (106.3) |  |  | (88.4) |  |  | (13.6) |  |  | (9.6) |  |  | (3.9) |
Amortization of gain (loss) |  | (52.4) |  |  | (36.0) |  |  | (43.9) |  |  | (1.3) |  |  | (0.5) |  |  | 0.1 |
Amortization of prior service cost |  | (2.0) |  |  | (2.1) |  |  | — |  |  | (0.5) |  |  | (0.5) |  |  | 1.0 |
Total recognized in OCI or regulatory asset/liability |  | (249.7) |  |  | (144.4) |  |  | (132.3) |  |  | (15.4) |  |  | (10.6) |  |  | (2.8) |
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability |  | $ | (78.7) |  |  | $ | (73.3) |  |  | $ | (56.2) |  |  | $ | (16.1) |  |  | $ | (13.4) |  |  | $ | (1.1) |
Schedule of Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets | Pension and other post-retirement benefit plans with the PBO, accumulated benefit obligation (ABO) or accumulated other post-retirement benefit obligation (APBO) in excess of the fair value of plan assets at year-end are detailed in the following tables.
December 31, 2023 |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
|  | (millions)
ABO for all defined benefit pension plans |  | $ | 1,539.7 |  |  | $ | 809.9 |  |  | $ | 711.3 |
Pension plans with the PBO in excess of plan assets |  |  |  |  |  |
Projected benefit obligation |  | $ | 1,704.4 |  |  | $ | 876.2 |  |  | $ | 809.7 |
Fair value of plan assets |  | 1,250.7 |  |  | 620.6 |  |  | 630.1 |
Pension plans with the ABO in excess of plan assets |  |  |  |  |  |
Accumulated benefit obligation |  | $ | 1,539.7 |  |  | $ | 809.9 |  |  | $ | 711.3 |
Fair value of plan assets |  | 1,250.7 |  |  | 620.6 |  |  | 630.1 |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |  |  |  |  |
Accumulated other post-retirement benefit obligation |  | $ | 82.6 |  |  | $ | 3.5 |  |  | $ | 79.1 |
Fair value of plan assets |  | 66.9 |  |  | — |  |  | 66.9 |
December 31, 2022 |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
|  | (millions)
ABO for all defined benefit pension plans |  | $ | 1,687.3 |  |  | $ | 844.4 |  |  | $ | 824.6 |
Pension plans with the PBO in excess of plan assets |  |  |  |  |  |
Projected benefit obligation |  | $ | 1,850.5 |  |  | $ | 911.7 |  |  | $ | 920.6 |
Fair value of plan assets |  | 1,409.2 |  |  | 668.5 |  |  | 740.7 |
Pension plans with the ABO in excess of plan assets |  |  |  |  |  |
Accumulated benefit obligation |  | $ | 1,687.3 |  |  | $ | 844.4 |  |  | $ | 824.6 |
Fair value of plan assets |  | 1,409.2 |  |  | 668.5 |  |  | 740.7 |
Other post-retirement benefit plans with the APBO in excess of plan assets |  |  |  |  |  |
Accumulated other post-retirement benefit obligation |  | $ | 201.7 |  |  | $ | 103.0 |  |  | $ | 98.6 |
Fair value of plan assets |  | 192.9 |  |  | 96.2 |  |  | 96.7 |
Schedule of Defined Benefit Plan, Assumptions | The following tables provide the weighted-average assumptions used to determine benefit obligations and net costs for the Evergy Companies' pension and post-retirement benefit plans.
Weighted-average assumptions used to determine the benefit obligation at December 31, 2023 |  | Pension Benefits |  | Post-Retirement Benefits
| Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Discount rate |  | 5.35 | % |  | 5.34 | % |  | 5.35 | % |  | 5.43 | % |  | 5.45 | % |  | 5.41 | %
Rate of compensation increase |  | 3.72 | % |  | 3.77 | % |  | 3.71 | % |  | 3.75 | % |  | n/a |  | 3.75 | %
Interest crediting rate for cash balance plans |  | 4.13 | % |  | 4.20 | % |  | 4.47 | % |  | n/a |  | n/a |  | n/a
Weighted-average assumptions used to determine the benefit obligation at December 31, 2022 |  | Pension Benefits |  | Post-Retirement Benefits
| Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Discount rate |  | 5.72 | % |  | 5.72 | % |  | 5.72 | % |  | 5.74 | % |  | 5.75 | % |  | 5.72 | %
Rate of compensation increase |  | 3.72 | % |  | 3.78 | % |  | 3.70 | % |  | 3.75 | % |  | n/a |  | 3.75 | %
Interest crediting rate for cash balance plans |  | 4.13 | % |  | 4.00 | % |  | 4.43 | % |  | n/a |  | n/a |  | n/a
Weighted-average assumptions used to determine net costs for the year ended December 31, 2023 |  | Pension Benefits |  | Post-Retirement Benefits
| Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Discount rate |  | 5.45 | % |  | 5.66 | % |  | 5.62 | % |  | 5.74 | % |  | 5.75 | % |  | 5.72 | %
Expected long-term return on plan assets |  | 6.71 | % |  | 6.80 | % |  | 6.62 | % |  | 5.48 | % |  | 5.75 | % |  | 5.22 | %
Rate of compensation increase |  | 3.72 | % |  | 3.78 | % |  | 3.70 | % |  | 3.75 | % |  | n/a |  | 3.75 | %
Interest crediting rate for cash balance plans |  | 4.13 | % |  | 4.00 | % |  | 4.43 | % |  | n/a |  | n/a |  | n/a
Weighted-average assumptions used to determine net costs for the year ended December 31, 2022 |  | Pension Benefits |  | Post-Retirement Benefits
| Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Discount rate |  | 3.10 | % |  | 3.10 | % |  | 3.11 | % |  | 3.12 | % |  | 3.11 | % |  | 3.13 | %
Expected long-term return on plan assets |  | 6.71 | % |  | 6.80 | % |  | 6.63 | % |  | 4.53 | % |  | 5.75 | % |  | 3.25 | %
Rate of compensation increase |  | 3.75 | % |  | 3.77 | % |  | 3.71 | % |  | 3.75 | % |  | n/a |  | 3.75 | %
Interest crediting rate for cash balance plans |  | 4.13 | % |  | 4.00 | % |  | 4.45 | % |  | n/a |  | n/a |  | n/a
Schedule of Expected Benefit Payments | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid through 2033.
| Pension Benefits |  | Post-Retirement Benefits
| Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
| (millions)
2024 | $ | 135.6 |  |  | $ | 74.4 |  |  | $ | 59.6 |  |  | $ | 18.2 |  |  | $ | 10.3 |  |  | $ | 7.8 |
2025 | 136.5 |  |  | 73.5 |  |  | 61.4 |  |  | 17.6 |  |  | 9.9 |  |  | 7.8 |
2026 | 138.9 |  |  | 72.9 |  |  | 64.4 |  |  | 17.1 |  |  | 9.4 |  |  | 7.7 |
2027 | 140.4 |  |  | 72.4 |  |  | 66.5 |  |  | 15.2 |  |  | 8.2 |  |  | 7.0 |
2028 | 141.1 |  |  | 71.5 |  |  | 68.1 |  |  | 14.4 |  |  | 7.8 |  |  | 6.6 |
2029-2033 | 707.7 |  |  | 344.0 |  |  | 356.5 |  |  | 66.3 |  |  | 35.0 |  |  | 31.3 |
Schedule of Allocation of Plan Assets | The following table provides the target asset allocations by asset class for the Evergy Kansas Central and Evergy Metro pension and other post-retirement plan assets.
| Pension Benefits |  | Post-Retirement Benefits
| Evergy Kansas Central |  | Evergy Metro |  | Evergy Kansas Central |  | Evergy Metro
Domestic equities | 26% |  | 26% |  | 26% |  | 18%
International equities | 20% |  | 19% |  | 18% |  | 10%
Bonds | 39% |  | 38% |  | 56% |  | 66%
Mortgage & asset backed securities | —% |  | —% |  | —% |  | 5%
Real estate investments | 4% |  | 6% |  | —% |  | —%
Other investments | 11% |  | 11% |  | —% |  | 1%
The fair values of the Evergy Companies' pension plan assets at December 31, 2023 and 2022, by asset category are in the following tables.
|  |  |  | Fair Value Measurements Using
Description | December 31 2023 | Level 1 |  | Level 2 |  | Level 3 |  | Assets measured at NAV
Evergy Kansas Central Pension Plans |  | (millions)
Domestic equities |  | $ | 145.9 |  |  |  | $ | 124.0 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 21.9 |
International equities |  | 118.2 |  |  |  | 118.2 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Bond funds |  | 224.2 |  |  |  | 224.2 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Real estate investments |  | 23.0 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 23.0 |
Combination debt/equity/other fund |  | 29.2 |  |  |  | 29.2 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Alternative investment funds |  | 74.6 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 74.6 |
Short-term investments |  | 5.5 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 5.5 |
Total |  | $ | 620.6 |  |  |  | $ | 495.6 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 125.0 |
Evergy Metro Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic equities |  | $ | 138.9 |  |  |  | $ | 122.9 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 16.0 |
International equities |  | 120.0 |  |  |  | 120.0 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Bond funds |  | 174.9 |  |  |  | 174.9 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Corporate bonds |  | 21.1 |  |  |  | — |  |  |  |  | 21.1 |  |  |  |  | — |  |  |  |  | — |
U.S. Treasury and agency bonds |  | 10.1 |  |  |  | 5.1 |  |  |  |  | 5.0 |  |  |  |  | — |  |  |  |  | — |
Mortgage and asset backed securities |  | 5.1 |  |  |  | — |  |  |  |  | 5.1 |  |  |  |  | — |  |  |  |  | — |
Real estate investments |  | 49.0 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 49.0 |
Combination debt/equity/other fund |  | 28.4 |  |  |  | 28.4 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Alternative investment funds |  | 70.8 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 70.8 |
Cash and cash equivalents |  | 5.9 |  |  |  | 5.9 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Short-term investments |  | 4.0 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 4.0 |
Other |  | 1.9 |  |  |  | — |  |  |  |  | 1.9 |  |  |  |  | — |  |  |  |  | — |
Total |  | $ | 630.1 |  |  |  | $ | 457.2 |  |  |  |  | $ | 33.1 |  |  |  |  | $ | — |  |  |  |  | $ | 139.8 |
|  |  |  | Fair Value Measurements Using
Description | December 31 2022 | Level 1 |  | Level 2 |  | Level 3 |  | Assets measured at NAV
Evergy Kansas Central Pension Plans |  | (millions) |
Domestic equities |  | $ | 156.8 |  |  |  | $ | 129.2 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 27.6 |  |
International equities |  | 129.1 |  |  |  | 129.1 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Bond funds |  | 241.7 |  |  |  | 241.7 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Real estate investments |  | 26.8 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 26.8 |  |
Combination debt/equity/other fund |  | 30.8 |  |  |  | 30.8 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Alternative investment funds |  | 63.9 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 63.9 |  |
Short-term investments |  | 19.4 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 19.4 |  |
Total |  | $ | 668.5 |  |  |  | $ | 530.8 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 137.7 |  |
Evergy Metro Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic equities |  | $ | 156.1 |  |  |  | $ | 135.5 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 20.6 |  |
International equities |  | 136.7 |  |  |  | 136.7 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Bond funds |  | 195.2 |  |  |  | 195.2 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Corporate bonds |  | 23.7 |  |  |  | — |  |  |  |  | 23.7 |  |  |  |  | — |  |  |  |  | — |  |
U.S. Treasury and agency bonds |  | 14.0 |  |  |  | 5.8 |  |  |  |  | 8.2 |  |  |  |  | — |  |  |  |  | — |  |
Mortgage and asset backed securities |  | 5.0 |  |  |  | — |  |  |  |  | 5.0 |  |  |  |  | — |  |  |  |  | — |  |
Real estate investments |  | 59.0 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 59.0 |  |
Combination debt/equity/other fund |  | 31.2 |  |  |  | 31.2 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Alternative investment funds |  | 63.1 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 63.1 |  |
Cash and cash equivalents |  | 44.6 |  |  |  | 44.6 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Short-term investments |  | 14.6 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 14.6 |  |
Other |  | (2.5) |  |  |  | — |  |  |  |  | (2.5) |  |  |  |  | — |  |  |  |  | — |  |
Total |  | $ | 740.7 |  |  |  | $ | 549.0 |  |  |  |  | $ | 34.4 |  |  |  |  | $ | — |  |  |  |  | $ | 157.3 |  |
The fair values of the Evergy Companies' post-retirement plan assets at December 31, 2023 and 2022, by asset category are in the following tables.
|  |  |  | Fair Value Measurements Using
Description | December 31 2023 | Level 1 |  | Level 2 |  | Level 3 |  | Assets measured at NAV
Evergy Kansas Central Post-Retirement Benefit Plans |  | (millions) |
Domestic equities |  | $ | 26.1 |  |  |  | $ | 26.1 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |
International equities |  | 17.9 |  |  |  | 17.9 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Bond funds |  | 49.6 |  |  |  | 49.6 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Combination debt/equity/other fund |  | 4.5 |  |  |  | 4.5 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Short-term investments |  | 1.0 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 1.0 |  |
Total |  | $ | 99.1 |  |  |  | $ | 98.1 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 1.0 |  |
Evergy Metro Post-Retirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic equities |  | $ | 21.8 |  |  |  | $ | 21.8 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |
International equities |  | 12.1 |  |  |  | 12.1 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Bond funds |  | 36.8 |  |  |  | 36.8 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Corporate bonds |  | 15.0 |  |  |  | — |  |  |  |  | 15.0 |  |  |  |  | — |  |  |  |  | — |  |
U.S. Treasury and agency bonds |  | 12.2 |  |  |  | 6.1 |  |  |  |  | 6.1 |  |  |  |  | — |  |  |  |  | — |  |
Mortgage and asset backed securities |  | 1.0 |  |  |  | — |  |  |  |  | 1.0 |  |  |  |  | — |  |  |  |  | — |  |
Combination debt/equity/other fund |  | 3.0 |  |  |  | 3.0 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Short-term investments |  | 0.2 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 0.2 |  |
Other |  | 0.3 |  |  |  | — |  |  |  |  | 0.3 |  |  |  |  | — |  |  |  |  | — |  |
Total |  | $ | 102.4 |  |  |  | $ | 79.8 |  |  |  |  | $ | 22.4 |  |  |  |  | $ | — |  |  |  |  | $ | 0.2 |  |
|  |  |  | Fair Value Measurements Using
Description | December 31 2022 | Level 1 |  | Level 2 |  | Level 3 |  | Assets measured at NAV
Evergy Kansas Central Post-Retirement Benefit Plans |  | (millions) |
Domestic equities |  | $ | 24.2 |  |  |  | $ | 24.2 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |
International equities |  | 17.5 |  |  |  | 17.5 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Bond funds |  | 48.7 |  |  |  | 48.7 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Combination debt/equity/other fund |  | 4.8 |  |  |  | 4.8 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Short-term investments |  | 1.0 |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 1.0 |  |
Total |  | $ | 96.2 |  |  |  | $ | 95.2 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 1.0 |  |
Evergy Metro Post-Retirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic equities |  | $ | 18.7 |  |  |  | $ | 18.7 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | — |  |
International equities |  | 11.6 |  |  |  | 11.6 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Bond funds |  | 34.9 |  |  |  | 34.9 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Corporate bonds |  | 14.6 |  |  |  | — |  |  |  |  | 14.6 |  |  |  |  | — |  |  |  |  | — |  |
U.S. Treasury and agency bonds |  | 12.3 |  |  |  | 6.0 |  |  |  |  | 6.3 |  |  |  |  | — |  |  |  |  | — |  |
Mortgage and asset backed securities |  | 1.3 |  |  |  | — |  |  |  |  | 1.3 |  |  |  |  | — |  |  |  |  | — |  |
Combination debt/equity/other fund |  | 2.9 |  |  |  | 2.9 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Cash and cash equivalents |  | 0.2 |  |  |  | 0.2 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |
Other |  | 0.2 |  |  |  | — |  |  |  |  | 0.2 |  |  |  |  | — |  |  |  |  | — |  |
Total |  | $ | 96.7 |  |  |  | $ | 74.3 |  |  |  |  | $ | 22.4 |  |  |  |  | $ | — |  |  |  |  | $ | — |  |
Schedule of Health Care Cost Trend Rates | The cost trend assumptions are detailed in the following tables.
Assumed annual health care cost growth rates as of December 31, 2023 |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Health care cost trend rate assumed for next year |  | 6.9 | % |  | 6.9 | % |  | 6.9 | %
Rate to which the cost trend is assumed to decline (the ultimate trend rate) |  | 4.5 | % |  | 4.5 | % |  | 4.5 | %
Year that rate reaches ultimate trend |  | 2030 |  | 2030 |  | 2030
Assumed annual health care cost growth rates as of December 31, 2022 |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Health care cost trend rate assumed for next year |  | 7.3 | % |  | 7.3 | % |  | 7.3 | %
Rate to which the cost trend is assumed to decline (the ultimate trend rate) |  | 4.5 | % |  | 4.5 | % |  | 4.5 | %
Year that rate reaches ultimate trend |  | 2030 |  | 2030 |  | 2030
Schedule of Costs of Retirement Plans | Evergy has defined contribution savings plans (401(k)) that cover substantially all employees. Evergy matches employee contributions, subject to limits. The annual costs of the plans are detailed in the following table.
|  | 2023 |  | 2022 |  | 2021
|  | (millions)
Evergy |  | $ | 24.1 |  |  | $ | 25.3 |  |  | $ | 25.6 |
Evergy Kansas Central |  | 11.3 |  |  | 12.0 |  |  | 11.7 |
Evergy Metro |  | 12.8 |  |  | 13.3 |  |  | 13.9 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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