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PENSION PLANS AND POST-RETIREMENT BENEFITS - Expected Future Services (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | $ 187.6
2022 | 189.6
2023 | 192.6
2024 | 193.2
2025 | 195.5
2026-2030 | 957.0
Post-Retirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 16.7
2022 | 16.4
2023 | 16.1
2024 | 15.7
2025 | 15.3
2026-2030 | 73.1
Evergy Kansas Central | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 96.2
2022 | 95.5
2023 | 95.7
2024 | 95.2
2025 | 94.5
2026-2030 | 442.8
Evergy Kansas Central | Post-Retirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 9.5
2022 | 9.3
2023 | 9.1
2024 | 8.8
2025 | 8.6
2026-2030 | 39.8
Evergy Metro | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 90.2
2022 | 92.8
2023 | 95.6
2024 | 96.7
2025 | 99.4
2026-2030 | 506.5
Evergy Metro | Post-Retirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
2021 | 7.2
2022 | 7.1
2023 | 6.9
2024 | 6.9
2025 | 6.8
2026-2030 | $ 33.3

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