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PENSION PLANS AND POST-RETIREMENT BENEFITS - Expected Future Services (Details)
$ in Millions
Dec. 31, 2020
USD ($)
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