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PENSION PLANS AND POST-RETIREMENT BENEFITS - Expected Future Services (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 180.6
2021 182.4
2022 181.1
2023 181.8
2024 185.0
2025-2029 918.2
Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 16.7
2021 16.7
2022 16.4
2023 16.3
2024 15.9
2025-2029 75.2
Evergy Kansas Central | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 95.1
2021 95.6
2022 93.3
2023 91.5
2024 91.9
2025-2029 428.3
Evergy Kansas Central | Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 9.6
2021 9.5
2022 9.3
2023 9.2
2024 8.8
2025-2029 40.3
Evergy Metro | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 84.3
2021 85.5
2022 86.5
2023 89.0
2024 91.7
2025-2029 482.3
Evergy Metro | Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 7.1
2021 7.2
2022 7.1
2023 7.1
2024 7.1
2025-2029 $ 34.9