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LONG-TERM DEBT - Scheduled Maturities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
2021 $ 432.0
2022 387.5
2023 439.5
2024 800.0
2025 636.0
Variable Interest Entities  
Debt Instrument [Line Items]  
2021 18.8
2022 0.0
2023 0.0
2024 0.0
2025 0.0
Evergy Kansas Central  
Debt Instrument [Line Items]  
2021 0.0
2022 0.0
2023 50.0
2024 0.0
2025 250.0
Evergy Metro  
Debt Instrument [Line Items]  
2021 0.0
2022 0.0
2023 379.5
2024 0.0
2025 $ 350.0