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PENSION PLANS AND POST-RETIREMENT BENEFITS - Expected Future Services (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 159.5
2023 160.4
2024 163.8
2025 168.1
2026 173.5
2027-2031 862.9
Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 16.1
2023 15.6
2024 15.1
2025 14.7
2026 14.3
2027-2031 68.5
Evergy Kansas Central | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 80.8
2023 79.6
2024 80.6
2025 81.3
2026 83.2
2027-2031 399.5
Evergy Kansas Central | Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 9.2
2023 9.0
2024 8.5
2025 8.2
2026 8.0
2027-2031 37.2
Evergy Metro | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 77.5
2023 79.5
2024 81.7
2025 85.3
2026 88.8
2027-2031 455.7
Evergy Metro | Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 6.9
2023 6.7
2024 6.6
2025 6.5
2026 6.4
2027-2031 $ 31.2