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PENSION PLANS AND POST-RETIREMENT BENEFITS - Expected Future Services (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 135.6
2025 136.5
2026 138.9
2027 140.4
2028 141.1
2029-2033 707.7
Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 18.2
2025 17.6
2026 17.1
2027 15.2
2028 14.4
2029-2033 66.3
Evergy Kansas Central | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 74.4
2025 73.5
2026 72.9
2027 72.4
2028 71.5
2029-2033 344.0
Evergy Kansas Central | Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 10.3
2025 9.9
2026 9.4
2027 8.2
2028 7.8
2029-2033 35.0
Evergy Metro | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 59.6
2025 61.4
2026 64.4
2027 66.5
2028 68.1
2029-2033 356.5
Evergy Metro | Post-Retirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 7.8
2025 7.8
2026 7.7
2027 7.0
2028 6.6
2029-2033 $ 31.3