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FAIR VALUE MEASUREMENTS - NAV (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
fund
extension
Dec. 31, 2022
USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 1.4 $ 1.5
Evergy Kansas Central | Alternative investments fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments 0.0 0.0
Evergy Kansas Central | Real estate securities fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments 0.0 0.0
Domestic | Evergy Kansas Central | Equity securities    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 1.4 1.5
NAV, number of funds | fund 5  
NAV, number of funds making distributions | fund 3  
Domestic | Evergy Kansas Central | Equity Securities - Fourth Fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Length of settlement 15 years  
NAV, number of extensions | extension 3  
NAV, extension term 1 year  
Domestic | Evergy Kansas Central | Equity Securities - Fifth Fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Length of settlement 15 years  
Fair Value, Measurements, Recurring    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust $ 766.4 653.3
Total rabbi trust 33.3 34.1
Total Assets 858.1 748.9
Fair Value, Measurements, Recurring | Evergy Kansas Central    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust 365.1 318.8
Total rabbi trust 24.5 24.9
Total Assets 430.5 393.6
Fair Value, Measurements, Recurring | Evergy Kansas Central | Alternative investments fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust 37.9 31.8
Fair Value, Measurements, Recurring | Evergy Kansas Central | Real estate securities fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust 17.2 18.9
Fair Value, Measurements, Recurring | Evergy Kansas Central | Core bond fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust 56.2 51.0
Fair Value, Measurements, Recurring | Evergy Kansas Central | Combination debt/equity/other fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total rabbi trust 1.7 1.9
Fair Value, Measurements, Recurring | Other Evergy    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total rabbi trust 8.8 9.2
Total Assets 10.6 9.6
Fair Value, Measurements, Recurring | Other Evergy | Core bond fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total rabbi trust 8.8 9.2
Fair Value, Measurements, Recurring | Domestic | Evergy Kansas Central | Equity securities    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust 133.1 112.5
NAV | Fair Value, Measurements, Recurring    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust 64.9 62.8
Total rabbi trust 0.0 0.0
Total Assets 64.9 62.8
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust 64.9 62.8
Total rabbi trust 0.0 0.0
Total Assets 64.9 62.8
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Alternative investments fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust $ 37.9 31.8
Length of Settlement 65 days  
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Real estate securities fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust $ 17.2 18.9
Length of Settlement 65 days  
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Core bond fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust $ 0.0 0.0
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Combination debt/equity/other fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total rabbi trust 0.0 0.0
NAV | Fair Value, Measurements, Recurring | Other Evergy    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total rabbi trust 0.0 0.0
Total Assets 0.0 0.0
NAV | Fair Value, Measurements, Recurring | Other Evergy | Core bond fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total rabbi trust 0.0 0.0
NAV | Fair Value, Measurements, Recurring | Domestic | Evergy Kansas Central | Equity securities    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total nuclear decommissioning trust $ 9.8 $ 12.1