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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for uncollectible accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance At Beginning Of Period $ 31.4 $ 32.9 $ 19.3
Additions Charged To Costs And Expenses 15.4 16.1 28.0
Additions Charged To Other Accounts 10.7 11.2 12.0
Deductions 33.3 28.8 26.4
Balance At End Of Period 24.2 31.4 32.9
Allowance for uncollectible accounts | Evergy Kansas Central      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance At Beginning Of Period 16.9 13.0 7.5
Additions Charged To Costs And Expenses 7.7 13.1 12.0
Additions Charged To Other Accounts 4.7 4.5 4.5
Deductions 17.7 13.7 11.0
Balance At End Of Period 11.6 16.9 13.0
Allowance for uncollectible accounts | Evergy Metro      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance At Beginning Of Period 9.3 13.3 8.1
Additions Charged To Costs And Expenses 5.0 1.7 10.5
Additions Charged To Other Accounts 4.1 4.5 5.3
Deductions 10.5 10.2 10.6
Balance At End Of Period 7.9 9.3 13.3
Tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance At Beginning Of Period 12.8 12.8 14.4
Additions Charged To Costs And Expenses 3.5 0.1 0.0
Additions Charged To Other Accounts 0.0 0.0 0.0
Deductions 1.5 0.1 1.6
Balance At End Of Period 14.8 12.8 $ 12.8
Tax valuation allowance | Evergy Kansas Central      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance At Beginning Of Period 0.0    
Additions Charged To Costs And Expenses 2.7    
Additions Charged To Other Accounts 0.0    
Deductions 0.0    
Balance At End Of Period $ 2.7 $ 0.0