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RECEIVABLES - Allowance for Credit Loses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance January 1 $ 31.4 $ 32.9
Credit loss expense 15.4 16.1
Write-offs (33.3) (28.8)
Recoveries of prior write-offs 10.7 11.2
Ending balance December 31 24.2 31.4
Evergy Kansas Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance January 1 16.9 13.0
Credit loss expense 7.7 13.1
Write-offs (17.7) (13.7)
Recoveries of prior write-offs 4.7 4.5
Ending balance December 31 11.6 16.9
Evergy Metro    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance January 1 9.3 13.3
Credit loss expense 5.0 1.7
Write-offs (10.5) (10.2)
Recoveries of prior write-offs 4.1 4.5
Ending balance December 31 $ 7.9 $ 9.3