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RECEIVABLES - Allowance for Credit Loses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance January 1 $ 31.4 $ 32.9
Credit loss expense (income) (3.3) (4.1)
Write-offs (8.3) (7.9)
Recoveries of prior write-offs 3.1 3.5
Ending balance March 31 22.9 24.4
Evergy Kansas Central    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance January 1 16.9 13.0
Credit loss expense (income) (1.8) (0.6)
Write-offs (4.3) (3.6)
Recoveries of prior write-offs 1.3 1.3
Ending balance March 31 12.1 10.1
Evergy Metro    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance January 1 9.3 13.3
Credit loss expense (income) (0.8) (2.4)
Write-offs (2.7) (2.9)
Recoveries of prior write-offs 1.2 1.5
Ending balance March 31 $ 7.0 $ 9.5