RECEIVABLES (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 197.3	$ 160.7
Allowance for credit losses	(24.7)	(32.9)
Total	383.7	221.6
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	210.5	178.5
Allowance for credit losses	(11.7)	(13.0)
Total	298.4	201.6
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	23.6	15.7
Allowance for credit losses	(8.6)	(13.3)
Total	79.0	31.0
Customer accounts receivable | Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	23.8	13.7
Customer accounts receivable | Billed | Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	11.5	9.7
Customer accounts receivable | Billed | Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	0.0	2.7
Customer accounts receivable | Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	187.3	80.1
Customer accounts receivable | Unbilled | Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	88.1	26.4
Customer accounts receivable | Unbilled | Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	$ 64.0	$ 25.9