RECEIVABLES (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 136.0	$ 160.7
Allowance for credit losses	(24.4)	(32.9)
Total	185.2	221.6
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	159.0	178.5
Allowance for credit losses	(10.1)	(13.0)
Total	178.9	201.6
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	16.1	15.7
Allowance for credit losses	(9.5)	(13.3)
Total	19.2	31.0
Customer accounts receivable | Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	14.5	13.7
Customer accounts receivable | Billed | Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	8.6	9.7
Customer accounts receivable | Billed | Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	3.4	2.7
Customer accounts receivable | Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	59.1	80.1
Customer accounts receivable | Unbilled | Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	21.4	26.4
Customer accounts receivable | Unbilled | Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	$ 9.2	$ 25.9