RECEIVABLES - Other Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables, contracts with customers	$ 110.9	$ 63.7
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables, contracts with customers	103.0	62.6
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables, contracts with customers	$ 6.8	$ 0.5