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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	$ (51.2)	$ (62.9)	$ (55.6)
Other	(23.9)	(34.4)	(31.8)
Other expense	(75.1)	(97.3)	(87.4)
Evergy Kansas Central
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	(17.6)	(17.1)	(15.6)
Other	(21.1)	(22.5)	(20.3)
Other expense	(38.7)	(39.6)	(35.9)
Evergy Metro
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	(24.8)	(31.0)	(26.7)
Other	(2.2)	(2.9)	(2.7)
Other expense	$ (27.0)	$ (33.9)	$ (29.4)