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ORGANIZATION AND BASIS OF PRESENTATION - Other Income And Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Entity Information [Line Items]
Non-service cost component of net benefit cost	$ (14.8)	$ (18.4)
Other	(6.5)	(6.5)
Other expense	(21.3)	(24.9)
Evergy Kansas Central
Entity Information [Line Items]
Non-service cost component of net benefit cost	(4.0)	(4.6)
Other	(5.9)	(5.6)
Other expense	(9.9)	(10.2)
Evergy Metro
Entity Information [Line Items]
Non-service cost component of net benefit cost	(8.7)	(10.0)
Other	(0.3)	(0.5)
Other expense	$ (9.0)	$ (10.5)