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EQUITY COMPENSATION - Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	$ 17.7	$ 18.8	$ 15.6
Income tax (expense) benefit	1.6	2.6	(0.1)
Evergy Kansas Central
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	6.5	8.4	6.9
Income tax (expense) benefit	1.4	1.7	(0.2)
Evergy Metro
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	5.7	6.0	5.1
Income tax (expense) benefit	$ (0.6)	$ 0.2	$ (0.6)

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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