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PENSION PLANS AND POST-RETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	$ (21.1)	$ 52.8	$ 34.3
Non-qualified benefit obligations		37.8			$ 38.0
Funded by trusts containing assets		34.1			33.3
Contributions to plans remainder of year					45.2
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	0.0	6.7	0.0
Contributions to plans remainder of year					0.8
Pension and Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	(21.1)	59.5
Evergy Kansas Central | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	1.1	15.6	25.6
Non-qualified benefit obligations		19.6			19.5
Funded by trusts containing assets		24.9			24.5
Contributions to plans remainder of year					15.6
Evergy Kansas Central | Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	0.0	1.4	0.0
Contributions to plans remainder of year					0.4
Evergy Kansas Central | Pension and Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	1.1	17.0
Evergy Metro | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	(22.2)	37.2	13.7
Contributions to plans remainder of year					29.6
Evergy Metro | Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	0.0	5.3	$ 0.0
Contributions to plans remainder of year					$ 0.4
Evergy Metro | Pension and Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination (gain) loss	$ (22.2)	$ 42.5
Wolf Creek
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share	94.00%			94.00%
Wolf Creek | Evergy Kansas Central
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share	47.00%			47.00%
Wolf Creek | Evergy Kansas South Inc
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share	47.00%
Wolf Creek | Evergy Metro
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share	47.00%			47.00%

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-Topic 715
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The proportionate share of interest (percent) in a jointly owned utility plant.

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