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PENSION PLANS AND POST-RETIREMENT BENEFITS - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	$ (15.9)
Contributions by employer	16.4
Contributions to plans remainder of year	22.0
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0
Contributions by employer	0.2
Contributions to plans remainder of year	1.6
Evergy Kansas Central | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.4
Contributions by employer	11.8
Contributions to plans remainder of year	14.4
Evergy Kansas Central | Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0
Contributions by employer	0.1
Contributions to plans remainder of year	0.5
Evergy Metro | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	(16.3)
Contributions by employer	4.6
Contributions to plans remainder of year	7.6
Evergy Metro | Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0
Contributions by employer	0.1
Contributions to plans remainder of year	$ 1.1
Wolf Creek
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share	94.00%
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%

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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