PENSION PLANS AND POST-RETIREMENT BENEFITS - APBO (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	$ 1,539.7	$ 1,687.3
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	1,704.4	1,850.5
Fair value of plan assets	1,250.7	1,409.2
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	1,539.7	1,687.3
Fair value of plan assets	1,250.7	1,409.2
Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	82.6	201.7
Fair value of plan assets	66.9	192.9
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	809.9	844.4
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	876.2	911.7
Fair value of plan assets	620.6	668.5
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	809.9	844.4
Fair value of plan assets	620.6	668.5
Evergy Kansas Central \| Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	3.5	103.0
Fair value of plan assets	0.0	96.2
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	711.3	824.6
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	809.7	920.6
Fair value of plan assets	630.1	740.7
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	711.3	824.6
Fair value of plan assets	630.1	740.7
Evergy Metro \| Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	79.1	98.6
Fair value of plan assets	$ 66.9	$ 96.7

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

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