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PENSION PLANS AND POST-RETIREMENT BENEFITS - Employee Savings Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 17.4	$ 17.6	$ 16.3
Evergy Kansas Central
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	9.6	9.6	9.9
Evergy Metro
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 7.8	$ 8.0	$ 8.3

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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