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RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	$ 93.2
Evergy Metro
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	71.3
Evergy Metro | Evergy Inc Money Pool
Related Party Transaction [Line Items]
Due from Related Parties, Current	100.0
Due to Related Parties, Current	0.0
Due from (to) related parties		$ 0.0
Evergy Metro | Evergy Missouri West
Related Party Transaction [Line Items]
Due from (to) related parties	188.1	78.7
Evergy Metro | Evergy Missouri West | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	168.7	172.8	$ 183.2
Evergy Metro | Evergy Kansas Central
Related Party Transaction [Line Items]
Due from (to) related parties	21.7	14.9
Evergy Metro | Evergy Kansas Central | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	130.8	154.9	82.9
Evergy Metro | Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	15.7	(4.3)
Evergy Metro | Evergy | Income Tax Receivable
Related Party Transaction [Line Items]
Due from (to) related parties	3.2
Evergy Metro | Evergy | Income Taxes Payable
Related Party Transaction [Line Items]
Due from (to) related parties		14.1
Evergy Kansas Central
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	34.4
Evergy Kansas Central | Evergy Missouri West
Related Party Transaction [Line Items]
Due from (to) related parties	6.6	3.1
Evergy Kansas Central | Evergy Missouri West | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	37.6	24.9	12.3
Evergy Kansas Central | Evergy Metro
Related Party Transaction [Line Items]
Due from (to) related parties	(21.7)	(14.9)
Evergy Kansas Central | Evergy Metro | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	34.7	40.6	$ 17.5
Evergy Kansas Central | Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	0.1	6.9
Evergy Kansas Central | Evergy | Income Tax Receivable
Related Party Transaction [Line Items]
Due from (to) related parties	25.3	37.9
Evergy Kansas Central | Evergy Metro | Subsidiary of Common Parent
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	28.9	29.5
Lease liability recorded in other current liabilities	0.7	0.6
Total long-term obligations under operating leases	$ 28.2	$ 28.9
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 | Evergy Missouri West
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	18.00%
Jeffrey Energy Center | Evergy Missouri West
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	8.00%
La Cygne Station | Evergy Kansas Central
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	50.00%

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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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

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