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RATE MATTERS AND REGULATION - Regulatory Matters Asset (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Assets [Line Items]
Regulatory Assets	$ 2,074.4	$ 1,972.2
Less: current portion	(206.2)	(231.7)
Total noncurrent regulatory assets	1,868.2	1,740.5
Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	867.8	795.9
Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	98.9	105.8
Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	104.0	112.0
Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	116.2	114.3
Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	70.0	55.3
Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	183.4	129.3
Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	170.8	167.1
Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	24.1	29.9
Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	21.5	22.6
Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	6.9	7.1
Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	25.4	26.1
Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	28.9	21.7
Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	14.5	14.8
La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	12.4	13.7
Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	16.3	18.0
Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	26.2	34.7
Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	25.9	39.8
Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	10.0	31.0
Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	49.8	31.8
Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	128.4	130.5
Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	37.6	42.3
Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	35.4	28.5
Evergy Kansas Central
Regulatory Assets [Line Items]
Regulatory Assets	896.3	823.7
Less: current portion	(96.2)	(93.3)
Total noncurrent regulatory assets	800.1	730.4
Evergy Kansas Central | Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	412.9	359.9
Evergy Kansas Central | Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	91.3	97.3
Evergy Kansas Central | Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central | Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central | Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	52.7	55.3
Evergy Kansas Central | Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	125.7	94.4
Evergy Kansas Central | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	55.0	52.8
Evergy Kansas Central | Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	24.1	29.9
Evergy Kansas Central | Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	21.5	22.6
Evergy Kansas Central | Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central | Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central | Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	23.7	18.7
Evergy Kansas Central | Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	14.5	14.8
Evergy Kansas Central | La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	10.1	11.2
Evergy Kansas Central | Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	5.7	6.2
Evergy Kansas Central | Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	1.2	0.0
Evergy Kansas Central | Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central | Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	5.0	15.5
Evergy Kansas Central | Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	12.8	7.4
Evergy Kansas Central | Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central | Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	18.0	20.3
Evergy Kansas Central | Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	22.1	17.4
Evergy Metro
Regulatory Assets [Line Items]
Regulatory Assets	615.5	559.8
Less: current portion	(82.0)	(95.4)
Total noncurrent regulatory assets	533.5	464.4
Evergy Metro | Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	359.9	330.7
Evergy Metro | Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	6.8	7.5
Evergy Metro | Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro | Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro | Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	9.4	0.0
Evergy Metro | Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	57.7	34.9
Evergy Metro | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	84.0	79.4
Evergy Metro | Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro | Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro | Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	2.8	2.8
Evergy Metro | Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	12.7	13.1
Evergy Metro | Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	5.2	3.0
Evergy Metro | Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro | La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	2.3	2.5
Evergy Metro | Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	8.6	8.3
Evergy Metro | Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	17.7	16.6
Evergy Metro | Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	1.5	9.0
Evergy Metro | Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	5.0	15.5
Evergy Metro | Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	23.4	15.6
Evergy Metro | Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro | Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	13.9	15.6
Evergy Metro | Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	$ 4.6	$ 5.3

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