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RATE MATTERS AND REGULATION - Regulatory Matters Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 2,664.9	$ 2,311.6
Less: current portion	(26.1)	(63.3)
Total noncurrent regulatory liabilities	2,638.8	2,248.3
Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,055.7	1,656.5
Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	48.1	53.6
Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	46.1	50.1
Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	319.7	267.3
Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	50.8	59.3
Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	28.7	28.7
La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.6
Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	4.4	49.1
Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	17.0
Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	6.3	7.4
Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	1.3	34.1
Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	18.4	10.2
Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	55.8	48.7
Evergy Kansas Central
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,472.9	1,174.8
Less: current portion	(11.9)	(42.3)
Total noncurrent regulatory liabilities	1,461.0	1,132.5
Evergy Kansas Central | Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,184.5	856.4
Evergy Kansas Central | Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	48.1	53.6
Evergy Kansas Central | Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central | Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	138.2	116.5
Evergy Kansas Central | Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	31.4	31.5
Evergy Kansas Central | Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	27.0	28.7
Evergy Kansas Central | La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.6
Evergy Kansas Central | Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central | Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	17.0
Evergy Kansas Central | Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	6.3	7.4
Evergy Kansas Central | Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	30.2
Evergy Kansas Central | Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central | Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	7.8	3.9
Evergy Metro
Regulatory Liabilities [Line Items]
Regulatory liabilities	907.4	803.6
Less: current portion	(8.0)	(11.4)
Total noncurrent regulatory liabilities	899.4	792.2
Evergy Metro | Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	650.2	568.9
Evergy Metro | Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	46.1	50.1
Evergy Metro | Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	181.5	150.8
Evergy Metro | Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	13.1	20.3
Evergy Metro | Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	1.7	0.0
Evergy Metro | La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 14.8	$ 13.5

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- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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