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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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