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RATE MATTERS AND REGULATION - Regulatory Matters Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 2,725.5 | $ 2,722.2
Less: current portion | (183.0) | (155.4)
Total noncurrent regulatory liabilities | 2,542.5 | 2,566.8
Taxes refundable through future rates |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 1,737.8 | 1,866.6
Deferred regulatory gain from sale leaseback |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 31.6 | 37.1
Emission allowances |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 34.2 | 38.2
Nuclear decommissioning |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 318.7 | 246.3
Pension and post-retirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 124.8 | 98.4
Jurisdictional allowance for funds used during construction |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 24.4 | 25.9
La Cygne leasehold dismantling costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 29.6 | 29.6
Kansas tax credits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 16.8 | 23.5
Purchase power agreement |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 3.7 | 4.1
Regulatory Liability, Amortization Period | 5 years |
Fuel recovery mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 34.7 | 4.7
Regulatory Liability, Amortization Period | 1 year |
February 2021 winter weather event |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 13.0 | 37.8
Sibley AAO |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 79.2 | 108.0
Regulatory Liability, Amortization Period | 4 years |
TFR Refund |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 11.2 | 55.5
COLI rate credits refund |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 96.5 | 0.0
Regulatory Liability, Amortization Period | 3 years |
Phase-in plan |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 38.1 | 25.1
Other regulatory liabilities |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 131.2 | 121.4
Evergy Kansas Central |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 1,536.5 | 1,441.0
Less: current portion | (104.1) | (72.1)
Total noncurrent regulatory liabilities | 1,432.4 | 1,368.9
Evergy Kansas Central | Taxes refundable through future rates |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 1,047.2 | 1,084.2
Evergy Kansas Central | Deferred regulatory gain from sale leaseback |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 31.6 | 37.1
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 | 125.5 | 103.4
Evergy Kansas Central | Pension and post-retirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 21.9 | 23.0
Evergy Kansas Central | Jurisdictional allowance for funds used during construction |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 22.7 | 24.2
Evergy Kansas Central | La Cygne leasehold dismantling costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 29.6 | 29.6
Evergy Kansas Central | Kansas tax credits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 16.8 | 23.5
Evergy Kansas Central | Purchase power agreement |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 3.7 | 4.1
Evergy Kansas Central | Fuel recovery mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 34.7 | 4.5
Evergy Kansas Central | February 2021 winter weather event |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 0.0 | 0.0
Evergy Kansas Central | Sibley AAO |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 0.0 | 0.0
Evergy Kansas Central | TFR Refund |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 11.2 | 55.5
Evergy Kansas Central | COLI rate credits refund |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 96.5 | 0.0
Evergy Kansas Central | Phase-in plan |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 38.1 | 25.1
Evergy Kansas Central | Other regulatory liabilities |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 57.0 | 26.8
Evergy Metro |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 903.2 | 928.1
Less: current portion | (43.0) | (55.3)
Total noncurrent regulatory liabilities | 860.2 | 872.8
Evergy Metro | Taxes refundable through future rates |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 519.2 | 586.6
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 | 34.2 | 38.2
Evergy Metro | Nuclear decommissioning |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 193.2 | 142.9
Evergy Metro | Pension and post-retirement costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 100.5 | 72.5
Evergy Metro | Jurisdictional allowance for funds used during construction |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 1.7 | 1.7
Evergy Metro | La Cygne leasehold dismantling costs |  |
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 | 0.2
Evergy Metro | February 2021 winter weather event |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 13.0 | 37.8
Evergy Metro | Sibley AAO |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 0.0 | 0.0
Evergy Metro | TFR Refund |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 0.0 | 0.0
Evergy Metro | COLI rate credits refund |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 0.0 | 0.0
Evergy Metro | Phase-in plan |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 0.0 | 0.0
Evergy Metro | Other regulatory liabilities |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | $ 41.4 | $ 48.2

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481854/980-405-25-1 + Details
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- Definition 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. + Details
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- Definition Amortization period for the recovery of regulatory liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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