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FAIR VALUE MEASUREMENTS - NAV (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) fund extension | Dec. 31, 2022 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Commitments | $ 1.4 | $ 1.5
Evergy Kansas Central | Alternative investments fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Commitments | 0.0 | 0.0
Evergy Kansas Central | Real estate securities fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Commitments | 0.0 | 0.0
Domestic | Evergy Kansas Central | Equity securities |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Unfunded Commitments | $ 1.4 | 1.5
NAV, number of funds | fund | 5 |
NAV, number of funds making distributions | fund | 3 |
Domestic | Evergy Kansas Central | Equity Securities - Fourth Fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Length of settlement | 15 years |
NAV, number of extensions | extension | 3 |
NAV, extension term | 1 year |
Domestic | Evergy Kansas Central | Equity Securities - Fifth Fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Length of settlement | 15 years |
Fair Value, Measurements, Recurring |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | $ 766.4 | 653.3
Total rabbi trust | 33.3 | 34.1
Total Assets | 858.1 | 748.9
Fair Value, Measurements, Recurring | Evergy Kansas Central |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | 365.1 | 318.8
Total rabbi trust | 24.5 | 24.9
Total Assets | 430.5 | 393.6
Fair Value, Measurements, Recurring | Evergy Kansas Central | Alternative investments fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | 37.9 | 31.8
Fair Value, Measurements, Recurring | Evergy Kansas Central | Real estate securities fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | 17.2 | 18.9
Fair Value, Measurements, Recurring | Evergy Kansas Central | Core bond fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | 56.2 | 51.0
Fair Value, Measurements, Recurring | Evergy Kansas Central | Combination debt/equity/other fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total rabbi trust | 1.7 | 1.9
Fair Value, Measurements, Recurring | Other Evergy |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total rabbi trust | 8.8 | 9.2
Total Assets | 10.6 | 9.6
Fair Value, Measurements, Recurring | Other Evergy | Core bond fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total rabbi trust | 8.8 | 9.2
Fair Value, Measurements, Recurring | Domestic | Evergy Kansas Central | Equity securities |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | 133.1 | 112.5
NAV | Fair Value, Measurements, Recurring |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | 64.9 | 62.8
Total rabbi trust | 0.0 | 0.0
Total Assets | 64.9 | 62.8
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | 64.9 | 62.8
Total rabbi trust | 0.0 | 0.0
Total Assets | 64.9 | 62.8
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Alternative investments fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | $ 37.9 | 31.8
Length of Settlement | 65 days |
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Real estate securities fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | $ 17.2 | 18.9
Length of Settlement | 65 days |
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Core bond fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | $ 0.0 | 0.0
NAV | Fair Value, Measurements, Recurring | Evergy Kansas Central | Combination debt/equity/other fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total rabbi trust | 0.0 | 0.0
NAV | Fair Value, Measurements, Recurring | Other Evergy |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total rabbi trust | 0.0 | 0.0
Total Assets | 0.0 | 0.0
NAV | Fair Value, Measurements, Recurring | Other Evergy | Core bond fund |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total rabbi trust | 0.0 | 0.0
NAV | Fair Value, Measurements, Recurring | Domestic | Evergy Kansas Central | Equity securities |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total nuclear decommissioning trust | $ 9.8 | $ 12.1

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