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ASSET RETIREMENT OBLIGATIONS - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |
Increase to ARO to decommission Wolf Creek resulting from study | $ 259.1
Evergy Kansas Central |
Jointly Owned Utility Plant Interests [Line Items] |
Increase to ARO to decommission Wolf Creek resulting from study | 140.7
Evergy Metro |
Jointly Owned Utility Plant Interests [Line Items] |
Increase to ARO to decommission Wolf Creek resulting from study | $ 118.4

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