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RELATED PARTY TRANSACTIONS - Costs Paid (Details) - Barging, Urea Transloading And Other Transportion Services - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AEGCo |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, amount | $ 10.0 | $ 9.3 | $ 11.3
APPALACHIAN POWER COMPANY |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, amount | 47.0 | 39.2 | 36.1
KPCo |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, amount | 0.0 | 0.0 | 2.0
WPCo |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, amount | $ 7.5 | $ 10.6 | $ 4.7

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