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PROPERTY, PLANT, AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Line Items] |  |  |  |
ARO liabilities |  |  | $ 612.4 | $ 38.9
Revision of estimate |  |  | (69.6) | 63.0
INDIANA MICHIGAN POWER COMPANY |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
ARO liabilities |  |  | 85.7 | 4.8
Revision of estimate |  |  | (175.9) | 2.0
Settlement of decommissioning liabilities | $ 4,030.0 |  | 4,030.0 | 3,510.0
Cook Nuclear Plant | INDIANA MICHIGAN POWER COMPANY |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Revision of reclamation costs | 176.0 |  |  |
ARO decommissioning liability | $ 1,970.0 |  | $ 1,970.0 | $ 2,110.0
CCR Rule Revision |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
ARO liabilities |  | $ 602.0 |  |
Revision of estimate |  | $ 72.0 |  |

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