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FAIR VALUE MEASUREMENTS - Securities Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Purchases of Investments | $ 2,922.5 | $ 2,863.6 | $ 2,784.2
INDIANA MICHIGAN POWER COMPANY |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Purchases of Investments | 2,902.4 | 2,845.1 | 2,765.4
Spent Nuclear Fuel and Decommissioning Trusts |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from Investment Sales | 2,851.2 | 2,787.5 | 2,713.6
Purchases of Investments | 2,902.4 | 2,845.1 | 2,765.4
Gross Realized Gains on Investment Sales | 125.5 | 99.0 | 52.4
Gross Realized Losses on Investment Sales | 11.5 | 26.6 | 42.6
Spent Nuclear Fuel and Decommissioning Trusts | INDIANA MICHIGAN POWER COMPANY |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Proceeds from Investment Sales | 2,851.2 | 2,787.5 | 2,713.6
Purchases of Investments | 2,902.4 | 2,845.1 | 2,765.4
Gross Realized Gains on Investment Sales | 125.5 | 99.0 | 52.4
Gross Realized Losses on Investment Sales | $ 11.5 | $ 26.6 | $ 42.6

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