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FAIR VALUE MEASUREMENTS - Fixed Income Securities Held in Nuclear Trusts (Details) - Spent Nuclear Fuel and Decommissioning Trusts $ in Millions | Dec. 31, 2024 USD ($)
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Within 1 year | $ 376.4
After 1 year through 5 years | 598.8
After 5 years through 10 years | 236.2
After 10 years | 322.7
Total | 1,534.1
INDIANA MICHIGAN POWER COMPANY |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Within 1 year | 376.4
After 1 year through 5 years | 598.8
After 5 years through 10 years | 236.2
After 10 years | 322.7
Total | $ 1,534.1

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