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FINANCING ACTIVITIES - Schedule of Short-term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Short-Term Debt [Line Items] |  |
Short-term – Securitized Debt of Receivables | $ 900.0 | $ 900.0
Interest Rate | 4.56% | 4.73%
Commercial Paper | $ 250.0 | $ 1,618.3
Total Short-term Debt | 1,157.7 | 2,523.8
SWEPCo |  |
Short-Term Debt [Line Items] |  |
Notes Payable | 7.7 | 5.5
Total Short-term Debt | $ 7.7 | $ 5.5
Commercial Paper |  |
Short-Term Debt [Line Items] |  |
Weighted-Average Interest Rate | 4.30% | 4.70%
Notes Payable | SWEPCo |  |
Short-Term Debt [Line Items] |  |
Weighted-Average Interest Rate | 6.50% | 6.69%

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