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FINANCING ACTIVITIES - Schedule of Accounts Receivable and Accrued Unbilled Revenues (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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APCo |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | $ 228.0 | $ 192.7
I&M |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 194.6 | 160.5
OPCo |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 498.4 | 470.7
PSO |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | 104.7 | 111.4
SWEPCo |  |
Short-Term Debt [Line Items] |  |
Accounts receivable and accrued unbilled revenues | $ 145.9 | $ 153.5

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