PROPERTY, PLANT AND EQUIPMENT (Details) $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2025
USD ($)
| |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |
| ARO as of December 31, 2024 | $ 3,611.7 |
| Accretion Expense | 84.6 |
| Liabilities Incurred | 17.4 |
| Liabilities Settled | (42.4) |
| Revisions in Cash Flow Estimates | 34.8 |
| ARO as of June 30, 2025 | 3,706.1 |
| PSO | |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |
| ARO as of December 31, 2024 | 121.8 |
| Accretion Expense | 3.6 |
| Liabilities Incurred | 15.5 |
| Liabilities Settled | (1.3) |
| Revisions in Cash Flow Estimates | (2.8) |
| ARO as of June 30, 2025 | 136.8 |
| SWEPCo | |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |
| ARO as of December 31, 2024 | 278.7 |
| Accretion Expense | 8.7 |
| Liabilities Incurred | 0.0 |
| Liabilities Settled | (27.5) |
| Revisions in Cash Flow Estimates | 31.6 |
| ARO as of June 30, 2025 | $ 291.5 |