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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2025 USD ($) | Sep. 25, 2024 USD ($) | Feb. 09, 2022 USD ($) | Jul. 21, 2021 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Feb. 12, 2024 officer
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Total Guarantees and Other Assurances |  |  |  |  |  | $ 923.0 |
Company posted collateral related to net liability positions |  |  |  |  |  | 170.0 |
Collateral received |  |  |  |  |  | 29.0 |
Liabilities incurred |  |  |  |  |  | $ 95.0 |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  | Regulatory liabilities |
United States v. Householder, et al. |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Litigation indictment, number of senior officers | officer |  |  |  |  |  |  | 2
United States v. Householder, et al. | U.S. Attorney's Office |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Term of DPA |  |  |  | 3 years |  |  |
Loss in period |  |  |  | $ 230.0 |  |  |
Term of payments |  |  |  | 60 days |  |  |
United States v. Householder, et al. | United States Treasury |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Proposed penalty |  |  |  | $ 115.0 |  |  |
United States v. Householder, et al. | Ohio Development Service |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Proposed penalty |  |  |  | $ 115.0 |  |  |
Shareholder Derivative Lawsuit |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Proposed penalty |  |  | $ 36.0 |  |  |  |
Settlement payment awarded |  |  | 180.0 |  |  |  |
Litigation settlement, amount awarded, net return on deposited funds |  |  | $ 7.0 |  |  |  |
United States v. Householder, et al. Related OOCIC Investigation |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Loss contingency accrual, period increase (decrease) |  |  |  |  | $ 19.5 |  |
United States v. Householder, et al. Related SEC Investigation |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Payments for legal settlements |  | $ 100.0 |  |  |  |  |
Loss contingency accrual, period increase (decrease) |  |  |  |  | 100.0 |  |
Regulation of Waste Disposal |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Changes in timing and amount of estimated cash flows |  |  |  |  | 139.0 | $ 139.0 |
Accrual for environmental loss contingencies |  |  |  |  |  | 98.0 |
Environmental liabilities former gas facilities |  |  |  |  |  | $ 69.0 |
Regulation of Waste Disposal | Corporate Non Segment |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Liabilities incurred |  |  |  |  | $ 87.0 |  |
Environmental Liability | Subsequent Event |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |
Asset retirement obligation, escrow deposit | $ 160.0 |  |  |  |  |  |
Agreed funding period | 5 years |  |  |  |  |  |

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