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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 09, 2022 USD ($) | Jul. 21, 2021 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) | Feb. 12, 2024 officer
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  | $ 978.0 |  | $ 978.0 |
Company posted collateral related to net liability positions |  |  | 160.0 |  | 160.0 |
Collateral received |  |  | 35.0 |  | 35.0 |
Liabilities incurred |  |  |  |  | 95.0 |
United States v. Householder, et al. |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
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] |  |  |  |  |  |
Amount of refunds announced |  | $ 115.0 |  |  |  |
United States v. Householder, et al. Related SEC Investigation |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Other operating expenses |  |  |  | $ 100.0 |  |
United States v. Householder, et al. Related OOCIC Investigation |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Other operating expenses |  |  |  | 19.5 |  |
Shareholder Derivative Lawsuit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Amount of refunds announced | $ 36.0 |  |  |  |  |
Amount awarded from other party | 180.0 |  |  |  |  |
Net return on deposited funds | $ 7.0 |  |  |  |  |
Regulation of Waste Disposal |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Changes in timing and amount of estimated cash flows |  |  | 25.0 | 125.0 |  |
Accrual for environmental loss contingencies |  |  | 96.0 |  | 96.0 |
Environmental liabilities former gas facilities |  |  | 69.0 |  | 69.0 |
Regulation of Waste Disposal | Corporate Non Segment |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Liabilities incurred |  |  |  | $ 87.0 |  |
Changes in timing and amount of estimated cash flows |  |  | 25.0 |  |  |
FE |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  | 517.0 |  | 517.0 |
Other Assurances |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  | $ 461.0 |  | $ 461.0 |

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