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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Clean Water Act, Regulation of Waste Disposal and Other Legal Proceedings (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 29, 2020 director | Feb. 01, 2020 USD ($) | Jan. 31, 2020 USD ($) | Nov. 04, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of additional executives terminated | director |  |  | 2 |  |  |
Amount of violation of code of conduct payment |  | $ 4.0 |  |  |  |
PUCO | Ohio Companies | Rider CSR |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory asset balance |  |  |  | $ 0.0 | $ 113.0 |
Clean Water Act |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Renewal cycle of waste water discharge permit | 5 years |  |  |  |  |
Clean Water Act | EPA |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Proposed penalty |  |  |  |  |  | $ 900.0
Regulation of Waste Disposal |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrual for environmental loss contingencies | $ 107.0 |  |  |  |  |
Environmental liabilities former gas facilities | $ 67.0 |  |  |  |  |

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