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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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