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REGULATORY MATTERS - Ohio (Details) - USD ($) $ in Millions					12 Months Ended
	Nov. 24, 2020	Jul. 17, 2019	Jul. 15, 2019	Oct. 12, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 01, 2021	Feb. 01, 2020	Jan. 31, 2020
Regulatory Matters [Line Items]
Proposed reduction in power plants carbon pollution (percent)					90.00%
Ohio | PUCO
Regulatory Matters [Line Items]
Proposed reduction in power plants carbon pollution (percent)				90.00%
Ohio | PUCO | DCR Rider
Regulatory Matters [Line Items]
Revenue cap for Rider for years 3-6				$ 20.0
Revenue cap for Rider for years 6-8				15.0
Ohio | PUCO | DMR
Regulatory Matters [Line Items]
Annual revenue cap for rider							$ 132.5
Cost recovery period							3 years
Approved annual revenue cap for rider						$ 168.0	$ 168.0
Requested extension period	2 years
Ohio | PUCO | DPM Plan
Regulatory Matters [Line Items]
Approved amount of rate increase		$ 516.0
Grid modernization plan period		3 years
Ohio | PUCO | Energy Conservation, Economic Development and Job Retention
Regulatory Matters [Line Items]
Contribution amount				$ 51.0
Ohio Companies | PUCO | Rider CSR
Regulatory Matters [Line Items]
Regulatory asset balance									$ 0.0	$ 113.0
Ohio Companies | Ohio | PUCO | Ohio Consumers Counsel DMR Refund
Regulatory Matters [Line Items]
Amount of damages sought			$ 42.0
Ohio Companies | Ohio | PUCO | Rider CSR
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset					$ 108.0
Impairment of regulatory asset, net					84.0
Lost distribution revenue					$ 77.0
Ohio Companies | Ohio | PUCO | Rider CSR | Subsequent Event
Regulatory Matters [Line Items]
Regulatory asset balance								$ 0.0

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