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REGULATORY MATTERS - Ohio (Details) - Ohio - PUCO $ in Millions				3 Months Ended	12 Months Ended
	Nov. 01, 2021 USD ($)	Jun. 16, 2021 USD ($)	Jun. 01, 2016 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Sep. 13, 2021 requirement	Feb. 01, 2021 USD ($)
Regulatory Matters [Line Items]
Proposed reduction in power plants carbon pollution (percent)			90.00%
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 Stipulation
Regulatory Matters [Line Items]
Rate refunds	$ 210.0
Rate refund in 2022	80.0
Rate refund in 2023	60.0
Rate refund in 2024	45.0
Rate refund in 2025	25.0
Ohio Stipulation | Regulated Distribution
Regulatory Matters [Line Items]
Pre-tax charges				$ 96.0
Energy Conservation, Economic Development and Job Retention
Regulatory Matters [Line Items]
Contribution amount			$ 51.0
Ohio Companies | Rider CSR
Regulatory Matters [Line Items]
Regulatory asset balance							$ 0.0
Pre-tax impairment of regulatory asset				108.0	$ 108.0
Impairment of regulatory asset, net				84.0	84.0
Lost distribution revenue				$ 77.0	77.0
Ohio Companies | Decoupling Rider
Regulatory Matters [Line Items]
Proposed penalty					$ 27.0
Ohio Companies | Rider Delivery Capital Recovery
Regulatory Matters [Line Items]
Approved amount of rate increase (decrease)		$ (3.7)
Ohio Companies | Rider Delivery Capital Recovery Audit Report
Regulatory Matters [Line Items]
Number of minor non-compliance with requirements | requirement						8
Number of requirements were in compliance | requirement						23
Ohio Companies | SEET 2017-2019 Cases
Regulatory Matters [Line Items]
Rate refunds	$ 96.0

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