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Regulatory Matters - Ohio (Details) - OHIO - PUCO - USD ($) $ in Millions						6 Months Ended
	Jun. 16, 2021	Nov. 24, 2020	Jul. 17, 2019	Jul. 15, 2019	Jun. 01, 2016	Jun. 30, 2021	Dec. 31, 2020
Regulatory Matters [Line Items]
Proposed goal to reduce CO2 pollution (percent)					90.00%
Energy Conservation, Economic Development and Job Retention
Regulatory Matters [Line Items]
Contribution amount					$ 51.0
Distribution Modernization Rider
Regulatory Matters [Line Items]
Requested plan extension period		2 years
Delivery Capital Recovery Rider
Regulatory Matters [Line Items]
Annual revenue cap for rider for years three through six					20.0
Annual revenue cap for rider for years six through eight					$ 15.0
OCC DMR Refund | The Ohio Companies
Regulatory Matters [Line Items]
Loss contingency, damages sought				$ 42.0
Distribution Platform Modernization Plan
Regulatory Matters [Line Items]
Approved amount of annual increase (decrease)			$ (516.0)
Period of grid modernization plan			3 years
Decoupling Rider | The Ohio Companies
Regulatory Matters [Line Items]
Amount of refunds announced						$ 27.0
Rider CSR | The Ohio Companies
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset							$ 108.0
Impairment of regulatory asset, net							84.0
Lost distribution revenue							$ 77.0
Rider DCR | The Ohio Companies
Regulatory Matters [Line Items]
Approved amount of annual increase (decrease)	$ 3.7

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