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Regulatory Matters - Ohio (Details) - USD ($) $ in Millions					6 Months Ended		9 Months Ended
	Nov. 02, 2020	Jul. 15, 2019	Nov. 09, 2018	Jun. 01, 2016	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2020
Regulatory Matters [Line Items]
Proposed goal to reduce CO2 pollution (percent)							90.00%
OHIO | PUCO
Regulatory Matters [Line Items]
Proposed goal to reduce CO2 pollution (percent)				90.00%
OHIO | PUCO | Energy Conservation, Economic Development and Job Retention
Regulatory Matters [Line Items]
Contribution amount				$ 51.0
OHIO | Distribution Modernization Rider | PUCO
Regulatory Matters [Line Items]
Annual revenue cap for rider						$ 132.5
Recovery period						3 years
Approved amount for rider					$ 168.0
OHIO | Delivery Capital Recovery Rider | PUCO
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
OHIO | Distribution Platform Modernization Plan | PUCO
Regulatory Matters [Line Items]
Approved amount of annual increase (decrease)			$ 516.0
Period of grid modernization plan			3 years
The Ohio Companies | OHIO | OCC DMR Refund | PUCO
Regulatory Matters [Line Items]
Loss contingency, damages sought		$ 42.0
The Ohio Companies | OHIO | HB 6 | PUCO
Regulatory Matters [Line Items]
Regulatory assets							$ 100.0
Estimated lost distribution revenue							63.0
Pre-tax net impact of lost distribution revenues							$ 37.0
The Ohio Companies | OHIO | Decoupling Rider | PUCO | Subsequent Event
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	$ 113.0

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