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Regulatory Matters - Ohio (Details) $ in Millions							12 Months Ended
	Nov. 09, 2018 USD ($)	Apr. 25, 2018 USD ($)	Mar. 12, 2018	Dec. 01, 2017 USD ($)	Oct. 12, 2016 USD ($)	Aug. 07, 2013 USD ($) auction	Dec. 31, 2018	Sep. 30, 2018 USD ($)	Feb. 15, 2018 USD ($)
Regulatory Matters [Line Items]
Proposed reduction in power plants carbon pollution (percent)							90.00%
Ohio
Regulatory Matters [Line Items]
Portfolio plan estimated cost								$ 268.0
Credit to non-shopping customers						$ 43.4
Ohio | PUCO
Regulatory Matters [Line Items]
Proposed reduction in power plants carbon pollution (percent)					90.00%
Requested removal of cost cap			4.00%
Number of renewable energy auctions | auction						1,000,000
Gain related to litigation settlement		$ 72.0
Ohio | PUCO | Distribution Modernization Rider
Regulatory Matters [Line Items]
Annual revenue cap for rider					$ 132.5
Cost recovery period					3 years
Possible extension period					2 years
Approved annual revenue cap amount for rider					$ 168.0
Excessive earnings test cost recovery exclusion period					3 years
Potential extension period for excessive earnings test cost recovery					2 years
Ohio | PUCO | DCR Rider
Regulatory Matters [Line Items]
Increased annual revenue cap for rider					$ 30.0
Revenue cap for Rider for years 3-6					20.0
Revenue cap for Rider for years 6-8					15.0
Ohio | PUCO | DPM Plan
Regulatory Matters [Line Items]
Requested rate increase (decrease)				$ 450.0
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 | Ohio | PUCO
Regulatory Matters [Line Items]
Impact on base rate due to Tax Act									$ 40.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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