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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions			1 Months Ended	3 Months Ended
	Jan. 18, 2019 USD ($)	Aug. 31, 2018 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2019 proposal
Pennsylvania | DSP June 2017- May 2019
Regulatory Matters [Line Items]
Number of RFP's | proposal				1
RFP term				2 years
Pennsylvania | DSP June 2019- May 2023
Regulatory Matters [Line Items]
Number of RFP's | proposal				2
RFP term				2 years
Pennsylvania | Three Month Period | DSP June 2019- May 2023
Regulatory Matters [Line Items]
Term of energy contract				3 months
Pennsylvania | Twelve month period | DSP June 2017- May 2019
Regulatory Matters [Line Items]
Term of energy contract				12 months
Pennsylvania | Twelve month period | DSP June 2019- May 2023
Regulatory Matters [Line Items]
Term of energy contract				12 months
Pennsylvania | Twenty-four month period | DSP June 2017- May 2019
Regulatory Matters [Line Items]
Term of energy contract				24 months
Pennsylvania | Twenty-four month period | DSP June 2019- May 2023
Regulatory Matters [Line Items]
Term of energy contract				24 months
Pennsylvania | Pennsylvania Companies | PPUC | EE&C Phase III
Regulatory Matters [Line Items]
Approved amount of annual increase			$ (390.0)
Pennsylvania | ME
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	$ (45.0)
Pennsylvania | Penn
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	(26.0)
Pennsylvania | WP
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	(51.0)
Pennsylvania | PN
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	$ (25.0)
West Virginia | MP and PE | WVPSC | ENEC
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)		$ (100.9)
Net annual effect on rates		25.6
West Virginia | MP and PE | WVPSC | Elimination of Energy Efficiency Cost Rate Surcharge
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)		$ (2.1)
Requested rate decrease (percentage)		(7.20%)

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