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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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