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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 30, 2018 USD ($) | Mar. 09, 2018 USD ($) | Jun. 14, 2017 USD ($) | Jan. 19, 2017 USD ($) | Dec. 09, 2016 USD ($) | Jun. 19, 2015 | Mar. 31, 2016 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 proposal | Dec. 31, 2017 USD ($) | Sep. 23, 2016 program
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] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  | $ (96.0) |  |  |  |  |  |  |  |
Pennsylvania | ME | PPUC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed |  |  |  |  |  | 1.80% |  |  |  |  |  |
Energy consumption reduction targets proposed |  |  |  |  |  | 4.00% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | $ (51.3) |  |  |  |  |  |  |  |  |
Net annual effect on rates |  | $ 37.0 |  |  |  |  |  |  |  |  |  |
Pennsylvania | Penn |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  | (29.0) |  |  |  |  |  |  |  |
Pennsylvania | Penn | PPUC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed |  |  |  |  |  | 1.70% |  |  |  |  |  |
Energy consumption reduction targets proposed |  |  |  |  |  | 3.30% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | (33.2) |  |  |  |  |  |  |  |  |
Net annual effect on rates |  | 9.0 |  |  |  |  |  |  |  |  |  |
Pennsylvania | WP |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  | (66.0) |  |  |  |  |  |  |  |
Pennsylvania | WP | PPUC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed |  |  |  |  |  | 1.80% |  |  |  |  |  |
Energy consumption reduction targets proposed |  |  |  |  |  | 2.60% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | (50.1) |  |  |  |  |  |  |  |  |
Net annual effect on rates |  | 30.0 |  |  |  |  |  |  |  |  |  |
Pennsylvania | PN |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  | $ (100.0) |  |  |  |  |  |  |  |
Pennsylvania | PN | PPUC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed |  |  |  |  |  | 0.00% |  |  |  |  |  |
Energy consumption reduction targets proposed |  |  |  |  |  | 3.90% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | $ (44.8) |  |  |  |  |  |  |  |  |
Net annual effect on rates |  | $ 40.0 |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net annual effect on rates | $ 26.2 |  |  |  |  |  |  |  |  |  |  |
Number of proposed efficient programs | program |  |  |  |  |  |  |  |  |  |  |  | 3
Energy efficient reduction requirement (percent) |  |  |  |  |  |  |  |  |  |  |  | 0.50%
Expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  | $ 10.4 |
West Virginia | MP and PE | WVPSC | ENEC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  | $ (25.0) |  |  |  |  |  |  |
Rate stabilization period |  |  |  |  | 2 years |  |  |  |  |  |  |
Scenario, Forecast | Pennsylvania | PPUC | Temporary Rates Order Tracked Value |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rate filing period |  |  |  |  |  |  |  | 3 years |  |  |  |
Scenario, Forecast | Pennsylvania | ME | PPUC | Temporary Rates Order |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  |  | $ (19.0) |  |  |
Rate filing period |  |  |  |  |  |  |  |  | 6 months |  |  |
Scenario, Forecast | Pennsylvania | ME | PPUC | Temporary Rates Order Tracked Value |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  | $ 12.0 |  |  |  |
Scenario, Forecast | Pennsylvania | Penn | PPUC | Temporary Rates Order |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  |  | $ (5.0) |  |  |
Scenario, Forecast | Pennsylvania | Penn | PPUC | Temporary Rates Order Tracked Value |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  | 3.0 |  |  |  |
Scenario, Forecast | Pennsylvania | WP | PPUC | Temporary Rates Order |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  |  | (15.0) |  |  |
Scenario, Forecast | Pennsylvania | WP | PPUC | Temporary Rates Order Tracked Value |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  | 10.0 |  |  |  |
Scenario, Forecast | Pennsylvania | PN | PPUC | Temporary Rates Order |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  |  | $ (20.0) |  |  |
Scenario, Forecast | Pennsylvania | PN | PPUC | Temporary Rates Order Tracked Value |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  | $ 13.0 |  |  |  |

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