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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 30, 2019 USD ($) | Aug. 21, 2019 USD ($) | Jan. 18, 2019 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2019 proposal | Oct. 11, 2019 MW
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 2019- May 2023 |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Term of energy contract |  |  |  |  | 12 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 | Pennsylvania Companies | PPUC | New LTIIPs |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Amount of requested rate increase (decrease) | $ 572.0 |  |  |  |  |
Pennsylvania | Pennsylvania Companies | PPUC | Wavier of DSIC Cap |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Amount of requested rate increase (decrease) (percent) | 11.81% |  |  |  |  |
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) |  | $ (6.1) |  |  |  |
Amount of requested rate increase (decrease) (percent) |  | (0.40%) |  |  |  |
West Virginia | MP and PE | WVPSC | VMS |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Amount of requested rate increase (decrease) |  | $ 7.6 |  |  |  |
Amount of requested rate increase (decrease) (percent) |  | 0.05% |  |  |  |
Subsequent Event | West Virginia | MP and PE | WVPSC | Termination Agreement of PURPA Power Purchase Agreement |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Proposed plant disposal capacity (in MW's) | MW |  |  |  |  |  | 50

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