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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2020 | Mar. 11, 2020 | Aug. 30, 2019 USD ($) | Aug. 21, 2019 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2020 | Jun. 30, 2020 USD ($) proposal | Jun. 18, 2020 | Dec. 31, 2019 USD ($) | Oct. 11, 2019 MW
ATSI | FERC |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  | $ 76.0 |  | $ 73.0 |
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 |  |  |  |  |  |  |
Recovery period |  |  | 5 years |  |  |  |  |  |  |
Pennsylvania | Pennsylvania Companies | PPUC | Wavier of DSIC Cap |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) (percent) |  |  | 11.81% |  |  |  |  |  |  |
Approved ROE |  | 5.00% |  |  |  |  |  |  |  |
Temporary increase in rate cap | 7.50% |  |  |  |  |  |  |  |  |
Pennsylvania | ME | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  | 2.90% |  |
Energy consumption reduction targets |  |  |  |  |  |  |  | 3.10% |  |
Pennsylvania | PN | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  | 3.30% |  |
Energy consumption reduction targets |  |  |  |  |  |  |  | 3.00% |  |
Pennsylvania | Penn | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  | 2.00% |  |
Energy consumption reduction targets |  |  |  |  |  |  |  | 2.70% |  |
Pennsylvania | WP | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  | 2.50% |  |
Energy consumption reduction targets |  |  |  |  |  |  |  | 2.40% |  |
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 | Termination Agreement of PURPA Power Purchase Agreement |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed plant disposal capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  | 50
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% |  |  |  |  |  |
Maintenance cycle |  |  |  |  |  | 4 years | 5 years |  |  |

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