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Regulatory Matters - Ohio (Details) $ in Millions |  |  |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 25, 2018 USD ($) | Mar. 12, 2018 | Dec. 01, 2017 USD ($) | Oct. 12, 2016 USD ($) | Apr. 15, 2016 | Aug. 07, 2013 USD ($) auction | Sep. 30, 2018 USD ($) | Feb. 15, 2018 USD ($)
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  |  |  |  | 90.00% |
Ohio |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Energy efficient portfolio plan term |  |  |  |  | 3 years |  |  |
Estimated cost of plans |  |  |  |  |  |  | $ 268.0 |
Credit to non-shopping customers |  |  |  |  |  | $ 43.4 |  |
Ohio | PUCO |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  | 90.00% |  |  |  |
Requested removal of cost cap |  | 4.00% |  |  |  |  |  |
Number of renewable energy auctions | auction |  |  |  |  |  | 1 |  |
Reversal of reserve | $ 72.0 |  |  |  |  |  |  |
Ohio | Distribution Modernization Rider |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Amount of rider valuation |  |  |  | $ 558.0 |  |  |  |
Period of rider valuation |  |  |  | 8 years |  |  |  |
Ohio | Distribution Modernization Rider | PUCO |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Annual revenue cap for rider |  |  |  | $ 132.5 |  |  |  |
Recovery period |  |  |  | 3 years |  |  |  |
Possible extension period |  |  |  | 2 years |  |  |  |
Approved amount for rider |  |  |  | $ 168.0 |  |  |  |
Excessive earnings test exclusion period |  |  |  | 3 years |  |  |  |
Renewal period for excessive earnings test exclusion period |  |  |  | 2 years |  |  |  |
Ohio | Delivery Capital Recovery Rider | PUCO |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Annual revenue cap for rider |  |  |  | $ 30.0 |  |  |  |
Annual revenue cap for rider for years three through six |  |  |  | 20.0 |  |  |  |
Annual revenue cap for rider for years six through eight |  |  |  | 15.0 |  |  |  |
Ohio | Distribution Platform Modernization Plan | PUCO |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | $ 450.0 |  |  |  |  |
Ohio | Energy Conservation, Economic Development and Job Retention | PUCO |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Contribution amount |  |  |  | $ 51.0 |  |  |  |
The Ohio Companies | Ohio | PUCO |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Impact on base rate |  |  |  |  |  |  |  | $ 40.0

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