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Regulatory Matters - Ohio (Details) $ in Millions |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 12, 2016 USD ($) | Apr. 15, 2016 | Aug. 07, 2013 USD ($) auction | Sep. 30, 2017 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% |  |  |
Number of renewable energy auctions | auction |  |  | 1 |
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 | $ 204.0 |  |  |
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 | Energy Conservation, Economic Development and Job Retention | PUCO |  |  |  |
Regulatory Matters [Line Items] |  |  |  |
Contribution amount | $ 51.0 |  |  |

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