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Regulatory Matters - Ohio (Details) MWh in Thousands, $ in Millions |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 25, 2016 USD ($) | Jun. 29, 2016 USD ($) | Apr. 15, 2016 USD ($) | Aug. 07, 2013 USD ($) auction | Mar. 20, 2013 | Jun. 30, 2016 USD ($) MWh MW
Regulatory Matters [Line Items] |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  |  |  | 90.00%
Ohio |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Recovery period |  |  |  |  |  | 5 years
Costs avoided by customers |  |  |  |  |  | $ 360.0
Proposed goal to reduce CO2 pollution (percent) |  |  |  |  |  | 90.00%
Term of proposed purchase power agreement |  |  |  |  |  | 8 years
Energy efficient portfolio plan term |  |  |  |  | 3 years |
Credit to non-shopping customers |  |  |  | $ 43.4 |  |
Ohio | Year 2015 |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Annual energy savings (in GWH) | MWh |  |  |  |  |  | 2,266
Ohio | Year 2016 |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Annual energy savings (in GWH) | MWh |  |  |  |  |  | 2,288
Ohio | Year 2017 |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Annual increase in energy savings (percent) |  |  |  |  |  | 1.00%
Ohio | Annually Through 2020 |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Utilities required to additionally reduce peak demand |  |  |  |  |  | 0.75%
Ohio | Wind or Solar Power |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Proposed potential plant acquisition (MW) | MW |  |  |  |  |  | 100
Ohio | PUCO |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Number of renewable energy auctions | auction |  |  |  | 1 |  |
Approved period to limit average customer bill |  |  |  |  |  | 2 years
Ohio | Ohio Companies | PUCO |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Expenditures for cost recovery program |  |  | $ 323.0 |  |  |
Ohio | Retail Rate Stability Rider |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Guaranteed credits, year five |  |  |  |  |  | $ 10.0
Guaranteed credits, year six |  |  |  |  |  | 20.0
Guaranteed credits, year seven |  |  |  |  |  | 30.0
Guaranteed credits, year eight |  |  |  |  |  | $ 40.0
Ohio | Retail Rate Stability Rider | FES |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Term of proposed purchase power agreement |  |  |  |  |  | 8 years
Ohio | Delivery Capital Recovery Rider |  |  |  |  |  |
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 Modernization Rider |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Recovery period |  | 3 years |  |  |  |
Annual revenue cap for rider |  | $ 131.0 |  |  |  |
Ohio | Distribution Modernization Rider | Subsequent Event |  |  |  |  |  |
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] |  |  |  |  |  |
Possible extension period |  | 2 years |  |  |  |
Ohio | Customary Advisory Council |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Term of proposed purchase power agreement |  |  |  |  |  | 8 years
Annual contribution amount |  |  |  |  |  | $ 1.0
Contribution amount |  |  |  |  |  | $ 8.0
Ohio | Energy Conservation, Economic Development and Job Retention | Ohio Companies |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Term of proposed purchase power agreement |  |  |  |  |  | 8 years
Annual contribution amount |  |  |  |  |  | $ 3.0
Contribution amount |  |  |  |  |  | $ 24.0
Ohio | Fuel-Fund | Ohio Companies |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Term of proposed purchase power agreement |  |  |  |  |  | 8 years
Annual contribution amount |  |  |  |  |  | $ 2.4
Contribution amount |  |  |  |  |  | $ 19.0

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