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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