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Commitments and Contingencies (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2016
Jan. 19, 2016
Aug. 31, 2016
Feb. 29, 2016
May 31, 2015
Sep. 30, 2016
Dec. 31, 2015
Indirect Tax Audits              
Loss Contingencies [Line Items]              
Loss during the period           $ 1.6  
Increase in liabilities from accrual of additional loss           1.9  
Provider Companies | Pending Litigation | Halifax-American Energy Company, LLC et al v. Provider Power, LLC, Electricity N.H., LLC, Electricity Maine, LLC, Emile Clavet and Kevin Dean              
Loss Contingencies [Line Items]              
Litigation settlement amount   $ (0.6)          
Attorney fees   $ 0.3          
Appeal bond $ 1.0            
Contingent liabilities           $ 1.0  
Major Energy Companies | Settled Litigation | Misleading Marketing Practices- Illinois Commerce Commission              
Loss Contingencies [Line Items]              
Litigation settlement amount         $ (0.3)    
Major Energy Companies | Settled Litigation | Misleading Marketing Practices- Maryland Public Service Commission              
Loss Contingencies [Line Items]              
Litigation settlement amount       $ (0.3)     $ (0.3)
Major Energy Companies | Settled Litigation | Misleading Marketing Practices- Pennsylvania Public Utility Commission/Bureau of Investigation and Enforcement              
Loss Contingencies [Line Items]              
Litigation settlement amount     $ (4.1)