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Acquisitions, Discontinued Operations and Dispositions - Gen On and GenMA Settlement (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 16, 2018
Apr. 27, 2018
Dec. 31, 2017
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Pension liability         $ 76.0  
Liability, other postretirement-employment and retiree heal and welfare benefits         25.0  
GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Settlement consideration $ 261.0       $ 261.3  
Professional fees   $ 6.0        
GenOn Entities | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Credit applied           $ 28.0
Shared services, annualized rate     $ 84.0     84.0
GenOn Entities | Assignment Of Historical Claims Against REMA            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due 8.0          
GenOn Entities | Reduction Of Settlement Payment            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due 4.2          
GenOn Entities | Indemnification Of Potential Claims By REMA (up to)            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due 10.0          
Plan of Reorganization            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Percentage of aggregate principal amount         93.00%  
Payment of pension contributions     13.0     13.0
Plan of Reorganization | GenOn Mid-Atlantic | Intercompany Credit Agreement | Letter of Credit            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Letters of credit   $ 37.5        
Plan of Reorganization | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Credit applied           28.0
Payment to affiliate         $ 18.0  
Shared services, annualized rate     84.0     $ 84.0
Plan of Reorganization | Services Agreement | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payment to affiliate 15.0   $ 15.0 $ 13.5    
Plan of Reorganization | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payments to affiliate, settlement agreement 125.0          
Plan of Reorganization | GenOn Entities | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Credit applied 28.0          
Remaining payments and other balances due 10.0          
Plan of Reorganization | GenOn Entities | Revolving Credit Facility Borrowings            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Intercompany secured revolving credit facility and accrued interest and fees 151.0          
Plan of Reorganization | GenOn Entities | Accrued Interest On Borrowings            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Intercompany secured revolving credit facility and accrued interest and fees 12.0          
Plan of Reorganization | GenOn Entities | Other            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due $ 6.0