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Discontinued Operations and Dispositions - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 27, 2018
Mar. 22, 2018
Jun. 12, 2017
Dec. 31, 2017
Dec. 31, 2017
Mar. 31, 2018
GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Pension liability           $ 91.0
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           $ 261.3
GenOn Entities | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Shared services, annualized rate       $ 84.0 $ 84.0  
Credit applied     $ 28.0      
Restructuring Support Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Percentage of aggregate principal amount           93.00%
Intercompany secured revolving credit facility           $ 125.0
Payment of pension contributions       13.0 13.0  
Restructuring Support Agreement | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Shared services, annualized rate       84.0 84.0  
Credit applied         $ 28.0  
Restructuring Support Agreement | Services Agreement | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Payment to affiliate   $ 13.5   $ 15.0    
Subsequent Event | GenOn Entities            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Professional fees $ 6.0          
Subsequent Event | Restructuring Support Agreement | 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