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Acquisitions, Discontinued Operations and Dispositions - GenOn Settlement and Plan Confirmation (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 16, 2018
Apr. 27, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Collateral posted       $ 26.0 $ 125.0 $ 0.0
GenOn Mid-Atlantic | Restructuring Support Agreement | Letter of Credit | Intercompany Credit Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Letters of credit facility   $ 37.5        
Services Agreement | GenOn | Restructuring Support Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Collateral posted $ 15.0          
GenOn            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Settlement consideration 261.0          
Deduction for GenOn tax losses       $ 9,500.0    
Professional fees   $ 6.0        
GenOn | Restructuring Support Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Settlement consideration 125.0          
GenOn | Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Credit applied     $ 28.0      
GenOn | Services Agreement | Restructuring Support 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 under settlement agreement 10.0          
GenOn | Revolving Credit Facility Borrowings | Restructuring Support Agreement            
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          
GenOn | Accrued Interest On Borrowings | Restructuring Support Agreement            
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          
GenOn | Other | Restructuring Support Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Remaining payments and other balances due under settlement agreement 2.0          
GenOn | 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 under settlement agreement 8.0          
GenOn | 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 under settlement agreement $ 4.0