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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 |  |  |  |  |

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