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Related Party Transactions - Service Agreement and Transition Service Agreement with GeOn (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 14, 2017 | Jun. 12, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other income - affiliate |  |  | $ 84.0 |  | $ 87.0 | $ 193.0 | $ 193.0
Services Agreement | GenOn |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Service fees |  |  |  |  | 193.0 |  |
Reserve against affiliate receivable |  |  | 12.0 | $ 12.0 | 12.0 |  |
Services Agreement | Restructuring Support Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shared services annualized rate |  | $ 84.0 | 84.0 | 84.0 | 84.0 |  |
Monthly cost of shared services | $ 5.0 |  | 7.0 | $ 5.0 |  |  |
Credit applied |  | $ 28.0 | 3.5 |  | 28.0 |  |
Transition Services Agreement | Restructuring Support Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Credit applied |  |  | $ 28.0 |  |  |  |
Transition Services Agreement | Restructuring Support Agreement | GenOn |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other income - affiliate |  |  |  |  | 87.0 |  |
Shared service, selling, general and administrative |  |  |  |  | $ 42.0 |  |

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