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Acquisitions, Discontinued Operations and Dispositions - GenOn and GenMA Settlement (Details) - USD ($) $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Jul. 16, 2018 | Apr. 27, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Return of collateral posted to NRG |  |  | $ 0.0 | $ 26.0
GenOn | Services Agreement | Restructuring Support Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Return of collateral posted to NRG | $ 15.0 |  |  |
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, new credit support |  | $ 37.5 |  |
Affiliated Entity |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Settlement consideration | 261.0 |  |  |
Professional fees |  | $ 6.0 |  |
Affiliated Entity | Restructuring Support Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Settlement agreement, payment | 125.0 |  |  |
Affiliated Entity | Services Agreement | Restructuring Support Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Transition services credit | 28.0 |  |  |
Related Party Transaction, Due from (to) Related Party | 10.0 |  |  |
Affiliated Entity | Revolving Credit Facility Borrowings | Restructuring Support Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Borrowings under intercompany agreement | 151.0 |  |  |
Affiliated Entity | Accrued Interest On Borrowings | Restructuring Support Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Borrowings under intercompany agreement | 12.0 |  |  |
Affiliated Entity | Reduction Of Settlement Payment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Related Party Transaction, Due from (to) Related Party | 4.0 |  |  |
Affiliated Entity | Assignment Of Historical Claims Against REMA |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Related Party Transaction, Due from (to) Related Party | 8.0 |  |  |
Affiliated Entity | Other | Restructuring Support Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Related Party Transaction, Due from (to) Related Party | $ 2.0 |  |  |

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