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Discontinued Operations Textuals (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2007
Successor |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  |  |  | $ 0 | $ 0 |  |  |
Patriot Bankruptcy Liability | $ 102,700,000 | $ 134,000,000 |  |  | 134,000,000 | 102,700,000 |  |  |
Net mark-to-market adjustment on actuarially determined liabilities | 125,500,000 | 45,200,000 |  |  | (45,200,000) | (125,500,000) |  |  |
Amount contributed to the Combined Benefit Fund |  |  |  |  | 1,700,000 | 2,200,000 |  |  |
Combined Benefit Fund Lower Estimate |  |  |  |  |  | 1,000,000 |  |  |
Combined Benefit Fund Future Estimate |  |  |  |  |  | 2,000,000 |  |  |
Combined Benefit Fund Liability | $ 16,400,000 | $ 20,200,000 |  |  | 20,200,000 | 16,400,000 |  |  |
Income (loss) from discontinued operations, net of income taxes |  |  |  |  | (19,800,000) | 18,100,000 |  |  |
Successor | Combined benefit fund |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss from discontinued operations before income taxes |  |  |  |  | 600,000 | 700,000 |  |  |
Successor | Patriot Coal Corporation |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net mark-to-market adjustment on actuarially determined liabilities |  |  |  |  | 7,900,000 | 33,700,000 |  |  |
Successor | United Mine Workers of America |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of income taxes |  |  |  |  | $ 46,000,000 | $ 36,700,000 |  |  |
Predecessor |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  | $ 0 |  |  |  | $ 0 |  |
Potential exposure from Patriot bankruptcy |  |  |  |  |  |  |  |  | $ 150,000,000
Net mark-to-market adjustment on actuarially determined liabilities |  |  | 0 |  |  |  | 0 |  |
Estimated fund obligation |  |  |  |  |  |  |  |  | $ 40,000,000
Amount contributed to the Combined Benefit Fund |  |  | 600,000 |  |  |  |  |  |
Payment to the VEBA based on the construct of the negotiated settlement |  |  |  |  |  |  |  | $ 75,000,000 |
Income (loss) from discontinued operations, net of income taxes |  |  | (16,200,000) |  |  |  | (57,600,000) |  |
Predecessor | Combined benefit fund |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss from discontinued operations before income taxes |  |  | $ 200,000 |  |  |  | $ 1,200,000 |  |
Predecessor | United Mine Workers of America |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of income taxes |  |  |  | $ 54,300,000 |  |  |  |  |

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