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Discontinued Operations Textuals (Details) AUD in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2016 AUD | Oct. 31, 2007 USD ($)
Predecessor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Potential exposure from Patriot bankruptcy |  |  |  |  |  |  |  |  |  | $ 150.0
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net |  | $ 0.0 |  |  |  |  | $ 0.0 | $ 0.0 |  |
Estimated fund obligation |  |  |  |  |  |  |  |  |  | $ 40.0
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  | $ (16.2) |  |  |  |  | (57.6) | (182.2) |  |
Amount paid to the Combined Benefit Fund |  | 0.6 |  |  |  |  |  |  |  |
Combined Benefit Fund Lower Estimate |  |  |  |  |  | $ 2.0 |  |  |  |
Combined Benefit Fund Future Estimate |  |  |  |  |  | $ 3.0 |  |  |  |
Liability related to Combined Benefit Fund |  |  |  |  |  | 20.2 |  |  |  |
Payment to the VEBA based on the construct of the negotiated settlement |  |  |  |  |  |  |  | 75.0 |  |
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest |  | $ (16.2) | $ 13.1 | $ 38.1 |  |  | (57.6) | (175.0) |  |
Successor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Liability recorded related to Patriot Bankruptcy |  |  |  |  | 134.0 |  |  |  |  |
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net | $ 45.2 |  |  |  | $ (45.2) |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  | $ (19.8) |  |  |  |  |
Amount paid to the Combined Benefit Fund |  |  |  |  | 1.7 |  |  |  |  |
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest |  |  |  |  | $ (19.8) |  |  |  |  |
Wilkie Creek [Member] | Predecessor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  |  |  |  | 9.7 |  |
Settlement charges total |  |  |  | $ 9.9 |  |  |  |  | AUD 13.0 |
Combined benefit fund [Member] | Predecessor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  | $ 0.2 |  |  |  |  | $ 1.2 | $ 24.6 |  |
Combined benefit fund [Member] | Successor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  | 0.6 |  |  |  |  |
Patriot Coal Corporation [Member] | Successor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Mark-to-Market Adjustment on Pension and Postretirement Plans, Net |  |  |  |  | 7.9 |  |  |  |  |
United Mine Workers of America [Member] | Predecessor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest |  |  | $ 54.3 |  |  |  |  |  |  |
United Mine Workers of America [Member] | Successor |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest |  |  |  |  | $ 46.0 |  |  |  |  |

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