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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
After-tax components of comprehensive income (loss) | The following table sets forth the after-tax components of comprehensive income (loss):
| Foreign Currency Translation Adjustment |  | Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations |  | Prior Service Credit (Cost) Associated with Postretirement Plans |  | Cash Flow Hedges |  | Total Accumulated Other Comprehensive Income (Loss)
| (Dollars in millions)
Predecessor Company |  |  |  |  |  |  |  |  |
December 31, 2014 | $ | (111.5 | ) |  | $ | (317.5 | ) |  | $ | 25.1 |  |  | $ | (360.9 | ) |  | $ | (764.8 | )
Net change in fair value | — |  |  | — |  |  | — |  |  | (131.3 | ) |  | (131.3 | )
Reclassification from other comprehensive income to earnings | — |  |  | 35.6 |  |  | (3.7 | ) |  | 251.7 |  |  | 283.6 |
Current period change | (34.9 | ) |  | 18.1 |  |  | 10.4 |  |  | — |  |  | (6.4 | )
December 31, 2015 | (146.4 | ) |  | (263.8 | ) |  | 31.8 |  |  | (240.5 | ) |  | (618.9 | )
Reclassification from other comprehensive income to earnings | — |  |  | 21.0 |  |  | (5.6 | ) |  | 146.3 |  |  | 161.7 |
Current period change | (1.8 | ) |  | (13.5 | ) |  | (4.5 | ) |  | — |  |  | (19.8 | )
December 31, 2016 | (148.2 | ) |  | (256.3 | ) |  | 21.7 |  |  | (94.2 | ) |  | (477.0 | )
Reclassification from other comprehensive income to earnings | — |  |  | 5.8 |  |  | (1.4 | ) |  | 18.6 |  |  | 23.0 |
Current period change | 5.5 |  |  | — |  |  | — |  |  | — |  |  | 5.5 |
Fresh start reporting adjustment | 142.7 |  |  | 250.5 |  |  | (20.3 | ) |  | 75.6 |  |  | 448.5 |
April 1, 2017 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Successor Company |  |  |  |  |  |  |  |  |
Current period change | 1.4 |  |  | — |  |  | — |  |  | — |  |  | 1.4 |
December 31, 2017 | $ | 1.4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.4 |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following table provides additional information regarding items reclassified out of “Accumulated other comprehensive income (loss)” into earnings during the periods presented below:
|  | Amount reclassified from accumulated other comprehensive income (loss) (1) |  |
|  | Predecessor |  |
Details about accumulated other comprehensive loss components |  | January 1 through April 1, 2017 | Year Ended December 31, 2016 | Year Ended December 31, 2015 |  | Affected line item in the consolidated statement of operations
| (Dollars in millions) |  |
Net actuarial loss associated with postretirement plans and workers’ compensation obligations: |  |  |  |  |  |
Postretirement health care and life insurance benefits |  | $ | (5.5 | ) | $ | (20.4 | ) | $ | (24.9 | ) |  | Operating costs and expenses
Defined benefit pension plans |  | (5.3 | ) | (20.5 | ) | (32.9 | ) |  | Operating costs and expenses
Defined benefit pension plans |  | (1.0 | ) | (4.2 | ) | (6.7 | ) |  | Selling and administrative expenses
Workers’ compensation amortization |  | 2.7 |  | 11.7 |  | 8.0 |  |  | Operating costs and expenses
|  | (9.1 | ) | (33.4 | ) | (56.5 | ) |  | Total before income taxes
|  | 3.3 |  | 12.4 |  | 20.9 |  |  | Income tax benefit
|  | $ | (5.8 | ) | $ | (21.0 | ) | $ | (35.6 | ) |  | Total after income taxes
Prior service credit (cost) associated with postretirement plans: |  |  |  |  |  |
Postretirement health care and life insurance benefits |  | $ | 2.3 |  | $ | 9.2 |  | $ | 6.8 |  |  | Operating costs and expenses
Defined benefit pension plans |  | (0.1 | ) | (0.3 | ) | (1.0 | ) |  | Operating costs and expenses
|  | 2.2 |  | 8.9 |  | 5.8 |  |  | Total before income taxes
|  | (0.8 | ) | (3.3 | ) | (2.1 | ) |  | Income tax provision
|  | $ | 1.4 |  | $ | 5.6 |  | $ | 3.7 |  |  | Total after income taxes
Cash flow hedges: |  |  |  |  |  |
Foreign currency cash flow contracts |  | $ | (16.6 | ) | $ | (145.6 | ) | $ | (316.4 | ) |  | Operating costs and expenses
Fuel and explosives commodity swaps |  | (11.0 | ) | (86.1 | ) | (120.4 | ) |  | Operating costs and expenses
Coal trading commodity futures, swaps and options |  | — |  | — |  | 51.8 |  |  | Other revenues
Insignificant items |  | (0.1 | ) | (0.5 | ) | (0.7 | ) |  |
|  | (27.7 | ) | (232.2 | ) | (385.7 | ) |  | Total before income taxes
|  | 9.1 |  | 85.9 |  | 134.0 |  |  | Income tax benefit
|  | $ | (18.6 | ) | $ | (146.3 | ) | $ | (251.7 | ) |  | Total after income taxes
(1) Presented as gains (losses) in the consolidated statements of operations.

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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