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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2017
Equity [Abstract] |
After-tax components of comprehensive income (loss) | The following table sets forth the after-tax components of accumulated other comprehensive income (loss) and changes thereto recorded during the Predecessor period January 1 through April 1, 2017 and the Successor period April 2 through June 30, 2017:
|  | Foreign Currency Translation Adjustment |  | Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations |  | Prior Service Cost Associated with Postretirement Plans |  | Cash Flow Hedges |  | Total Accumulated Other Comprehensive (Loss) Income
|  | (Dollars in millions)
Predecessor Company |  |  |  |  |  |  |  |  |
| 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 | 0.5 |  |  | — |  |  | — |  |  | — |  |  | 0.5 |
| June 30, 2017 | $ | 0.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.5 |
Reclassification out of accumulated other comprehensive income (loss) | The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive income (loss)" into earnings during the Predecessor periods January 1 through April 1, 2017 and the three and six months ended June 30, 2016:
|  | Amount reclassified from accumulated other comprehensive income (loss) (1) |  |
|  | Predecessor |  |
Details about accumulated other comprehensive income (loss) components |  | Three Months Ended June 30, 2016 | January 1 through April 1, 2017 | Six Months Ended June 30, 2016 |  | Affected line item in the unaudited condensed 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 |  | $ | (5.1 | ) | $ | (5.5 | ) | $ | (10.2 | ) |  | Operating costs and expenses
Defined benefit pension plans |  | (5.1 | ) | (5.3 | ) | (10.2 | ) |  | Operating costs and expenses
Defined benefit pension plans |  | (1.1 | ) | (1.0 | ) | (2.1 | ) |  | Selling and administrative expenses
Insignificant items |  | 2.9 |  | 2.7 |  | 5.8 |  |  |
|  | (8.4 | ) | (9.1 | ) | (16.7 | ) |  | Total before income taxes
|  | 3.1 |  | 3.3 |  | 6.2 |  |  | Income tax benefit
|  | $ | (5.3 | ) | $ | (5.8 | ) | $ | (10.5 | ) |  | Total after income taxes
Prior service credit associated with postretirement plans: |  |  |  |  |  |
Postretirement health care and life insurance benefits |  | $ | 2.8 |  | $ | 2.3 |  | $ | 5.5 |  |  | Operating costs and expenses
Defined benefit pension plans |  | (0.1 | ) | (0.1 | ) | (0.2 | ) |  | Operating costs and expenses
|  | 2.7 |  | 2.2 |  | 5.3 |  |  | Total before income taxes
|  | (1.0 | ) | (0.8 | ) | (2.0 | ) |  | Income tax provision
|  | $ | 1.7 |  | $ | 1.4 |  | $ | 3.3 |  |  | Total after income taxes
Cash flow hedges: |  |  |  |  |  |
Foreign currency cash flow hedge contracts |  | $ | (40.2 | ) | $ | (16.6 | ) | $ | (94.1 | ) |  | Operating costs and expenses
Fuel and explosives commodity swaps |  | (22.2 | ) | (11.0 | ) | (47.0 | ) |  | Operating costs and expenses
Insignificant items |  | (0.1 | ) | (0.1 | ) | (0.3 | ) |  |
|  | (62.5 | ) | (27.7 | ) | (141.4 | ) |  | Total before income taxes
|  | 23.1 |  | 9.1 |  | 52.3 |  |  | Income tax benefit
|  | $ | (39.4 | ) | $ | (18.6 | ) | $ | (89.1 | ) |  | Total after income taxes
(1) | Presented as gains (losses) in the unaudited condensed 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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