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Accumulated Other Comprehensive Income (Loss) | 6 Months Ended
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Jun. 30, 2017
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other 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 |
The components of accumulated other comprehensive income (loss) related to postretirement plans and workers' compensation obligations and cash flow hedges related to Predecessor periods were eliminated in accordance with fresh start reporting as described in Note 3. “Emergence from the Chapter 11 Cases and Fresh Start Reporting." 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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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