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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2019
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 accumulated other comprehensive (loss) income and changes thereto:
| 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 (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 | 1.4 |  |  | — |  |  | — |  |  | — |  |  | 1.4 |
December 31, 2017 | 1.4 |  |  | — |  |  | — |  |  | — |  |  | 1.4 |
Current period change | (5.9 | ) |  | — |  |  | 44.6 |  |  | — |  |  | 38.7 |
December 31, 2018 | (4.5 | ) |  | — |  |  | 44.6 |  |  | — |  |  | 40.1 |
Reclassification from other comprehensive income to earnings | — |  |  | — |  |  | (8.7 | ) |  | — |  |  | (8.7 | )
Current period change | 0.2 |  |  | — |  |  | — |  |  | — |  |  | 0.2 |
December 31, 2019 | $ | (4.3 | ) |  | $ | — |  |  | $ | 35.9 |  |  | $ | — |  |  | $ | 31.6 |
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” into earnings during the periods presented below:
|  | Amount reclassified from accumulated other comprehensive loss (1) |
|  | Successor | Predecessor |
Details about accumulated other comprehensive loss components |  | Year Ended December 31, 2019 | January 1 through April 1, 2017 |  | 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 | ) |  | Net periodic benefit costs, excluding service cost
Defined benefit pension plans |  | — |  | (6.3 | ) |  | Net periodic benefit costs, excluding service cost
Workers’ compensation amortization |  | — |  | 2.7 |  |  | Net periodic benefit costs, excluding service cost
|  | — |  | (9.1 | ) |  | Total before income taxes
|  | — |  | 3.3 |  |  | Income tax benefit
|  | $ | — |  | $ | (5.8 | ) |  | Total after income taxes
Prior service credit (cost) associated with postretirement plans: |  |  |  |  |
Postretirement health care and life insurance benefits |  | $ | 8.7 |  | $ | 2.3 |  |  | Net periodic benefit costs, excluding service cost
Defined benefit pension plans |  | — |  | (0.1 | ) |  | Net periodic benefit costs, excluding service cost
|  | 8.7 |  | 2.2 |  |  | Total before income taxes
|  | — |  | (0.8 | ) |  | Income tax provision
|  | $ | 8.7 |  | $ | 1.4 |  |  | Total after income taxes
Cash flow hedges: |  |  |  |  |
Foreign currency cash flow hedge contracts |  | $ | — |  | $ | (16.6 | ) |  | Operating costs and expenses
Fuel and explosives commodity swaps |  | — |  | (11.0 | ) |  | Operating costs and expenses
Insignificant items |  | — |  | (0.1 | ) |  |
|  | — |  | (27.7 | ) |  | Total before income taxes
|  | — |  | 9.1 |  |  | Income tax benefit
|  | $ | — |  | $ | (18.6 | ) |  | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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