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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
After-tax components of comprehensive income (loss) | The following table sets forth the after-tax components of accumulated other comprehensive income and changes thereto recorded during the three months ended March 31, 2018:
|  | Foreign Currency Translation Adjustment |  | Total Accumulated Other Comprehensive Income
|  | (Dollars in millions)
| December 31, 2017 | $ | 1.4 |  |  | $ | 1.4 |
| Current period change | (0.8 | ) |  | (0.8 | )
| March 31, 2018 | $ | 0.6 |  |  | $ | 0.6 |
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 period presented below:
|  | Amount reclassified from accumulated other comprehensive income (loss) (1) |  |
|  | Predecessor |  |
Details about accumulated other comprehensive income (loss) components |  | Three Months Ended March 31, 2017 |  | 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 |  | $ | (5.5 | ) |  | Net periodic benefit costs, excluding service cost
Defined benefit pension plans |  | (6.3 | ) |  | Net periodic benefit costs, excluding service cost
Insignificant items |  | 2.7 |  |  |
|  | (9.1 | ) |  | Total before income taxes
|  | 3.3 |  |  | Income tax benefit
|  | $ | (5.8 | ) |  | Total after income taxes
Prior service credit associated with postretirement plans: |  |  |  |
Postretirement health care and life insurance benefits |  | $ | 2.3 |  |  | Net periodic benefit costs, excluding service cost
Defined benefit pension plans |  | (0.1 | ) |  | Net periodic benefit costs, excluding service cost
|  | 2.2 |  |  | Total before income taxes
|  | (0.8 | ) |  | Income tax provision
|  | $ | 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 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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