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Accumulated Other Comprehensive Income (Loss) (Notes) | 12 Months Ended
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Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other 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 |
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 2. “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 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. Comprehensive loss for the Predecessor periods differed from net loss by the amount of unrealized gain or loss resulting from valuation changes of the Company’s cash flow hedges (see Note 7. “Derivatives and Fair Value Measurements” and Note 8. “Coal Trading” for information related to the Company’s cash flow hedges), the change in actuarial loss and prior service cost of postretirement plans and workers’ compensation obligations (see Note 16. “Postretirement Health Care and Life Insurance Benefits,” Note 17. “Pension and Savings Plans” and Note 4. “Discontinued Operations” for information related to the Company’s postretirement and pension plans) and foreign currency translation adjustment related to the Company’s investments in Middlemount, whose functional currency is the Australian dollar. The values of the Company’s cash flow hedging instruments were primarily affected by the U.S. dollar/Australian dollar exchange rate and changes in the prices of certain coal and diesel fuel products.

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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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