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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Loss The following table sets forth the after-tax components of comprehensive 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 |  | Available-For-Sale Securities |  | Total Accumulated Other Comprehensive Loss
| (Dollars in millions)
December 31, 2013 | $ | (70.5 | ) |  | $ | (205.8 | ) |  | $ | 12.0 |  |  | $ | (155.7 | ) |  | $ | 0.8 |  |  | $ | (419.2 | )
Net change in fair value | — |  |  | — |  |  | — |  |  | (195.0 | ) |  | (3.7 | ) |  | (198.7 | )
Reclassification from other comprehensive income to earnings | — |  |  | 31.0 |  |  | 1.7 |  |  | (10.2 | ) |  | 2.9 |  |  | 25.4 |
Current period change | (41.0 | ) |  | (142.7 | ) |  | 11.4 |  |  | — |  |  | — |  |  | (172.3 | )
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 | )
Net change in fair value | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
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 | )
The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive loss" into earnings during the years ended December 31, 2016 and 2015:
|  | Amount reclassified from accumulated other comprehensive loss (1) |  |
|  | Year Ended December 31 |  |
Details about accumulated other comprehensive loss components |  | 2016 |  | 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 |  | $ | (20.4 | ) |  | $ | (24.9 | ) |  | Operating costs and expenses
Defined benefit pension plans |  | (20.5 | ) |  | (32.9 | ) |  | Operating costs and expenses
Defined benefit pension plans |  | (4.2 | ) |  | (6.7 | ) |  | Selling and administrative expenses
Workers' compensation amortization |  | 11.7 |  |  | 8.0 |  |  | Operating costs and expenses
|  | (33.4 | ) |  | (56.5 | ) |  | Total before income taxes
|  | 12.4 |  |  | 20.9 |  |  | Income tax benefit
|  | $ | (21.0 | ) |  | $ | (35.6 | ) |  | Total after income taxes
Prior service credit (cost) associated with postretirement plans: |  |  |  |  |  |
Postretirement health care and life insurance benefits |  | $ | 9.2 |  |  | $ | 6.8 |  |  | Operating costs and expenses
Defined benefit pension plans |  | (0.3 | ) |  | (1.0 | ) |  | Operating costs and expenses
|  | 8.9 |  |  | 5.8 |  |  | Total before income taxes
|  | (3.3 | ) |  | (2.1 | ) |  | Income tax benefit
|  | $ | 5.6 |  |  | $ | 3.7 |  |  | Total after income taxes
Cash flow hedges: |  |  |  |  |  |
Foreign currency forward contracts |  | $ | (145.6 | ) |  | $ | (316.4 | ) |  | Operating costs and expenses
Fuel and explosives commodity swaps |  | (86.1 | ) |  | (120.4 | ) |  | Operating costs and expenses
Coal trading commodity futures, swaps and options |  | — |  |  | 51.8 |  |  | Other revenues
Insignificant items |  | (0.5 | ) |  | (0.7 | ) |  |
|  | (232.2 | ) |  | (385.7 | ) |  | Total before income taxes
|  | 85.9 |  |  | 134.0 |  |  | Income tax provision
|  | $ | (146.3 | ) |  | $ | (251.7 | ) |  | Total after income taxes
(1) Presented as gains (losses) in the consolidated statements of operations. Comprehensive loss differs from net loss by the amount of unrealized gain or loss resulting from valuation changes of the Company’s cash flow hedges (see Note 8. "Derivatives and Fair Value Measurements" and Note 9. "Coal Trading" for information related to the Company’s cash flow hedges), changes in the fair value of available-for-sale securities (see Note 7. "Investments" for information related to the Company's investments in available-for-sale securities), the change in actuarial loss and prior service cost of postretirement plans and workers' compensation obligations (see Note 17. "Postretirement Health Care and Life Insurance Benefits," Note 18. "Pension and Savings Plans" and Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation" 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 are 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 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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