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Derivatives and Fair Value Measurements (Tables) - Non Coal Trading [Member] | 12 Months Ended
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Dec. 31, 2017
Derivative [Line Items] |
Derivative Instruments, Gain (Loss) | The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives during the period April 2 through December 31, 2017, January 1 through April 1, 2017 and the years ended December 31, 2016 and 2015:
|  |  |  | Successor
|  |  |  | April 2 through December 31, 2017
|  | Income Statement Classification |  | Total gain recognized in income |  | Gain realized in income on derivatives |  | Unrealized loss recognized in income on derivatives
Financial Instrument |  |  |  |
|  |  |  | (Dollars in millions)
Foreign currency option contracts |  | Operating costs and expenses |  | $ | 1.8 |  |  | $ | 3.3 |  |  | $ | (1.5 | )
Total |  |  |  | $ | 1.8 |  |  | $ | 3.3 |  |  | $ | (1.5 | )
|  |  |  | Predecessor
|  |  |  | January 1 through April 1, 2017
|  | Income Statement Classification |  | Total loss recognized in income |  | Loss reclassified from other comprehensive loss into income
Financial Instrument |  |  |
|  |  |  | (Dollars in millions)
Commodity swap contracts |  | Operating costs and expenses |  | $ | (11.0 | ) |  | $ | (11.0 | )
Foreign currency forward contracts |  | Operating costs and expenses |  | (16.6 | ) |  | (16.6 | )
Total |  |  |  | $ | (27.6 | ) |  | $ | (27.6 | )
|  |  |  | Predecessor
|  |  |  | Year Ended December 31, 2016
|  | Income Statement Classification |  | Total realized loss recognized in income |  | Loss reclassified from other comprehensive income into income (effective portion) (1) |  | (Loss) gain reclassified from other comprehensive income into income (ineffective portion)
Financial Instrument |  |  |  |
|  |  |  | (Dollars in millions)
Commodity swap contracts |  | Operating costs and expenses |  | $ | (98.0 | ) |  | $ | (86.1 | ) |  | $ | (11.9 | )
Commodity swap contracts |  | Reorganization items, net |  | (38.8 | ) |  | — |  |  | (38.8 | )
Foreign currency forward contracts |  | Operating costs and expenses |  | (142.9 | ) |  | (145.6 | ) |  | 2.7 |
Foreign currency forward contracts |  | Reorganization items, net |  | (36.4 | ) |  | — |  |  | (36.4 | )
Total |  |  |  | $ | (316.1 | ) |  | $ | (231.7 | ) |  | $ | (84.4 | )
(1) | Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $13.6 million and $9.0 million of previously unrecognized losses on foreign currency and fuel contracts, respectively, monetized in the first quarter of 2016.
|  |  |  | Predecessor
|  |  |  | Year Ended December 31, 2015
|  | Income Statement Classification |  | Loss recognized in other comprehensive income on derivative (effective portion) |  | Loss reclassified from other comprehensive income into income (effective portion) (1) |  | Gain reclassified from other comprehensive income into income (ineffective portion)
Financial Instrument |  |  |  |
|  |  |  | (Dollars in millions)
Commodity swap contracts |  | Operating costs and expenses |  | $ | (77.0 | ) |  | $ | (122.0 | ) |  | $ | 1.6 |
Foreign currency forward contracts |  | Operating costs and expenses |  | (122.0 | ) |  | (316.4 | ) |  | — |
Total |  |  |  | $ | (199.0 | ) |  | $ | (438.4 | ) |  | $ | 1.6 |
(1) | Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $14.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following tables set forth the hierarchy of the Company’s net financial asset positions for which fair value is measured on a recurring basis:
| Successor
| December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency option contracts | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 4.2 |
Total net financial assets | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 4.2 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The following table summarizes the changes related to the Company’s Corporate Hedging derivative financial instruments recurring Level 3 financial liabilities:
|  | Predecessor
|  | December 31, 2016
|  | Commodity Contracts |  | Foreign Currency Contracts |  | Total
| (Dollars in millions)
Beginning of period |  | $ | 123.7 |  |  | $ | 200.7 |  |  | $ | 324.4 |
Total net losses realized/unrealized: |  |  |  |  |  |
Included in earnings |  | 15.7 |  |  | (48.0 | ) |  | (32.3 | )
Settlements / terminations |  | (139.4 | ) |  | (152.7 | ) |  | (292.1 | )
End of period |  | $ | — |  |  | $ | — |  |  | $ | — |
Carrying Amounts And Estimated Fair Values Of Companys Debt [Table Text Block] | The carrying amount and estimated fair value of the Company’s current and long-term debt as of December 31, 2017 are summarized as follows:
| Successor
| December 31, 2017
| Carrying Amount |  | Estimated Fair Value
| (Dollars in millions)
Current and Long-term debt | $ | 1,460.8 |  |  | $ | 1,547.4 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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