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Derivatives and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | The fair value of derivatives reflected in the accompanying balance sheets are set forth in the table below.
| December 31, 2018 |  | December 31, 2017
| Asset Derivative |  | Liability Derivative |  | Asset Derivative |  | Liability Derivative
| (Dollars in millions)
Foreign currency option contracts | $ | 1.2 |  |  | $ | — |  |  | $ | 4.2 |  |  | $ | — |
Coal contracts related to forecasted sales | 6.6 |  |  | (23.1 | ) |  | 8.4 |  |  | (46.1 | )
Coal trading contracts | 59.7 |  |  | (64.4 | ) |  | 119.4 |  |  | (126.7 | )
Total derivatives | 67.5 |  |  | (87.5 | ) |  | 132.0 |  |  | (172.8 | )
Effect of counterparty netting | (64.5 | ) |  | 64.5 |  |  | (125.2 | ) |  | 125.2 |
Variation margin posted | — |  |  | 21.8 |  |  | — |  |  | 35.8 |
Net derivatives and margin as classified in the balance sheets | $ | 3.0 |  |  | $ | (1.2 | ) |  | $ | 6.8 |  |  | $ | (11.8 | )
Derivative Instruments, Gain (Loss) | The tables below show the amounts of pre-tax gains and losses related to the Company’s derivatives.
|  | Successor
|  | Year Ended December 31, 2018
|  | Total (loss) gain recognized in income |  | (Loss) gain realized in income on derivatives |  | Unrealized (loss) gain recognized in income on derivatives
Financial Instrument |  |  |
|  | (Dollars in millions)
Foreign currency option contracts |  | $ | (9.1 | ) |  | $ | (8.4 | ) |  | $ | (0.7 | )
Coal contracts related to forecasted sales |  | 115.7 |  |  | 97.4 |  |  | 18.3 |
Coal trading contracts |  | (2.9 | ) |  | (5.3 | ) |  | 2.4 |
Total |  | $ | 103.7 |  |  | $ | 83.7 |  |  | $ | 20.0 |
|  | Successor
|  | April 2 through December 31, 2017
|  | Total gain (loss) recognized in income |  | Gain (loss) realized in income on derivatives |  | Unrealized (loss) gain recognized in income on derivatives
Financial Instrument |  |  |
|  | (Dollars in millions)
Foreign currency option contracts |  | $ | 1.8 |  |  | $ | 3.3 |  |  | $ | (1.5 | )
Coal contracts related to forecasted sales |  | 12.1 |  |  | 35.1 |  |  | (23.0 | )
Coal trading contracts |  | (1.6 | ) |  | (8.3 | ) |  | 6.7 |
Total |  | $ | 12.3 |  |  | $ | 30.1 |  |  | $ | (17.8 | )
|  | Predecessor
|  | January 1 through April 1, 2017
|  | Total (loss) gain recognized in income |  | Gain (loss) realized in income on derivatives |  | Unrealized gain recognized in income on derivatives |  | Loss reclassified from other comprehensive loss into income
Financial Instrument |  |
|  | (Dollars in millions)
Commodity swap contracts |  | $ | (11.0 | ) |  | $ | — |  |  | $ | — |  |  | $ | (11.0 | )
Foreign currency forward contracts |  | (16.6 | ) |  | — |  |  | — |  |  | (16.6 | )
Financial coal contracts - Company production |  | 29.2 |  |  | 12.7 |  |  | 16.5 |  |  | — |
Coal trading contracts |  | 2.2 |  |  | (11.3 | ) |  | 13.5 |  |  | — |
Total |  | $ | 3.8 |  |  | $ | 1.4 |  |  | $ | 30.0 |  |  | $ | (27.6 | )
|  | Predecessor
|  | Year Ended December 31, 2016
Financial Instrument |  | Total realized (loss) gain recognized in income |  | Gain realized in income on derivatives |  | Unrealized loss recognized in income on derivatives |  | Loss reclassified from other comprehensive income into income (effective portion) |  | Loss reclassified from other comprehensive income into income (ineffective portion)
|  | (Dollars in millions)
Commodity swap contracts |  | $ | (136.8 | ) |  | $ | — |  |  | $ | — |  |  | $ | (86.1 | ) |  | $ | (50.7 | )
Foreign currency forward contracts |  | (179.3 | ) |  | — |  |  | — |  |  | (145.6 | ) |  | (33.7 | )
Coal contracts related to forecasted sales |  | 5.6 |  |  | 45.4 |  |  | (39.8 | ) |  | — |  |  | — |
Coal trading contracts |  | (16.5 | ) |  | 22.1 |  |  | (38.6 | ) |  | — |  |  | — |
Total |  | $ | (327.0 | ) |  | $ | 67.5 |  |  | $ | (78.4 | ) |  | $ | (231.7 | ) |  | $ | (84.4 | )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables set forth the hierarchy of the Company’s net financial asset (liability) positions for which fair value is measured on a recurring basis:
| December 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency option contracts | $ | — |  |  | $ | 1.2 |  |  | $ | — |  |  | $ | 1.2 |
Coal contracts related to forecasted sales | — |  |  | (21.2 | ) |  | — |  |  | (21.2 | )
Coal trading contracts | — |  |  | 21.8 |  |  | — |  |  | 21.8 |
Equity securities | — |  |  | — |  |  | 10.0 |  |  | 10.0 |
Total net financial assets | $ | — |  |  | $ | 1.8 |  |  | $ | 10.0 |  |  | $ | 11.8 |
| December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency option contracts | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 4.2 |
Coal contracts related to forecasted sales | — |  |  | (40.2 | ) |  | — |  |  | (40.2 | )
Coal trading contracts | (3.0 | ) |  | 34.0 |  |  | — |  |  | 31.0 |
Total net financial liabilities | $ | (3.0 | ) |  | $ | (2.0 | ) |  | $ | — |  |  | $ | (5.0 | )
Carrying Amounts And Estimated Fair Values Of Company's Debt | The carrying amount and estimated fair values of the Company’s current and long-term debt as of December 31, 2018 and 2017 are summarized as follows:
| December 31, 2018 |  | December 31, 2017
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
| (Dollars in millions)
Current and Long-term debt | $ | 1,367.0 |  |  | $ | 1,366.2 |  |  | $ | 1,460.8 |  |  | $ | 1,547.4 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The following table summarizes the changes in the Company’s recurring Level 3 net financial assets (liabilities):
| Successor | Predecessor
| Year Ended December 31, 2018 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016
| (Dollars in millions)
Beginning of period | $ | — |  |  | $ | (0.7 | ) | $ | (1.1 | ) |  | $ | (15.6 | )
Transfers into Level 3 | — |  |  | — |  | — |  |  | 5.3 |
Transfers out of Level 3 | — |  |  | 0.7 |  | 0.2 |  |  | (0.4 | )
Total gains realized/unrealized: |  |  |  |  |  |
Included in earnings | (1.7 | ) |  | — |  | 0.2 |  |  | (2.4 | )
Purchases | 10.0 |  |  | — |  | — |  |  | — |
Sales | — |  |  | — |  | — |  |  | — |
Settlements | 1.7 |  |  | — |  | — |  |  | 12.0 |
End of period | $ | 10.0 |  |  | $ | — |  | $ | (0.7 | ) |  | $ | (1.1 | )
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] | The following table summarizes the changes in net unrealized gains relating to Level 3 net financial liabilities held both as of the beginning and the end of the period:
| Successor | Predecessor
| Year Ended December 31, 2018 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016
| (Dollars in millions)
Changes in unrealized gains (1) | $ | — |  |  | $ | — |  | $ | 0.3 |  |  | $ | — |
(1) | Within the consolidated statements of operations and consolidated statements of comprehensive income for the periods presented, unrealized gains from Level 3 items are combined with unrealized gains and losses on positions classified in Level 1 or 2, as well as other positions that have been realized during the applicable periods.

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period 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 asset. + References Reference 1: 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 Reference 2: 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 + 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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