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Derivatives and Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Classification and amounts of pre-tax gains and losses related to the Company's non coal-trading hedges | The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives:
|  |  |  | Successor
|  |  |  | Three Months Ended March 31, 2018
Financial Instrument |  | Income Statement Classification of Losses |  | Total loss recognized in income |  | Loss realized in income on derivatives |  | Unrealized loss recognized in income on non-designated derivatives
|  |  | (Dollars in millions)
Foreign currency option contracts |  | Operating costs and expenses |  | $ | (4.2 | ) |  | $ | (2.4 | ) |  | $ | (1.8 | )
Total |  |  |  | $ | (4.2 | ) |  | $ | (2.4 | ) |  | $ | (1.8 | )
|  |  |  | Predecessor
|  |  |  | Three Months Ended March 31, 2017
Financial Instrument |  | Income Statement Classification of Losses |  | Total loss recognized in income |  | Loss reclassified from other comprehensive loss into income
|  |  | (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 | )
Fair Value, Assets 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:
| March 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency contracts | $ | — |  |  | $ | 2.3 |  |  | $ | — |  |  | $ | 2.3 |
Total net financial assets | $ | — |  |  | $ | 2.3 |  |  | $ | — |  |  | $ | 2.3 |
| December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Foreign currency contracts | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 4.2 |
Total net financial assets | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 4.2 |
Carrying amounts and estimated fair values of the Company's debt | The carrying amounts and estimated fair values of the Company’s current and long-term debt as of March 31, 2018 and December 31, 2017 are summarized as follows:
| March 31, 2018 |  | December 31, 2017
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
| (Dollars in millions)
Current and Long-term debt | $ | 1,455.2 |  |  | $ | 1,535.6 |  |  | $ | 1,460.8 |  |  | $ | 1,547.4 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -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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