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Asset Impairment and Mine Closure Costs (Tables) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Asset Impairment and Mine Closure Costs [Abstract] |  |  |
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] | The following costs are reflected in "Asset impairment" in the consolidated statement of operations for the year ended December 31, 2016:
|  | Reportable Segment |  |
|  | Australian Metallurgical Mining |  | Corporate and Other |  | Consolidated
|  | (Dollars in millions)
Asset impairment charges |  | $ | 193.2 |  |  | $ | 54.7 |  |  | $ | 247.9 |
| The following costs are reflected in "Asset impairment" in the consolidated statement of operations for the year ended December 31, 2015:
|  | Reportable Segment |  |
|  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Midwestern U.S. Mining |  | Corporate and Other |  | Consolidated
|  | (Dollars in millions)
Asset impairment charges: |  |  |  |  |  |  |  |  |  |
Long-lived assets |  | $ | 675.2 |  |  | $ | 17.5 |  |  | $ | 40.2 |  |  | $ | 268.4 |  |  | $ | 1,001.3 |
Equity method investment |  | — |  |  | — |  |  | — |  |  | 276.5 |  |  | 276.5 |
Total |  | $ | 675.2 |  |  | $ | 17.5 |  |  | $ | 40.2 |  |  | $ | 544.9 |  |  | $ | 1,277.8 |
| The following costs are reflected in "Asset impairment" in the consolidated statement of operations for the year ended December 31, 2014:
|  | Reportable Segment |  |
|  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Western U.S. Mining |  | Corporate and Other |  | Consolidated
|  | (Dollars in millions)
Asset impairment charges: |  |  |  |  |  |  |  |  |  |
Long-lived assets |  | $ | 66.7 |  |  | $ | 11.9 |  |  | $ | 2.7 |  |  | $ | 68.4 |  |  | $ | 149.7 |
Marketable securities |  | — |  |  | — |  |  | — |  |  | 4.7 |  |  | 4.7 |
Total |  | $ | 66.7 |  |  | $ | 11.9 |  |  | $ | 2.7 |  |  | $ | 73.1 |  |  | $ | 154.4 |

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- Definition Asset Impairment and Mine Closure Costs [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
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