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Asset Impairment and Mine Closure Costs (Tables)

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Impaired Long-Lived Assets Held and Used [Line Items]

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

X

- 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=51719941&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section CC
-Subsection 3

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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