Segment Information (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Operating segment results

Segment results for the year ended December 31, 2014 were as follows (assets as of December 31, 2014):

	Western U.S. Mining		Midwestern U.S. Mining		Australian Mining		Trading and Brokerage		Corporate and Other			Consolidated
	(Dollars in millions)
Revenues	$	2,825.7	$	1,198.1	$	2,671.8	$	58.4	$	38.2		$	6,792.2
Adjusted EBITDA	770.4		301.4		74.4		14.9		(347.1		)	814.0
Total assets	3,431.3		667.8		6,623.9		300.7		2,167.4			13,191.1
Property, plant, equipment and mine development, net	3,127.8		612.1		5,503.7		1.1		1,332.6			10,577.3
Additions to property, plant, equipment and mine development	37.9		57.4		84.1		—		15.0			194.4
Federal coal lease expenditures	276.7		—		—		—		—			276.7
Loss from equity affiliates	—		—		—		—		107.6			107.6

Segment results for the year ended December 31, 2013 were as follows (assets as of December 31, 2013):

	Western U.S. Mining		Midwestern U.S. Mining		Australian Mining		Trading and Brokerage			Corporate and Other			Consolidated
	(Dollars in millions)
Revenues	$	2,669.6	$	1,335.5	$	2,904.6	$	66.0		$	38.0		$	7,013.7
Adjusted EBITDA	698.3		428.3		316.6		(19.9		)	(376.1		)	1,047.2
Total assets	3,307.6		716.8		7,081.2		389.6			2,638.2			14,133.4
Property, plant, equipment and mine development, net	2,986.8		667.6		5,947.1		1.8			1,479.2			11,082.5
Additions to property, plant, equipment and mine development	48.0		27.2		230.3		0.1			22.8			328.4
Federal coal lease expenditures	276.8		—		—		—			—			276.8
Loss from equity affiliates	—		—		—		—			40.2			40.2

Segment results for the year ended December 31, 2012 were as follows (assets as of December 31, 2012):

	Western U.S. Mining		Midwestern U.S. Mining		Australian Mining		Trading and Brokerage		Corporate and Other			Consolidated
	(Dollars in millions)
Revenues	$	2,949.3	$	1,403.7	$	3,503.6	$	199.9	$	21.0		$	8,077.5
Adjusted EBITDA	832.8		427.0		938.9		119.7		(481.9		)	1,836.5
Total assets	3,257.9		728.5		7,990.8		543.9		3,287.9			15,809.0
Property, plant, equipment and mine development, net	2,896.1		707.5		6,595.5		1.6		1,601.0			11,801.7
Additions to property, plant, equipment and mine development	121.4		74.7		743.4		0.1		46.4			986.0
Federal coal lease expenditures	276.5		—		—		—		—			276.5
Loss from equity affiliates	—		—		—		—		61.2			61.2

Reconciliation of Adjusted EBITDA to consolidated income from continuing operations

A reconciliation of Adjusted EBITDA to consolidated loss from continuing operations, net of income taxes follows:

	Year Ended December 31,
	2014			2013			2012
	(Dollars in millions)
Total Adjusted EBITDA	$	814.0		$	1,047.2		$	1,836.5
Depreciation, depletion and amortization	(655.7		)	(740.3		)	(663.4		)
Asset retirement obligation expenses	(81.0		)	(66.5		)	(67.0		)
Asset impairment and mine closure costs	(154.4		)	(528.3		)	(929.0		)
Settlement charges related to the Patriot bankruptcy reorganization	—			(30.6		)	—
Change in deferred tax asset valuation allowance related to equity affiliates	(52.3		)	—			—
Amortization of basis difference related to equity affiliates	(5.7		)	(6.3		)	(4.6		)
Interest expense	(428.2		)	(425.2		)	(405.6		)
Interest income	15.4			15.7			24.5
Income tax (provision) benefit	(201.2		)	448.3			(262.3		)
Loss from continuing operations, net of income taxes	$	(749.1	)	$	(286.0	)	$	(470.9	)

Revenue as a percent of total revenue from external customers by geographic region

The following table presents revenues as a percent of total revenue from external customers by geographic region:

	Year Ended December 31,
	2014		2013		2012
U.S.	59.5	%	61.1	%	55.4	%
Japan	9.5	%	9.8	%	12.3	%
China	6.1	%	10.2	%	6.8	%
South Korea	5.2	%	3.8	%	5.8	%
Other	19.7	%	15.1	%	19.7	%
Total	100.0	%	100.0	%	100.0	%