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Segment and Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Operating segment results
Segment results for the year ended December 31, 2015 were as follows:
 
Powder River Basin Mining
 
Midwestern
U.S. Mining
 
Western
U.S. Mining
 
Australian Metallurgical Mining
 
Australian Thermal Mining
 
Trading and
Brokerage
 
Corporate
and Other
 
Consolidated
 
(Dollars in millions)
Revenues
$
1,865.9

 
$
981.2

 
$
682.3

 
$
1,181.9

 
$
823.5

 
$
42.8

 
$
31.6

 
$
5,609.2

Adjusted EBITDA
482.9

 
269.7

 
184.6

 
(18.2
)
 
193.6

 
27.0

 
(705.0
)
 
434.6

Additions to property, plant, equipment and mine development
15.0

 
51.3

 
19.3

 
25.5

 
13.6

 
—

 
2.1

 
126.8

Federal coal lease expenditures
276.9

 
—

 
0.3

 
—

 
—

 
—

 
—

 
277.2

Loss from equity affiliates
—

 
—

 
—

 
—

 
—

 
—

 
15.9

 
15.9

Segment results for the year ended December 31, 2014 were as follows:
 
Powder River Basin Mining
 
Midwestern
U.S. Mining
 
Western
U.S. Mining
 
Australian Metallurgical Mining
 
Australian Thermal Mining
 
Trading and
Brokerage
 
Corporate
and Other
 
Consolidated
 
(Dollars in millions)
Revenues
$
1,922.9

 
$
1,198.1

 
$
902.8

 
$
1,613.8

 
$
1,058.0

 
$
58.4

 
$
38.2

 
$
6,792.2

Adjusted EBITDA
509.0

 
306.9

 
266.9

 
(151.1
)
 
264.1

 
14.9

 
(396.7
)
 
814.0

Additions to property, plant, equipment and mine development
19.7

 
57.4

 
18.2

 
53.9

 
30.2

 
—

 
15.0

 
194.4

Federal coal lease expenditures
276.5

 
—

 
0.2

 
—

 
—

 
—

 
—

 
276.7

Loss from equity affiliates
—

 
—

 
—

 
—

 
—

 
—

 
107.6

 
107.6

Segment results for the year ended December 31, 2013 were as follows:
 
Powder River Basin Mining
 
Midwestern
U.S. Mining
 
Western
U.S. Mining
 
Australian Metallurgical Mining
 
Australian Thermal Mining
 
Trading and
Brokerage
 
Corporate
and Other
 
Consolidated
 
(Dollars in millions)
Revenues
$
1,767.3

 
$
1,335.5

 
$
902.3

 
$
1,773.4

 
$
1,131.2

 
$
66.0

 
$
38.0

 
$
7,013.7

Adjusted EBITDA
435.4

 
426.0

 
258.0

 
(120.0
)
 
270.0

 
(19.9
)
 
(202.3
)
 
1,047.2

Additions to property, plant, equipment and mine development
15.8

 
27.2

 
32.2

 
165.7

 
64.6

 
0.1

 
22.8

 
328.4

Federal coal lease expenditures
276.5

 
—

 
0.3

 
—

 
—

 
—

 
—

 
276.8

Loss from equity affiliates
—

 
—

 
—

 
—

 
—

 
—

 
40.2

 
40.2
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
Assets as of December 31, 2015 were as follows:
 
U.S. Mining
 
Australian Mining
 
Trading and
Brokerage
 
Corporate
and Other
 
Consolidated
 
(Dollars in millions)
Total assets
$
4,180.2

 
$
5,319.9

 
$
217.2

 
$
1,304.0

 
$
11,021.3

Property, plant, equipment and mine development, net
3,854.5

 
4,469.6

 
0.5

 
933.9

 
9,258.5

Assets as of December 31, 2014 were as follows:
 
U.S. Mining
 
Australian Mining
 
Trading and
Brokerage
 
Corporate
and Other
 
Consolidated
 
(Dollars in millions)
Total assets
$
4,099.1

 
$
6,623.9

 
$
300.7

 
$
2,167.4

 
$
13,191.1

Property, plant, equipment and mine development, net
3,739.9

 
5,503.7

 
1.1

 
1,332.6

 
10,577.3

Assets as of December 31, 2013 were as follows:
 
U.S. Mining
 
Australian Mining
 
Trading and
Brokerage
 
Corporate
and Other
 
Consolidated
 
(Dollars in millions)
Total assets
$
4,024.4

 
$
7,081.2

 
$
389.6

 
$
2,638.2

 
$
14,133.4

Property, plant, equipment and mine development, net
3,654.4

 
5,947.1

 
1.8

 
1,479.2

 
11,082.5
Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations
A reconciliation of Adjusted EBITDA to consolidated loss from continuing operations, net of income taxes follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
Total Adjusted EBITDA
$
434.6

 
$
814.0

 
$
1,047.2

Depreciation, depletion and amortization
(572.2
)
 
(655.7
)
 
(740.3
)
Asset retirement obligation expenses
(45.5
)
 
(81.0
)
 
(66.5
)
Asset impairment
(1,277.8
)
 
(154.4
)
 
(528.3
)
Settlement charges related to the Patriot bankruptcy reorganization
—

 
—

 
(30.6
)
Change in deferred tax asset valuation allowance related to equity affiliates
1.0

 
(52.3
)
 
—

Amortization of basis difference related to equity affiliates
(4.9
)
 
(5.7
)
 
(6.3
)
Interest expense
(533.2
)
 
(428.2
)
 
(425.2
)
Interest income
7.7

 
15.4

 
15.7

Income tax benefit (provision)
176.4

 
(201.2
)
 
448.3

 Loss from continuing operations, net of income taxes
$
(1,813.9
)
 
$
(749.1
)
 
$
(286.0
)
Revenues 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,
 
2015
 
2014
 
2013
U.S.
57.4
%
 
59.5
%
 
61.1
%
Japan
8.1
%
 
9.5
%
 
9.8
%
China
7.1
%
 
6.1
%
 
10.2
%
South Korea
4.1
%
 
5.2
%
 
3.8
%
Other
23.3
%
 
19.7
%
 
15.1
%
Total
100.0
%
 
100.0
%
 
100.0
%