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Segment and Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Operating segment results
Segment results for the year ended December 31, 2016 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
$
1,473.3

 
$
792.5

 
$
526.0

 
$
1,090.4

 
$
824.9

 
$
(10.9
)
 
$
19.1

 
$
4,715.3

Adjusted EBITDA
379.9

 
217.3

 
101.6

 
(16.3
)
 
217.6

 
(72.2
)
 
(335.7
)
 
492.2

Additions to property, plant, equipment and mine development
33.0

 
18.7

 
20.8

 
29.9

 
22.1

 
—

 
2.1

 
126.6

Federal coal lease expenditures
248.4

 
—

 
0.6

 
—

 
—

 
—

 
—

 
249.0

Income from equity affiliates
—

 
—

 
—

 
—

 
—

 
—

 
(16.2
)
 
(16.2
)
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
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
Assets as of December 31, 2016 were as follows:
 
U.S. Mining
 
Australian Mining
 
Trading and
Brokerage
 
Corporate
and Other
 
Consolidated
 
(Dollars in millions)
Total assets
$
4,255.9

 
$
5,402.2

 
$
128.7

 
$
1,990.9

 
$
11,777.7

Property, plant, equipment and mine development, net
3,970.6

 
3,905.8

 
0.2

 
900.1

 
8,776.7

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
$
4,105.8

 
$
5,319.9

 
$
217.2

 
$
1,304.0

 
$
10,946.9

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
Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations
A reconciliation of consolidated loss from continuing operations, net of income taxes to Adjusted EBITDA follows:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(Dollars in millions)
Loss from continuing operations, net of income taxes
$
(663.8
)
 
$
(1,783.2
)
 
$
(695.3
)
Depreciation, depletion and amortization
465.4

 
572.2

 
655.7

Asset retirement obligation expenses
41.8

 
45.5

 
81.0

Selling and administrative expenses related to debt restructuring
21.5

 
—

 
—

Asset impairment
247.9

 
1,277.8

 
154.4

Change in deferred tax asset valuation allowance related to equity affiliates
(7.5
)
 
(1.0
)
 
52.3

Amortization of basis difference related to equity affiliates
—

 
4.9

 
5.7

Interest expense
298.6

 
465.4

 
426.6

Loss on early debt extinguishment
29.5

 
67.8

 
1.6

Interest income
(5.7
)
 
(7.7
)
 
(15.4
)
Reorganization items, net
159.0

 
—

 
—

Income tax (benefit) provision
(94.5
)
 
(207.1
)
 
147.4

Total Adjusted EBITDA
$
492.2

 
$
434.6

 
$
814.0
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,
 
2016
 
2015
 
2014
U.S.
54.7
%
 
57.4
%
 
59.5
%
Japan
6.9
%
 
8.1
%
 
9.5
%
China
5.4
%
 
7.1
%
 
6.1
%
South Korea
1.5
%
 
4.1
%
 
5.2
%
Other
31.5
%
 
23.3
%
 
19.7
%
Total
100.0
%
 
100.0
%
 
100.0
%