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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Loss from continuing operations before income taxes
Loss from continuing operations before income taxes for the years ended December 31, 2015, 2014 and 2013 consisted of the following:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
U.S. 
$
(515.9
)
 
$
268.9

 
$
220.6

Non-U.S. 
(1,474.4
)
 
(816.8
)
 
(954.9
)
Total
$
(1,990.3
)
 
$
(547.9
)
 
$
(734.3
)
Components of income tax provision (benefit)
Total income tax (benefit) provision for the years ended December 31, 2015, 2014 and 2013 consisted of the following:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
Current:
 

 
 

 
 

U.S. federal
$
(71.9
)
 
$
27.1

 
$
(47.9
)
Non-U.S. 
3.7

 
(61.1
)
 
38.4

State
(0.6
)
 
3.3

 
(4.7
)
Total current
(68.8
)
 
(30.7
)
 
(14.2
)
Deferred:
 

 
 

 
 

U.S. federal
(117.4
)
 
111.0

 
4.8

Non-U.S. 
15.7

 
122.3

 
(440.3
)
State
(5.9
)
 
(1.4
)
 
1.4

Total deferred
(107.6
)
 
231.9

 
(434.1
)
Total income tax (benefit) provision
$
(176.4
)
 
$
201.2

 
$
(448.3
)
Reconciliation of the expected statutory federal income tax provision (benefit) to the Company's actual income tax provision
The following is a reconciliation of the expected statutory federal income tax benefit to the Company’s income tax (benefit) provision for the years ended December 31, 2015, 2014 and 2013:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
Expected income tax benefit at U.S. federal statutory rate
$
(696.6
)
 
$
(191.7
)
 
$
(257.0
)
Changes in valuation allowance, income tax
462.0

 
569.4

 
(29.4
)
Changes in tax reserves
(21.4
)
 
(81.5
)
 
8.8

Excess depletion
(53.7
)
 
(65.3
)
 
(72.7
)
Foreign earnings repatriation
—

 
(71.4
)
 
—

Foreign earnings provision differential
146.5

 
28.8

 
62.7

General business tax credits
(15.7
)
 
(19.2
)
 
(18.9
)
Minerals resource rent tax, net of federal tax
—

 
16.1

 
(87.4
)
Remeasurement of foreign income tax accounts
(0.5
)
 
(2.7
)
 
(44.3
)
State income taxes, net of federal tax benefit
(20.1
)
 
(2.3
)
 
(0.2
)
Other, net
23.1

 
21.0

 
(9.9
)
Total income tax (benefit) provision
$
(176.4
)
 
$
201.2

 
$
(448.3
)
Tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities
The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities as of December 31, 2015 and 2014 consisted of the following:
 
December 31,
 
2015
 
2014
 
(Dollars in millions)
Deferred tax assets:
 

 
 

Tax credits and loss carryforwards
$
1,817.4

 
$
1,723.5

Accrued postretirement benefit obligations
372.4

 
372.3

Asset retirement obligations
160.9

 
167.0

Employee benefits
69.6

 
70.7

Payable to voluntary employee beneficiary association for certain Patriot retirees (1)
52.9

 
79.2

Hedge activities
26.6

 
44.2

Environmental contingencies
—

 
29.9

Deferred revenue
—

 
29.1

Financial guarantees
16.9

 
16.9

Workers’ compensation obligations
13.7

 
6.2

Other
66.7

 
50.5

Total gross deferred tax assets
2,597.1

 
2,589.5

Deferred tax liabilities:
 

 
 

Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments
966.6

 
1,223.4

Unamortized discount on Convertible Junior Subordinated Debentures
130.3

 
131.0

Investments and other assets
70.1

 
73.4

Other
—

 
1.1

Total gross deferred tax liabilities
1,167.0

 
1,428.9

Valuation allowance, income tax
(1,447.3
)
 
(1,169.0
)
Net deferred tax liability
$
(17.2
)
 
$
(8.4
)
Deferred taxes are classified as follows:
 

 
 

Current deferred income taxes
$
49.7

 
$
80.0

Noncurrent deferred income taxes
(66.9
)
 
(88.4
)
Net deferred tax liability
$
(17.2
)
 
$
(8.4
)
(1)  
Refer to Note 25. "Matters Related to the Bankruptcy of Patriot Coal Corporation" herein for additional details related to this transaction.
Summary of Income Tax Contingencies [Table Text Block]
Net unrecognized tax benefits (excluding interest and penalties) were recorded as follows in the consolidated balance sheets as of December 31, 2015 and 2014:
 
December 31,
 
2015
 
2014
 
(Dollars in millions)
Accounts payable and accrued expenses
$
—

 
$
—

Deferred income taxes
7.9

 
6.2

Other noncurrent liabilities
11.7

 
34.7

Net unrecognized tax benefits
$
19.6

 
$
40.9

Gross unrecognized tax benefits
$
22.9

 
$
44.5
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the years ended December 31, 2015, 2014 and 2013 is as follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
Balance at beginning of period
$
44.5

 
$
143.9

 
$
122.8

Additions for current year tax positions
2.3

 
12.0

 
6.3

(Reductions) additions for prior year tax positions
(23.5
)
 
—

 
63.8

Reductions for settlements with tax authorities
(0.4
)
 
(111.4
)
 
—

Reductions for expirations of statutes of limitations
—

 
—

 
(49.0
)
Balance at end of period
$
22.9

 
$
44.5

 
$
143.9
Summary of Companys tax (refunds) payments
The following table summarizes the Company’s income tax (refunds) payments, net for the years ended December 31, 2015, 2014 and 2013:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
U.S. — federal
$
(38.1
)
 
$
(7.7
)
 
$
(0.8
)
U.S. — state and local
0.4

 
(6.8
)
 
2.9

Non-U.S. 
11.9

 
(2.2
)
 
79.8

Total income tax (refunds) payments, net
$
(25.8
)
 
$
(16.7
)
 
$
81.9