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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
After-tax components of comprehensive income (loss)
The following table sets forth the after-tax components of comprehensive (loss) income:
 
Foreign
Currency
Translation
Adjustment
 
Net
Actuarial Loss
Associated with
Postretirement
Plans and
Workers’
Compensation
Obligations
 
Prior Service
Cost Associated
with
Postretirement
Plans
 
Cash Flow
Hedges
 
Available-For-Sale Securities
 
Total
Accumulated
Other
Comprehensive
(Loss) Income
 
(Dollars in millions)
December 31, 2011
$
3.1

 
$
(464.9
)
 
$
(9.6
)
 
$
335.7

 
$
(6.7
)
 
$
(142.4
)
Net change in fair value
—

 
—

 
—

 
350.4

 
(15.5
)
 
334.9

Reclassification from other comprehensive income to earnings
—

 
53.2

 
2.2

 
(298.6
)
 
22.5

 
(220.7
)
Current period change
19.1

 
—

 
20.1

 
—

 
—

 
39.2

December 31, 2012
22.2

 
(411.7
)
 
12.7

 
387.5

 
0.3

 
11.0

Net change in fair value
—

 
—

 
—

 
(333.6
)
 
(12.3
)
 
(345.9
)
Reclassification from other comprehensive income to earnings
—

 
95.0

 
0.7

 
(209.6
)
 
12.8

 
(101.1
)
Current period change
(92.7
)
 
110.9

 
(1.4
)
 
—

 
—

 
16.8

December 31, 2013
(70.5
)
 
(205.8
)
 
12.0

 
(155.7
)
 
0.8

 
(419.2
)
Net change in fair value
—

 
—

 
—

 
(195.0
)
 
(3.7
)
 
(198.7
)
Reclassification from other comprehensive income to earnings
—

 
31.0

 
1.7

 
(10.2
)
 
2.9

 
25.4

Current period change
(41.0
)
 
(142.7
)
 
11.4

 
—

 
—

 
(172.3
)
December 31, 2014
$
(111.5
)
 
$
(317.5
)
 
$
25.1

 
$
(360.9
)
 
$
—

 
$
(764.8
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive (loss) income" into earnings during the year ended December 31, 2014:
 
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
 
Details about accumulated other comprehensive (loss) income components
 
Amount reclassified from accumulated other comprehensive (loss) income (1)
 
Amount reclassified from accumulated other comprehensive (loss) income (1)
 
Affected line item in the consolidated statement of operations
 
 
(Dollars in millions)
 
(Dollars in millions)
 
 
Net actuarial loss associated with postretirement plans and workers' compensation obligations:
 
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
(14.5
)
 
$
(24.1
)
 
Operating costs and expenses
Postretirement health care and life insurance benefits
 
—

 
(61.3
)
 
Settlement charges related to the Patriot bankruptcy reorganization
Defined benefit pension plans
 
(24.8
)
 
(54.4
)
 
Operating costs and expenses
Defined benefit pension plans
 
(8.7
)
 
—

 
Restructuring and pension settlement charges
Defined benefit pension plans
 
(5.4
)
 
(11.3
)
 
Selling and administrative expenses
Insignificant items
 
4.1

 
(1.1
)
 
 
 
 
(49.3
)
 
(152.2
)
 
Total before income taxes
 
 
18.3

 
57.2

 
Income tax benefit
 
 
$
(31.0
)
 
$
(95.0
)
 
Total after income taxes
 
 
 
 
 
 
 
Prior service credit (cost) associated with postretirement plans:
 
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
(1.3
)
 
$
1.7

 
Operating costs and expenses
Postretirement health care and life insurance benefits
 
—

 
(1.9
)
 
Settlement charges related to the Patriot bankruptcy reorganization
Defined benefit pension plans
 
(1.3
)
 
(1.0
)
 
Operating costs and expenses
 
 
(2.6
)
 
(1.2
)
 
Total before income taxes
 
 
0.9

 
0.5

 
Income tax benefit
 
 
$
(1.7
)
 
$
(0.7
)
 
Total after income taxes
 
 
 
 
 
 
 
Cash flow hedges:
 
 
 
 
 
 
Foreign currency forward contracts
 
$
(27.3
)
 
$
162.4

 
Operating costs and expenses
Fuel and explosives commodity swaps
 
(22.3
)
 
11.4

 
Operating costs and expenses
Coal trading commodity futures, swaps and options
 
63.9

 
130.6

 
Other revenues
Insignificant items
 
(0.4
)
 
(0.5
)
 
 
 
 
13.9

 
303.9

 
Total before income taxes
 
 
(3.7
)
 
(94.3
)
 
Income tax provision
 
 
$
10.2

 
$
209.6

 
Total after income taxes
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
Debt securities
 
$
—

 
$
0.2

 
Interest income
Equity securities
 
(4.7
)
 
(21.5
)
 
Asset impairment and mine closure costs
 
 
(4.7
)
 
(21.3
)
 
Total before income taxes
 
 
1.8

 
8.5

 
Income tax benefit
 
 
$
(2.9
)
 
$
(12.8
)
 
Total after income taxes
(1)    Presented as gains (losses) in the consolidated statements of operations.