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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
After-tax components of comprehensive loss
The following table sets forth the after-tax components of accumulated other comprehensive loss and changes thereto recorded during the nine months ended September 30, 2016:
 
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
 
Total
Accumulated
Other
Comprehensive
Loss
 
(Dollars in millions)
December 31, 2015
$
(146.4
)
 
$
(263.8
)
 
$
31.8

 
$
(240.5
)
 
$
(618.9
)
Reclassification from other comprehensive income to earnings
—

 
15.8

 
(5.0
)
 
119.0

 
129.8

Current period change
2.4

 
—

 
—

 
—

 
2.4

September 30, 2016
$
(144.0
)
 
$
(248.0
)
 
$
26.8

 
$
(121.5
)
 
$
(486.7
)
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" into earnings during the three months ended September 30, 2016 and 2015:
 
 
Amount reclassified from accumulated other comprehensive loss (1)
 
 
Details about accumulated other comprehensive loss components
 
Three Months Ended September 30, 2016
 
Three Months Ended September 30, 2015
 
Affected line item in the unaudited condensed consolidated statement of operations
 
 
(Dollars in millions)
 
 
Net actuarial loss associated with postretirement plans and workers' compensation obligations:
 
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
(5.2
)
 
$
(6.3
)
 
Operating costs and expenses
Defined benefit pension plans
 
(5.1
)
 
(8.2
)
 
Operating costs and expenses
Defined benefit pension plans
 
(1.1
)
 
(1.6
)
 
Selling and administrative expenses
Insignificant items
 
3.0

 
2.0

 
 
 
 
(8.4
)
 
(14.1
)
 
Total before income taxes
 
 
3.1

 
1.6

 
Income tax benefit
 
 
$
(5.3
)
 
$
(12.5
)
 
Total after income taxes
 
 
 
 
 
 
 
Prior service credit associated with postretirement plans:
 
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
2.8

 
$
1.7

 
Operating costs and expenses
Defined benefit pension plans
 
(0.1
)
 
(0.2
)
 
Operating costs and expenses
 
 
2.7

 
1.5

 
Total before income taxes
 
 
(1.0
)
 
0.2

 
Income tax (provision) benefit

 
 
$
1.7

 
$
1.7

 
Total after income taxes
 
 
 
 
 
 
 
Cash flow hedges:
 
 
 
 
 
 
Foreign currency cash flow hedge contracts
 
(28.0
)
 
$
(84.5
)
 
Operating costs and expenses
Fuel and explosives commodity swaps
 
(19.4
)
 
(32.4
)
 
Operating costs and expenses
Coal trading futures, swaps and options
 
—

 
13.2

 
Other revenues
Insignificant items
 
(0.1
)
 
(0.2
)
 
 
 
 
(47.5
)
 
(103.9
)
 
Total before income taxes
 
 
17.6

 
35.0

 
Income tax benefit

 
 
$
(29.9
)
 
$
(68.9
)
 
Total after income taxes
(1)  
Presented as gains (losses) in the unaudited condensed consolidated statements of operations.
The following table provides additional information regarding items reclassified out of "Accumulated other comprehensive loss" into earnings during the nine months ended September 30, 2016 and 2015:
 
 
Amount reclassified from accumulated other comprehensive loss (1)
 
 
Details about accumulated other comprehensive loss components
 
Nine Months Ended September 30, 2016
 
Nine Months Ended September 30, 2015
 
Affected line item in the unaudited condensed consolidated statement of operations
 
 
(Dollars in millions)
 
 
Net actuarial loss associated with postretirement plans and workers' compensation obligations:
 
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
(15.4
)
 
$
(18.7
)
 
Operating costs and expenses
Defined benefit pension plans
 
(15.3
)
 
(24.7
)
 
Operating costs and expenses
Defined benefit pension plans
 
(3.2
)
 
(5.0
)
 
Selling and administrative expenses
Insignificant items
 
8.8

 
6.0

 
 
 
 
(25.1
)
 
(42.4
)
 
Total before income taxes
 
 
9.3

 
12.1

 
Income tax benefit
 
 
$
(15.8
)
 
$
(30.3
)
 
Total after income taxes
 
 
 
 
 
 
 
Prior service credit associated with postretirement plans:
 
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
8.3

 
$
5.1

 
Operating costs and expenses
Defined benefit pension plans
 
(0.3
)
 
(0.7
)
 
Operating costs and expenses
 
 
8.0

 
4.4

 
Total before income taxes
 
 
(3.0
)
 
(0.9
)
 
Income tax provision

 
 
$
5.0

 
$
3.5

 
Total after income taxes
 
 
 
 
 
 
 
Cash flow hedges:
 
 
 
 
 
 
Foreign currency cash flow hedge contracts
 
$
(122.1
)
 
$
(238.9
)
 
Operating costs and expenses
Fuel and explosives commodity swaps
 
(66.4
)
 
(87.7
)
 
Operating costs and expenses
Coal trading futures, swaps and options
 
—

 
35.6

 
Other revenues
Insignificant items
 
(0.4
)
 
(0.5
)
 
 
 
 
(188.9
)
 
(291.5
)
 
Total before income taxes
 
 
69.9

 
107.6

 
Income tax benefit

 
 
$
(119.0
)
 
$
(183.9
)
 
Total after income taxes
(1)  
Presented as gains (losses) in the unaudited condensed consolidated statements of operations.