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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
Foreign
Currency
Translation
Adjustment
 
Net
Actuarial Loss
Associated with
Postretirement
Plans and
Workers’
Compensation
Obligations
 
Prior Service
Credit (Cost) Associated
with
Postretirement
Plans
 
Cash Flow
Hedges
 
Available-For-Sale Securities
 
Total
Accumulated
Other
Comprehensive Loss
 
(Dollars in millions)
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
)
Net change in fair value
—

 
—

 
—

 
(131.3
)
 
—

 
(131.3
)
Reclassification from other comprehensive income to earnings
—

 
35.6

 
(3.7
)
 
251.7

 
—

 
283.6

Current period change
(34.9
)
 
18.1

 
10.4

 
—

 
—

 
(6.4
)
December 31, 2015
(146.4
)
 
(263.8
)
 
31.8

 
(240.5
)
 
—

 
(618.9
)
Net change in fair value
—

 
—

 
—

 
—

 
—

 
—

Reclassification from other comprehensive income to earnings
—

 
21.0

 
(5.6
)
 
146.3

 
—

 
161.7

Current period change
(1.8
)
 
(13.5
)
 
(4.5
)
 
—

 
—

 
(19.8
)
December 31, 2016
$
(148.2
)
 
$
(256.3
)
 
$
21.7

 
$
(94.2
)
 
$
—

 
$
(477.0
)
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 years ended December 31, 2016 and 2015:
 
 
Amount reclassified from accumulated other comprehensive loss (1)
 
 
 
 
Year Ended December 31
 
 
Details about accumulated other comprehensive loss components
 
2016
 
2015
 
Affected line item in the 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
 
$
(20.4
)
 
$
(24.9
)
 
Operating costs and expenses
Defined benefit pension plans
 
(20.5
)
 
(32.9
)
 
Operating costs and expenses
Defined benefit pension plans
 
(4.2
)
 
(6.7
)
 
Selling and administrative expenses
Workers' compensation amortization
 
11.7

 
8.0

 
Operating costs and expenses
 
 
(33.4
)
 
(56.5
)
 
Total before income taxes
 
 
12.4

 
20.9

 
Income tax benefit
 
 
$
(21.0
)
 
$
(35.6
)
 
Total after income taxes
 
 
 
 
 
 
 
Prior service credit (cost) associated with postretirement plans:
 
 
 
 
 
 
Postretirement health care and life insurance benefits
 
$
9.2

 
$
6.8

 
Operating costs and expenses
Defined benefit pension plans
 
(0.3
)
 
(1.0
)
 
Operating costs and expenses
 
 
8.9

 
5.8

 
Total before income taxes
 
 
(3.3
)
 
(2.1
)
 
Income tax benefit
 
 
$
5.6

 
$
3.7

 
Total after income taxes
 
 
 
 
 
 
 
Cash flow hedges:
 
 
 
 
 
 
Foreign currency forward contracts
 
$
(145.6
)
 
$
(316.4
)
 
Operating costs and expenses
Fuel and explosives commodity swaps
 
(86.1
)
 
(120.4
)
 
Operating costs and expenses
Coal trading commodity futures, swaps and options
 
—

 
51.8

 
Other revenues
Insignificant items
 
(0.5
)
 
(0.7
)
 
 
 
 
(232.2
)
 
(385.7
)
 
Total before income taxes
 
 
85.9

 
134.0

 
Income tax provision
 
 
$
(146.3
)
 
$
(251.7
)
 
Total after income taxes
(1)    Presented as gains (losses) in the consolidated statements of operations.