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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2012
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 income (loss):
 
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
Income (Loss)
 
(Dollars in millions)
December 31, 2009
$
3.1

 
$
(343.5
)
 
$
(10.4
)
 
$
167.3

 
$
—

 
$
(183.5
)
Net change in fair value
—

 
—

 
—

 
229.9

 
—

 
229.9

Reclassification from other comprehensive income to earnings
—

 
31.8

 
2.5

 
(102.4
)
 
—

 
(68.1
)
Current period change
—

 
(41.3
)
 
(4.9
)
 
—

 
—

 
(46.2
)
December 31, 2010
3.1

 
(353.0
)
 
(12.8
)
 
294.8

 
—

 
(67.9
)
Net change in fair value
—

 
—

 
—

 
291.9

 
(5.8
)
 
286.1

Reclassification from other comprehensive income to earnings
—

 
38.2

 
2.3

 
(251.0
)
 
(0.9
)
 
(211.4
)
Current period change
—

 
(150.1
)
 
0.9

 
—

 
—

 
(149.2
)
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