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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Components of accumulated other comprehensive (loss) income
The following tables set forth the changes in the balance of accumulated other comprehensive loss, net of tax, by component:
 
 
Benefit Plans
 
Currency Translation Adjustments
 
Total
 
 
(Dollars in millions)
At December 31, 2012
 
$
(6.6
)
 
$
(1.3
)
 
$
(7.9
)
Other comprehensive loss before reclassifications
 
—

 
(10.0
)
 
(10.0
)
Amounts reclassified from accumulated other comprehensive
   loss
 
(1.9
)
 
—

 
(1.9
)
Retirement benefit plans funded status adjustment
 
5.7

 
—

 
5.7

Net current period other comprehensive income (loss)
 
3.8

 
(10.0
)
 
(6.2
)
At December 31, 2013
 
$
(2.8
)
 
$
(11.3
)
 
$
(14.1
)
Other comprehensive loss before reclassifications
 
—

 
(0.8
)
 
(0.8
)
Amounts reclassified from accumulated other comprehensive
   loss
 
(4.0
)
 
—

 
(4.0
)
Retirement benefit plans funded status adjustment
 
(2.6
)
 
—

 
(2.6
)
Net current period other comprehensive loss
 
(6.6
)
 
(0.8
)
 
(7.4
)
At December 31, 2014
 
$
(9.4
)
 
$
(12.1
)
 
$
(21.5
)
Impact of Net Income on Reclassification Adjustments
The impact of net income on reclassification adjustments from accumulated other comprehensive loss were as follows:
 
 
December 31,
 
2014
 
2013
 
2012
 
(Dollars in millions)
 
 
Amortization of benefit plans to net income:
 
 
 
 
 
 
Prior service benefit and curtailment gain
 
$
8.1

 
$
5.7

 
$
5.6

Actuarial loss
 
(1.4
)
 
(2.5
)
 
(2.5
)
Total before taxes
 
6.7

 
3.2

 
3.1

Income tax benefit
 
(2.7
)
 
(1.3
)
 
(1.2
)
Total, net of tax
 
$
4.0

 
$
1.9

 
$
1.9