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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of income taxes computed at the U.S. Federal statutory income tax rate to the provision for income taxes is as follows ($ in millions): 
 
Three Months Ended
 
March 31,
2014
 
March 31,
2013
 
Amount
 
Percent
 
Amount
 
Percent
Tax provision at U.S. statutory rate
$
11.3

 
35.0
 %
 
$
14.9

 
35.0
 %
Foreign income tax rate differential
(2.3
)
 
(7.1
)
 
(1.8
)
 
(4.2
)
Tax effects of foreign legal structure
0.3

 
0.9

 
(0.3
)
 
(0.7
)
French business tax classified as income tax
0.5

 
1.4

 
0.6

 
1.4

Other foreign taxes, net
(0.4
)
 
(1.2
)
 
(0.8
)
 
(1.8
)
Other, net
0.4

 
1.2

 
(0.2
)
 
(0.4
)
Provision for income taxes
$
9.8

 
30.2
 %
 
$
12.4

 
29.3
 %