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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
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
 
Nine Months Ended
 
September 30,
2013
 
September 30,
2012
 
September 30,
2013
 
September 30,
2012
 
Amount
 
Percent
 
Amount
 
Percent
 
Amount
 
Percent
 
Amount
 
Percent
Tax provision at U.S. statutory rate
$
14.6

 
35.0
 %
 
$
17.2

 
35.0
 %
 
$
44.3

 
35.0
 %
 
$
38.4

 
35.0
 %
Tax benefits of foreign legal structure
—

 
—

 
—

 
—

 
(0.7
)
 
(0.6
)
 
(1.0
)
 
(0.9
)
Adjustments to valuation allowances
0.1

 
0.2

 
—

 
—

 
0.1

 
0.1

 
(0.4
)
 
(0.4
)
French business tax classified as income tax
0.6

 
1.5

 
0.5

 
1.0

 
1.7

 
1.3

 
1.8

 
1.7

Change in enacted foreign tax rate
—

 
—

 
0.3

 
0.6

 
—

 
—

 
0.9

 
0.8

Foreign income tax rate differential
(0.7
)
 
(1.7
)
 
(1.9
)
 
(3.8
)
 
(4.5
)
 
(3.5
)
 
(4.2
)
 
(3.8
)
Other foreign taxes, net
0.1

 
0.2

 
0.5

 
1.0

 
0.1

 
0.1

 
2.5

 
2.3

Other, net
(0.9
)
 
(2.1
)
 
0.1

 
0.2

 
(1.0
)
 
(0.8
)
 
(0.4
)
 
(0.4
)
Provision for income taxes
$
13.8

 
33.1
 %
 
$
16.7

 
34.0
 %
 
$
40.0

 
31.6
 %
 
$
37.6

 
34.3
 %