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Postretirement and Other Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Pension Benefit Costs
The components of net pension and OPEB benefit costs for U.S. employees and net pension benefit costs for French employees during the three months ended March 31, 2016 and 2015 were as follows ($ in millions):

 
Three Months Ended March 31,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
—

 
$
—

 
$
0.3

 
$
0.3

 
$
—

 
$
—

Interest cost
1.3

 
1.3

 
0.1

 
0.1

 
—

 
—

Expected return on plan assets
(1.7
)
 
(1.8
)
 
(0.1
)
 
(0.1
)
 
—

 
—

Amortizations and other
1.0

 
1.4

 
0.3

 
0.3

 
0.1

 
(0.1
)
Net periodic benefit cost
$
0.6

 
$
0.9

 
$
0.6

 
$
0.6

 
$
0.1

 
$
(0.1
)