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Postretirement and Other Benefits (Tables)
6 Months Ended
Jun. 30, 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 and six months ended June 30, 2016 and 2015 were as follows ($ in millions):

 
Three Months Ended June 30,
 
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
)
 
(1.7
)
 

 

 

 

Amortizations and other
1.0

 
1.4

 
0.2

 
0.3

 

 
(0.1
)
Net periodic benefit cost
$
0.6

 
$
1.0

 
$
0.6

 
$
0.7

 
$

 
$
(0.1
)

 
Six Months Ended June 30,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$

 
$

 
$
0.6

 
$
0.6

 
$

 
$

Interest cost
2.6

 
2.6

 
0.2

 
0.2

 

 

Expected return on plan assets
(3.4
)
 
(3.5
)
 
(0.1
)
 
(0.1
)
 

 

Amortizations and other
2.0

 
2.8

 
0.5

 
0.6

 
0.1

 
(0.2
)
Net periodic benefit cost
$
1.2

 
$
1.9

 
$
1.2

 
$
1.3

 
$
0.1

 
$
(0.2
)