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Postretirement and Other Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [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, 2017 and 2016 were as follows ($ in millions):

 
Three Months Ended June 30,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
—

 
$
—

 
0.3

 
$
0.3

 
$
—

 
$
—

Interest cost
1.2

 
1.3

 
0.1

 
0.1

 
—

 
—

Expected return on plan assets
(1.6
)
 
(1.7
)
 
(0.1
)
 
—

 
—

 
—

Amortizations and other
0.9

 
1.0

 
0.3

 
0.2

 
—

 
—

Net periodic benefit cost
$
0.5

 
$
0.6

 
$
0.6

 
$
0.6

 
$
—

 
$
—



 
Six Months Ended June 30,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
0.5

 
$
0.6

 
$
—

 
$
—

Interest cost
2.4

 
2.6

 
0.2

 
0.2

 
—

 
—

Expected return on plan assets
(3.2
)
 
(3.4
)
 
(0.1
)
 
(0.1
)
 
—

 
—

Amortizations and other
1.8

 
2.0

 
0.6

 
0.5

 
0.1

 
0.1

Net periodic benefit cost
$
1.0

 
$
1.2

 
$
1.2

 
$
1.2

 
$
0.1

 
$
0.1