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Postretirement and Other Benefits Pension and OPEB Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
Postretirement and Other Benefits [Abstract]  
Schedule of Net 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 or nine months ended September 30, 2015 and 2014 were as follows ($ in millions):
 
Three Months Ended September 30,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
0.3

 
$
0.3

 
$
—

 
$
—

Interest cost
1.2

 
1.3

 
0.1

 
0.2

 
—

 
—

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

 
—

Amortizations and other
1.1

 
1.0

 
0.3

 
0.3

 
0.1

 
(0.1
)
Net periodic benefit cost
$
0.5

 
$
0.5

 
$
0.6

 
$
0.7

 
$
0.1

 
$
(0.1
)

 
Nine Months Ended September 30,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
0.9

 
$
1.0

 
$
—

 
$
—

Interest cost
3.8

 
4.1

 
0.3

 
0.7

 
—

 
0.1

Expected return on plan assets
(5.3
)
 
(5.5
)
 
(0.2
)
 
(0.3
)
 
—

 
—

Amortizations and other
3.9

 
3.2

 
0.9

 
0.8

 
(0.1
)
 
(0.5
)
Net periodic benefit cost
$
2.4

 
$
1.8

 
$
1.9

 
$
2.2

 
$
(0.1
)
 
$
(0.4
)