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Postretirement and Other Benefits Pension and OPEB Benefits (Tables)
 9 Months Ended
Sep. 30, 2014
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 and nine months ended September 30, 2014 and 2013 were as follows ($ in millions):
 
Three Months Ended September 30,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
—

 
$
—

 
$
0.3

 
$
0.3

 
$
—

 
$
0.1

Interest cost
1.3

 
1.3

 
0.2

 
0.2

 
—

 
—

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

 
—

Amortizations and other
1.0

 
1.5

 
0.3

 
0.3

 
(0.1
)
 
(0.3
)
Curtailment benefit
—

 
—

 
—

 
—

 
—

 
(3.2
)
Net periodic benefit cost
$
0.5

 
$
1.1

 
$
0.7

 
$
0.7

 
$
(0.1
)
 
$
(3.4
)
 
Nine Months Ended September 30,
 
U.S. Pension Benefits
 
French Pension Benefits
 
U.S. OPEB Benefits
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
—

 
$
—

 
$
1.0

 
$
0.9

 
$
—

 
$
0.1

Interest cost
4.1

 
3.9

 
0.7

 
0.6

 
0.1

 
0.1

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

 
—

Amortizations and other
3.2

 
5.0

 
0.8

 
0.8

 
(0.5
)
 
(0.7
)
Curtailment benefit
—

 
—

 
—

 
—

 
—

 
(3.2
)
Net periodic benefit cost
$
1.8

 
$
3.6

 
$
2.2

 
$
2.0

 
$
(0.4
)
 
$
(3.7
)