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Pensions (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Summary of Components of Net Postretirement Pensions Expense
The following table summarizes the components of net postretirement pension expense:
 
 
U.S. Benefit Plan
 
Non-U.S. Benefit Plan
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(in millions)
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
0.1

 
$
0.1

 
$
0.2

Interest cost
1.8

 
1.5

 
5.5

 
5.5

 
0.7

 
0.7

 
1.9

 
2.0

Amortization of actuarial loss
1.9

 
1.3

 
5.6

 
4.1

 
0.2

 
0.2

 
0.6

 
0.6

Expected return on plan assets
(2.2
)
 
(1.6
)
 
(6.6
)
 
(6.0
)
 
(0.6
)
 
(0.7
)
 
(1.9
)
 
(2.0
)
Net postretirement pension expense
$
1.5

 
$
1.2

 
$
4.5

 
$
3.6

 
$
0.3

 
$
0.3

 
$
0.7

 
$
0.8