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Pensions (Tables)
 3 Months Ended
Mar. 31, 2015
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 Plans
 
Three Months Ended 
 March 31,
 
Three Months Ended 
 March 31,
(in millions)
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
0.1

 
$
0.1

Interest cost
1.9

 
2.0

 
0.5

 
0.7

Amortization of actuarial loss
1.6

 
1.2

 
0.2

 
0.1

Expected return on plan assets
(2.5
)
 
(2.3
)
 
(0.7
)
 
(0.9
)
Net postretirement pension expense
$
1.0

 
$
0.9

 
$
0.1

 
$
—