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Pensions (Tables)
3 Months Ended
Mar. 31, 2017
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 
 March 31,
 
Three Months Ended 
 March 31,
(in millions)
2017
 
2016
 
2017
 
2016
Interest cost
$
1.9

 
$
2.0

 
$
0.3

 
$
0.5

Amortization of actuarial loss
0.6

 
1.4

 
0.2

 
0.2

Expected return on plan assets
(2.4
)
 
(2.6
)
 
(0.5
)
 
(0.6
)
Net postretirement pension expense
$
0.1

 
$
0.8

 
$

 
$
0.1