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Pensions (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Summary of Components of Net Postretirement Pensions Expense
The following table summarizes the components of net postretirement pension expense (benefit): 
 
U.S. Benefit Plan
 
Non-U.S. Benefit Plan
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(in millions)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
0.1

 
$
0.1

 
$
0.1

Interest cost
1.6

 
1.9

 
3.2

 
3.8

 
0.4

 
0.4

 
0.7

 
0.7

Amortization of actuarial loss
0.7

 
0.6

 
1.5

 
1.2

 
0.1

 
0.1

 
0.3

 
0.3

Expected return on plan assets
(2.2
)
 
(2.4
)
 
(4.4
)
 
(4.8
)
 
(0.6
)
 
(0.5
)
 
(1.2
)
 
(1.0
)
Net postretirement pension expense (benefit)
$
0.1

 
$
0.1

 
$
0.3

 
$
0.2

 
$
(0.1
)
 
$
0.1

 
$
(0.1
)
 
$
0.1