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Pensions (Tables)
 6 Months Ended
Jun. 30, 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 
 June 30,
 
Six Months Ended 
 June 30,
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(in millions)
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
—

 
—

 
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2

Interest cost
1.9

 
1.9

 
3.8

 
3.9

 
0.5

 
0.6

 
1.0

 
1.3

Amortization of actuarial loss
1.8

 
1.3

 
3.4

 
2.5

 
0.2

 
0.1

 
0.4

 
0.2

Expected return on plan assets
(2.6
)
 
(2.2
)
 
(5.1
)
 
(4.5
)
 
(0.7
)
 
(0.9
)
 
(1.4
)
 
(1.8
)
Net postretirement pension expense
$
1.1

 
$
1.0

 
2.1

 
1.9

 
$
0.1

 
$
(0.1
)
 
$
0.2

 
$
(0.1
)