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Pensions (Tables)
 6 Months Ended
Jun. 30, 2014
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)
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
0.1

 
$
0.1

 
$
0.2

 
$
0.1

Interest cost
1.9

 
1.9

 
3.9

 
3.7

 
0.6

 
0.6

 
1.3

 
1.2

Amortization of actuarial loss
1.3

 
1.9

 
2.5

 
3.7

 
0.1

 
0.2

 
0.2

 
0.4

Expected return on plan assets
(2.2
)
 
(2.2
)
 
(4.5
)
 
(4.4
)
 
(0.9
)
 
(0.7
)
 
(1.8
)
 
(1.3
)
Net postretirement pension expense (benefit)
$
1.0

 
$
1.6

 
$
1.9

 
$
3.0

 
$
(0.1
)
 
$
0.2

 
$
(0.1
)
 
$
0.4