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Retirement and Postretirement Benefits
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Retirement and Postretirement Benefits
Retirement and Postretirement Benefits
Components of the net periodic cost for retirement and postretirement benefits for the three months ended March 31, 2015 and 2014 were as follows:
 
U.S.
Defined Benefit Plans
 
Non-U.S.
Defined Benefit Plans
 
Postretirement
Medical Benefits
(Amounts in millions) 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
6.2

 
$
5.7

 
$
2.2

 
$
1.7

 
$
—

 
$
—

Interest cost
4.3

 
4.4

 
3.3

 
3.7

 
0.3

 
0.3

Expected return on plan assets
(6.1
)
 
(5.5
)
 
(3.0
)
 
(2.7
)
 
—

 
—

Amortization of prior service cost
0.1

 
0.1

 
—

 
0.1

 
—

 
—

Amortization of unrecognized net loss (gain)
2.3

 
2.0

 
1.3

 
1.7

 
(0.1
)
 
(0.4
)
Net periodic cost (benefit) recognized
$
6.8

 
$
6.7

 
$
3.8

 
$
4.5

 
$
0.2

 
$
(0.1
)