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Retirement and Postretirement Benefits
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016 were as follows:
 
U.S.
Defined Benefit Plans
 
Non-U.S.
Defined Benefit Plans
 
Postretirement
Medical Benefits
(Amounts in millions) 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost
$
6.2

 
$
5.9

 
$
1.7

 
$
1.8

 
$
—

 
$
—

Interest cost
4.3

 
4.8

 
2.2

 
2.9

 
0.2

 
0.3

Expected return on plan assets
(6.2
)
 
(6.1
)
 
(2.1
)
 
(2.7
)
 
—

 
—

Amortization of prior service cost
—

 
0.1

 
—

 
—

 
—

 
—

Amortization of unrecognized net loss (gain)
1.5

 
1.2

 
0.9

 
1.3

 
0.1

 
(0.1
)
Net periodic cost recognized
$
5.8

 
$
5.9

 
$
2.7

 
$
3.3

 
$
0.3

 
$
0.2