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Retirement and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Cost for Pension and Postretirement Benefits
Components of the net periodic cost for retirement and postretirement benefits for the three months ended March 31, 2019 and 2018 were as follows:
 
U.S.
Defined Benefit Plans
 
Non-U.S.
Defined Benefit Plans
 
Postretirement
Medical Benefits
(Amounts in millions) 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
5.6

 
$
6.0

 
$
1.5

 
$
1.8

 
$
—

 
$
—

Interest cost
4.5

 
4.0

 
2.2

 
2.3

 
0.2

 
0.2

Expected return on plan assets
(6.5
)
 
(6.5
)
 
(1.9
)
 
(2.2
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
0.1

 
—

 
—

 
—

Amortization of unrecognized net loss (gain)
0.9

 
1.4

 
0.7

 
0.9

 
(0.1
)
 
(0.1
)
Net periodic cost recognized
$
4.5

 
$
4.9

 
$
2.6

 
$
2.8

 
$
0.1

 
$
0.1