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Retirement and Other Benefit Programs (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Net periodic benefit cost for the three months ended March 31, 2018 and 2017 is as follows:
 
Three months ended March 31,
 
2018
 
2017
(In millions)
U.S. pensions
 
International pensions
 
OPEB (U.S.)
 
U.S. pensions
 
International pensions
 
OPEB (U.S.)
Net periodic benefit cost
 

 
 

 
 

 
 

 
 

 
 

Service cost
$
—

 
$
9.5

 
$
—

 
$
3.7

 
$
9.4

 
$
0.3

Interest cost
3.9

 
1.3

 
0.1

 
3.9

 
1.2

 
0.3

Expected return on plan assets
(4.3
)
 
(2.0
)
 
—

 
(4.0
)
 
(1.8
)
 
—

Amortization of net prior service cost
—

 
—

 
(0.2
)
 
—

 
—

 
—

Amortization of actuarial gain
—

 
(0.3
)
 
—

 
—

 
—

 
—

Net periodic benefit cost
$
(0.4
)
 
$
8.5

 
$
(0.1
)
 
$
3.6

 
$
8.8

 
$
0.6