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Retirement Plans and Other Retiree Benefits
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Retirement Plans and Other Retiree Benefits
Retirement Plans and Other Retiree Benefits

Components of Net periodic benefit cost for the three and six months ended June 30, 2018 and 2017 were as follows:
 
Pension Benefits
 
Other Retiree Benefits
 
United States
 
International
 
 
 
 
 
Three Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
1

 
$
1

 
$
3

 
$
3

 
$
4

 
$
4

Interest cost
22

 
23

 
5

 
5

 
9

 
10

Expected return on plan assets
(29
)
 
(28
)
 
(5
)
 
(5
)
 
—

 
—

Amortization of transition and prior service costs (credits)
—

 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
11

 
12

 
2

 
3

 
5

 
4

Net periodic benefit cost
$
5

 
$
8

 
$
5

 
$
6

 
$
18

 
$
18


 
Pension Benefits
 
Other Retiree Benefits
 
United States
 
International
 
 
 
 
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
1

 
$
1

 
$
7

 
$
7

 
$
8

 
$
8

Interest cost
43

 
47

 
11

 
10

 
19

 
21

Expected return on plan assets
(58
)
 
(55
)
 
(11
)
 
(10
)
 
—

 
—

Amortization of transition and prior service costs (credits)
—

 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
23

 
24

 
4

 
5

 
9

 
8

Net periodic benefit cost
$
9

 
$
17

 
$
11

 
$
12

 
$
36

 
$
37



For the six months ended June 30, 2018 and 2017, the Company made voluntary contributions to its U.S. postretirement plans of $0 and $57, respectively.