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Retirement Plans and Other Retiree Benefits
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Retirement Plans and Other Retiree Benefits
Retirement Plans and Other Retiree Benefits

Components of Net periodic benefit cost for the three months ended March 31, 2020 and 2019 were as follows:

 
Three Months Ended March 31,
 
Pension Benefits
 
Other Retiree Benefits
 
United States
 
International
 
 
 
 
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Service cost
$
—

 
$
—

 
$
4

 
$
4

 
$
6

 
$
4

Interest cost
19

 
23

 
5

 
5

 
11

 
11

Expected return on plan assets
(27
)
 
(26
)
 
(4
)
 
(5
)
 
—

 
(1
)
Amortization of actuarial loss (gain)
11

 
13

 
1

 
2

 
5

 
2

Net periodic benefit cost
$
3

 
$
10

 
$
6

 
$
6

 
$
22

 
$
16


For the three months ended March 31, 2020 and 2019, the Company made voluntary contributions to its U.S. postretirement plans of $0 and $102, respectively.