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Retirement and Other Employee Benefits
 3 Months Ended
Mar. 27, 2020
Retirement Benefits [Abstract]  
Retirement and Other Employee Benefits Retirement and Other Employee Benefits
 
The following table sets forth the net periodic benefit costs of our defined benefit pension plans and post-retirement benefit plans (U.S. dollars in millions):
 
 
Quarter ended
 
March 27,
2020
 
March 29,
2019
Service cost
$
1.6

 
$
1.4

Interest cost
1.5

 
1.7

Expected return on assets
(0.6
)
 
(0.8
)
Amortization of net actuarial loss
0.3

 
0.1

Net periodic benefit costs
$
2.8

 
$
2.4

 


We provide certain other retirement benefits to certain employees who are not U.S.-based and are not included above. Generally, benefits under these programs are based on an employee’s length of service and level of compensation. These programs are immaterial to our consolidated financial statements. The net periodic benefit costs related to other non-U.S.-based plans is $0.8 million for the quarters ended March 27, 2020 and March 29, 2019.