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Retirement and Other Employee Benefits
 6 Months Ended
Jul. 01, 2016
Compensation and Retirement Disclosure [Abstract]  
Retirement and Other Employee Benefits
Retirement and Other Employee Benefits
 
The following table sets forth the net periodic benefit costs of our pension plans and post-retirement plans (U.S. dollars in millions):
 
 
Quarter ended
 
Six months ended
 
July 1,
2016
 
June 26,
2015
 
July 1,
2016
 
June 26,
2015
Service cost
$
1.3

 
$
1.5

 
$
2.6

 
$
2.9

Interest cost
1.6

 
1.6

 
3.3

 
3.3

Expected return on assets
(0.9
)
 
(0.9
)
 
(1.9
)
 
(1.9
)
Amortization of net actuarial loss
0.3

 
0.4

 
0.6

 
0.8

Net periodic benefit costs
$
2.3

 
$
2.6

 
$
4.6

 
$
5.1

 


We provide certain other retirement benefits to certain employees who are not U.S.-based 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 $0.5 million for the quarters ended ended July 1, 2016 and June 26, 2015. The net periodic benefit costs related to other non-U.S.-based plans is $1.1 million for the six months ended July 1, 2016 and June 26, 2015.