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Retirement and Other Employee Benefits
 9 Months Ended
Sep. 30, 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
 
Nine months ended
 
September 30,
2016
 
September 25,
2015
 
September 30,
2016
 
September 25,
2015
Service cost
$
1.3

 
$
1.4

 
$
3.9

 
$
4.3

Interest cost
1.7

 
1.7

 
4.9

 
5.0

Expected return on assets
(1.0
)
 
(1.0
)
 
(2.8
)
 
(2.9
)
Amortization of net actuarial loss
0.3

 
0.4

 
0.9

 
1.2

Net periodic benefit costs
$
2.3

 
$
2.5

 
$
6.9

 
$
7.6

 


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 $0.7 million for the quarters ended ended September 30, 2016 and $0.5 million for the quarters ended September 25, 2015. The net periodic benefit costs related to other non-U.S.-based plans is $1.9 million for the nine months ended September 30, 2016 and $1.6 million for the nine months ended September 25, 2015.