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Retirement and Other Employee Benefits
 3 Months Ended
Mar. 28, 2014
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
 
March 28, 2014
 
March 29,
2013
Service cost
$
1.4

 
$
1.4

Interest cost
1.8

 
1.6

Expected return on assets
(1.1
)
 
(0.9
)
Amortization of net actuarial loss
0.3

 
0.5

Net periodic benefit costs
$
2.4

 
$
2.6



We funded our U.S. based non-contributory defined benefit pension plan by an additional $0.8 million during the quarter ended March 29, 2013. The funding was actuarially determined based on U.S. funding regulations. There was no additional funding during the quarter ended March 28, 2014.