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Retirement and Other Employee Benefits
 9 Months Ended
Sep. 26, 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
 
Nine months ended
 
September 26,
2014
 
September 27,
2013
 
September 26,
2014
 
September 27,
2013
Service cost
$
1.4

 
$
1.4

 
$
4.1

 
$
4.2

Interest cost
1.7

 
1.6

 
5.3

 
4.7

Expected return on assets
(1.1
)
 
(0.9
)
 
(3.4
)
 
(2.6
)
Amortization of net actuarial loss
0.3

 
0.5

 
0.9

 
1.5

Net periodic benefit costs
$
2.3

 
$
2.6

 
$
6.9

 
$
7.8