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Retirement and Other Employee Benefits
 9 Months Ended
Sep. 25, 2015
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 25,
2015
 
September 26,
2014
 
September 25,
2015
 
September 26,
2014
Service cost
$
1.4

 
$
1.4

 
$
4.3

 
$
4.1

Interest cost
1.7

 
1.7

 
5.0

 
5.3

Expected return on assets
(1.0
)
 
(1.1
)
 
(2.9
)
 
(3.4
)
Amortization of net actuarial loss
0.4

 
0.3

 
1.2

 
0.9

Net periodic benefit costs
$
2.5

 
$
2.3

 
$
7.6

 
$
6.9