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Retirement and Other Employee Benefits
 6 Months Ended
Jun. 26, 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
 
Six months ended
 
June 26,
2015
 
June 27,
2014
 
June 26,
2015
 
June 27,
2014
Service cost
$
1.5

 
$
1.4

 
$
2.9

 
$
2.7

Interest cost
1.6

 
1.8

 
3.3

 
3.6

Expected return on assets
(0.9
)
 
(1.1
)
 
(1.9
)
 
(2.3
)
Amortization of net actuarial loss
0.4

 
0.3

 
0.8

 
0.6

Net periodic benefit costs
$
2.6

 
$
2.4

 
$
5.1

 
$
4.6