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Retirement and Other Employee Benefits (Tables)
9 Months Ended
Sep. 28, 2012
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Pension Cost of Defined Benefit Pension and Post-Retirement Benefit Plans
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 28, 2012
 
September 30,
2011
 
September 28, 2012
 
September 30,
2011
Service cost
$
1.1

 
$
0.9

 
$
3.2

 
$
2.7

Interest cost
1.6

 
1.7

 
4.7

 
5.2

Expected return on assets
(0.9
)
 
(1.0
)
 
(2.6
)
 
(2.9
)
Amortization of net actuarial loss
0.3

 
0.4

 
1.0

 
1.1

Net periodic benefit costs
$
2.1

 
$
2.0

 
$
6.3

 
$
6.1