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Retirement and Other Employee Benefits (Tables)
3 Months Ended
Apr. 01, 2016
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
 
April 1,
2016
 
March 27,
2015
Service cost
$
1.3

 
$
1.4

Interest cost
1.7

 
1.7

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

 
0.4

Net periodic benefit costs
$
2.3

 
$
2.5