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Retirement and Other Employee Benefits (Tables)
 6 Months Ended
Jun. 29, 2018
Retirement Benefits [Abstract]  
Net periodic benefit costs of pension plans and post-retirement plans
The following table sets forth the net periodic benefit costs of our defined benefit pension plans and post-retirement benefit plans (U.S. dollars in millions):
 
 
Quarter ended
 
Six months ended
 
June 29,
2018
 
June 30,
2017
 
June 29,
2018
 
June 30,
2017
Service cost
$
1.5

 
$
1.4

 
$
3.0

 
$
2.8

Interest cost
1.6

 
1.5

 
3.2

 
3.1

Expected return on assets
(0.9
)
 
(0.9
)
 
(1.8
)
 
(1.7
)
Amortization of net actuarial loss
0.2

 
0.3

 
0.4

 
0.6

Net periodic benefit costs
$
2.4

 
$
2.3

 
$
4.8

 
$
4.8