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Retirement and Other Employee Benefits (Tables)
 3 Months Ended
Mar. 27, 2020
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
 
March 27,
2020
 
March 29,
2019
Service cost
$
1.6

 
$
1.4

Interest cost
1.5

 
1.7

Expected return on assets
(0.6
)
 
(0.8
)
Amortization of net actuarial loss
0.3

 
0.1

Net periodic benefit costs
$
2.8

 
$
2.4