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Retirement and Other Employee Benefits (Tables)
 6 Months Ended
Jun. 26, 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 endedSix months ended
June 26,
2020		June 28,
2019		June 26,
2020		June 28,
2019
Service cost$1.6  $1.4  $3.2  $2.8  
Interest cost1.5  1.7  2.9  3.4  
Expected return on assets(0.6) (0.8) (1.2) (1.6) 
Amortization of net actuarial loss0.3  0.1  0.6  0.2  
Net periodic benefit costs$2.8  $2.4  $5.5  $4.8