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Retirement and Other Employee Benefits - Net Periodic Pension Cost of Defined Benefit Pension and Post-Retirement Benefit Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 27, 2024
Dec. 29, 2023
Dec. 30, 2022
Pension plans | United States      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 0.5 0.6 0.4
Expected return on assets (0.8) (0.8) (0.8)
Settlement (gain) loss 0.0 0.0 0.0
Net amortization 0.3 0.3 0.5
Net periodic cost (income) 0.0 0.1 0.1
Pension plans | United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 1.9 1.8 1.0
Expected return on assets (2.4) (2.4) (1.8)
Settlement (gain) loss 0.0 0.0 0.0
Net amortization 0.3 0.1 0.1
Net periodic cost (income) (0.2) (0.5) (0.7)
Post-retirement plans | Central America      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 7.2 6.0 5.7
Interest cost 5.1 5.2 3.9
Expected return on assets 0.0 0.0 0.0
Settlement (gain) loss (0.4) 0.0 0.0
Net amortization (0.3) 0.1 0.1
Net periodic cost (income) $ 11.6 $ 11.3 $ 9.7