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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. 29, 2023
Dec. 30, 2022
Dec. 31, 2021
Pension plans | United States      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 0.6 0.4 0.3
Expected return on assets (0.8) (0.8) (0.8)
Net amortization 0.3 0.5 0.5
Net periodic cost (income) 0.1 0.1 0.0
Pension plans | United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 1.8 1.0 1.0
Expected return on assets (2.4) (1.8) (1.4)
Net amortization 0.1 0.1 0.1
Net periodic cost (income) (0.5) (0.7) (0.3)
Post-retirement plans | Central America      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6.0 5.7 6.0
Interest cost 5.2 3.9 4.0
Expected return on assets 0.0 0.0 0.0
Net amortization 0.1 0.1 0.0
Net periodic cost (income) $ 11.3 $ 9.7 $ 10.0