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. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Pension plans | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	0.5	0.6	0.7
Expected return on assets	(1.0)	(1.0)	(1.0)
Net amortization	0.4	0.4	0.3
Net periodic cost (income)	(0.1)	0.0	0.0
Pension plans | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0
Interest cost	1.5	1.5	1.9
Expected return on assets	(2.5)	(2.4)	(2.6)
Net amortization	(0.4)	0.0	0.0
Net periodic cost (income)	(1.4)	(0.9)	(0.7)
Post-retirement plans | Central America
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.9	5.6	5.2
Interest cost	4.0	4.4	3.8
Expected return on assets	0.0	0.0	0.0
Net amortization	0.8	0.8	0.8
Net periodic cost (income)	$ 10.7	$ 10.8	$ 9.8