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, 2017	Dec. 30, 2016	Jan. 01, 2016
Pension plans | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	0.6	0.7	0.7
Expected return on assets	(1.0)	(1.0)	(1.0)
Net amortization	0.4	0.3	0.4
Net periodic cost (income)	0.0	0.0	0.1
Pension plans | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0
Interest cost	1.5	1.9	2.2
Expected return on assets	(2.4)	(2.6)	(2.9)
Net amortization	0.0	0.0	0.0
Net periodic cost (income)	(0.9)	(0.7)	(0.7)
Post-retirement plans | Central America
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.6	5.2	5.8
Interest cost	4.4	3.8	3.7
Expected return on assets	0.0	0.0	0.0
Net amortization	0.8	0.8	1.1
Net periodic cost (income)	$ 10.8	$ 9.8	$ 10.6