Retirement and Other Employee Benefits - Reconciliation of Benefit Obligations, Plan Assets and Funded Status for Defined Benefit Pension Plans and Post-Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Change in Plan Assets:
Beginning fair value	$ 13.9
Ending fair value		$ 13.9
Amounts recognized in Accumulated other comprehensive loss:
Net gains occurring during the year	5.1	5.7
United States | Pension plans
Change in Benefit Obligation:
Beginning benefit obligation	16.7	17.0
Service cost	0.0	0.0	$ 0.0
Interest cost	0.5	0.6	0.7
Actuarial (gain) loss	(0.7)	0.5
Benefits paid	(1.3)	(1.4)
Exchange rate changes	0.0	0.0
Plan amendment	0.0	0.0
Ending benefit obligation	15.2	16.7	17.0
Change in Plan Assets:
Beginning fair value	13.9	13.1
Actual return on plan assets	(0.9)	1.8
Company contributions	0.2	0.4
Benefits paid	(1.3)	(1.4)
Exchange rate changes	0.0	0.0
Ending fair value	11.9	13.9	13.1
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	0.0	0.0
Retirement benefits liability (noncurrent liability)	3.2	2.8
Net amount recognized in the Consolidated Balance Sheets	3.2	2.8
Amounts recognized in Accumulated other comprehensive loss:
Net actuarial loss	(9.4)	(8.7)
Net amount recognized in accumulated other comprehensive loss	(9.4)	(8.7)	(9.4)
Net gains occurring during the year	1.1	(0.3)
United Kingdom | Pension plans
Change in Benefit Obligation:
Beginning benefit obligation	64.6	57.0
Service cost	0.0	0.0	0.0
Interest cost	1.5	1.5	1.9
Actuarial (gain) loss	(3.0)	2.9
Benefits paid	(2.3)	(2.0)
Exchange rate changes	(3.8)	5.5
Plan amendment	1.4	(0.3)
Ending benefit obligation	58.4	64.6	57.0
Change in Plan Assets:
Beginning fair value	61.3	50.5
Actual return on plan assets	(5.0)	5.9
Company contributions	1.8	1.8
Benefits paid	(2.3)	(2.0)
Exchange rate changes	(3.5)	5.1
Ending fair value	52.3	61.3	50.5
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	0.0	0.0
Retirement benefits liability (noncurrent liability)	6.0	3.3
Net amount recognized in the Consolidated Balance Sheets	6.0	3.3
Amounts recognized in Accumulated other comprehensive loss:
Net actuarial loss	(7.7)	(1.7)
Net amount recognized in accumulated other comprehensive loss	(7.7)	(1.7)	(2.8)
Net gains occurring during the year	5.7	(1.0)
Central America | Post-retirement plans
Change in Benefit Obligation:
Beginning benefit obligation	67.1	61.9
Service cost	5.9	5.6	5.2
Interest cost	4.0	4.4	3.8
Actuarial (gain) loss	(6.6)	0.4
Benefits paid	(5.7)	(6.0)
Exchange rate changes	(3.5)	0.8
Plan amendment	0.0	0.0
Ending benefit obligation	61.2	67.1	61.9
Change in Plan Assets:
Beginning fair value	0.0	0.0
Actual return on plan assets	0.0	0.0
Company contributions	5.7	6.0
Benefits paid	(5.7)	(6.0)
Exchange rate changes	0.0	0.0
Ending fair value	0.0	0.0	0.0
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	8.1	7.5
Retirement benefits liability (noncurrent liability)	53.1	59.6
Net amount recognized in the Consolidated Balance Sheets	61.2	67.1
Amounts recognized in Accumulated other comprehensive loss:
Net actuarial loss	(6.4)	(14.2)
Net amount recognized in accumulated other comprehensive loss	(6.4)	(14.2)	$ (14.6)
Net gains occurring during the year	$ (6.6)	$ 0.5