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. 26, 2025	Dec. 27, 2024	Dec. 29, 2023
Change in Plan Assets:
Beginning fair value	$ 11.3
Ending fair value		$ 11.3
Amounts recognized in Accumulated other comprehensive loss:
Net gains occurring during the year	3.4	2.4
Foreign Plan | Pension plans
Amounts recognized in Accumulated other comprehensive loss:
Net gains occurring during the year	4.6	3.5
United States | Pension plans
Change in Benefit Obligation:
Beginning benefit obligation	10.5	11.2
Service cost	0.0	0.0	$ 0.0
Interest cost	0.5	0.5	0.6
Actuarial loss (gain)	(0.1)	(0.1)
Benefits paid	(1.1)	(1.1)
Exchange rate changes	0.0	0.0
Settlement gain	0.0	0.0
Ending benefit obligation	9.8	10.5	11.2
Change in Plan Assets:
Beginning fair value	11.3	11.4
Actual return on plan assets	1.1	1.1
Company contributions	0.0	0.0
Effect of settlements	0.0	0.0
Benefits paid	(1.0)	(1.2)
Exchange rate changes	0.0	0.0
Ending fair value	11.4	11.3	11.4
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	0.0	0.0
Retirement benefits liability (noncurrent liability)	0.0	0.0
Other noncurrent assets	1.5	0.8
Net amount recognized in the Consolidated Balance Sheets	1.5	0.8
Amounts recognized in Accumulated other comprehensive loss:
Net actuarial (loss) gain	(5.4)	(6.3)
Prior service cost	0.0	0.0
Net amount recognized in accumulated other comprehensive loss	(5.4)	(6.3)	(6.9)
Net gains occurring during the year	(0.5)	(0.3)
United Kingdom | Pension plans
Change in Benefit Obligation:
Beginning benefit obligation	36.8	40.6
Service cost	0.0	0.0	0.0
Interest cost	2.1	1.9	1.8
Actuarial loss (gain)	(1.0)	(2.6)
Benefits paid	(2.6)	(2.6)
Exchange rate changes	2.6	(0.5)
Settlement gain	0.0	0.0
Ending benefit obligation	37.9	36.8	40.6
Change in Plan Assets:
Beginning fair value	39.1	42.2
Actual return on plan assets	1.3	(1.8)
Company contributions	1.9	1.8
Effect of settlements	0.0	0.0
Benefits paid	(2.6)	(2.6)
Exchange rate changes	2.9	(0.5)
Ending fair value	42.6	39.1	42.2
Amounts recognized in the Consolidated Balance Sheets:
Accounts payable and accrued expenses (current liability)	0.0	0.0
Retirement benefits liability (noncurrent liability)	0.0	0.0
Other noncurrent assets	4.7	2.3
Net amount recognized in the Consolidated Balance Sheets	4.7	2.3
Amounts recognized in Accumulated other comprehensive loss:
Net actuarial (loss) gain	(11.7)	(11.0)
Prior service cost	(1.1)	(1.0)
Net amount recognized in accumulated other comprehensive loss	(12.8)	(12.0)	(10.7)
Net gains occurring during the year	0.3	1.6
Central America
Amounts recognized in Accumulated other comprehensive loss:
Net gains occurring during the year	0.1
Central America | Post-retirement plans
Change in Benefit Obligation:
Beginning benefit obligation	75.1	70.2
Service cost	6.6	7.2	6.0
Interest cost	5.1	5.1	5.2
Actuarial loss (gain)	4.6	0.2
Benefits paid	(8.5)	(2.7)
Exchange rate changes	0.8	1.5
Settlement gain	0.0	(6.4)
Ending benefit obligation	83.7	75.1	70.2
Change in Plan Assets:
Beginning fair value	0.0	0.0
Actual return on plan assets	0.0	0.0
Company contributions	8.5	9.1
Effect of settlements	0.0	(6.4)
Benefits paid	(8.5)	(2.7)
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)	(11.3)	(12.6)
Retirement benefits liability (noncurrent liability)	(72.4)	(62.5)
Other noncurrent assets	0.0	0.0
Net amount recognized in the Consolidated Balance Sheets	(83.7)	(75.1)
Amounts recognized in Accumulated other comprehensive loss:
Net actuarial (loss) gain	0.7	5.2
Prior service cost	1.9	2.1
Net amount recognized in accumulated other comprehensive loss	2.6	7.3	$ 8.1
Net gains occurring during the year	$ 4.6	$ 0.3