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Retirement and Other Employee Benefits - Roll Forward of AOCI Balances (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]    
Net (losses) gains occurring during the year $ (5.1) $ (5.7)
Pension plans | United States    
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]    
AOCI (loss) at beginning of plan year (8.7) (9.4)
Amortization of net losses recognized during the year 0.4 0.4
Net (losses) gains occurring during the year (1.1) 0.3
Currency exchange rate changes 0.0 0.0
AOCI (loss) at end of plan year (9.4) (8.7)
Pension plans | United Kingdom    
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]    
AOCI (loss) at beginning of plan year (1.7) (2.8)
Amortization of net losses recognized during the year (0.4) 0.0
Net (losses) gains occurring during the year (5.7) 1.0
Currency exchange rate changes 0.1 0.1
AOCI (loss) at end of plan year (7.7) (1.7)
Post-retirement plans | Central America    
(Decrease) Increase In Accumulated Other Comprehensive Income Loss Before Tax [Roll Forward]    
AOCI (loss) at beginning of plan year (14.2) (14.6)
Amortization of net losses recognized during the year 0.8 0.9
Net (losses) gains occurring during the year 6.6 (0.5)
Currency exchange rate changes 0.4 0.0
AOCI (loss) at end of plan year $ (6.4) $ (14.2)