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Postretirement Plans - Schedule of Change in Projected Benefit Obligation and Plan Assets (Detail) - U.S. Postretirement Health Care Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 35.8 $ 37.3  
Interest cost 1.8 1.9 $ 1.2
Plan participant contributions 0.1 0.2  
Benefits paid (3.6) (3.3)  
Actuarial gain (0.6) (0.3)  
Benefit obligation at end of year 33.5 35.8 37.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 11.4 11.2  
Return on plan assets 1.0 1.0  
Employer contributions 2.7 2.3  
Plan participant contributions 0.1 0.2  
Benefits paid (3.6) (3.3)  
Fair value of plan assets at end of year 11.6 11.4 $ 11.2
Unfunded status at end of year $ (21.9) $ (24.4)