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Defined Benefit Plans - Obligations and Funded Status (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in the Projected Benefit Obligation (PBO):      
Recognition of actuarial losses (gains) $ (0.5) $ (1.2) $ 0.8
Change in Plan Assets:      
Beginning balance 482.5    
Ending balance 468.0 482.5  
Pension Benefits [Member]      
Change in the Projected Benefit Obligation (PBO):      
Projected benefit obligation at beginning of year 543.6 712.0  
Service cost 0.1 0.2  
Interest cost 27.2 20.4  
Recognition of actuarial losses (gains) (0.5) (155.9)  
Benefits paid (60.7) (33.1)  
Projected benefit obligation at end of year 509.7 543.6 712.0
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases) 509.7 543.6  
Change in Plan Assets:      
Beginning balance 482.5 649.8  
Actual return on plan assets 40.5 (144.8)  
Employer contributions 5.7 10.6  
Benefits paid (60.7) (33.1)  
Ending balance 468.0 482.5 649.8
Funded status (Fair value of plan assets less PBO) (41.7) (61.1)  
Postretirement Benefits [Member]      
Change in the Projected Benefit Obligation (PBO):      
Projected benefit obligation at beginning of year 9.0 9.8  
Service cost 0.4 0.4  
Interest cost 0.5 0.4  
Recognition of actuarial losses (gains) (1.3) (1.2)  
Benefits paid (0.6) (0.4)  
Projected benefit obligation at end of year 8.0 9.0 $ 9.8
Change in Plan Assets:      
Employer contributions 0.6 0.4  
Benefits paid (0.6) (0.4)  
Funded status (Fair value of plan assets less PBO) $ (8.0) $ (9.0)