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Defined Benefit Plans - Amounts in Accumulated Other Comprehensive loss that have not yet been Recognized as Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Recognition of actuarial gain $ 0.5 $ 1.2 $ (0.8)
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Recognition of actuarial gain 0.5 155.9  
Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Recognition of actuarial gain 1.3 1.2  
Other Accumulated Other Comprehensive Income | Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Beginning Balance 49.7 32.4  
Recognition of actuarial gain 0.0 0.3  
Current year actuarial loss (gain) (12.5) 17.0  
Net actuarial (loss) due to settlement (2.0)    
Ending Balance 35.2 49.7 32.4
Other Accumulated Other Comprehensive Income | Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Beginning Balance (0.5) (0.4)  
Recognition of actuarial gain 2.6 1.0  
Current year actuarial loss (gain) (1.5) (1.1)  
Net actuarial (loss) due to settlement 0.0    
Ending Balance $ 0.6 $ (0.5) $ (0.4)