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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 28, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value $ 177.1 $ 468.0
Fair value excluding investments measured at net asset value    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value 26.4 26.8
Investments Measured at Net Asset Value    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value 150.7 441.2
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value 2.6 17.5
Cash and cash equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value 2.6  
Group annuity/insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value   26.8
Group annuity/insurance contracts | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value   26.8
Other investments    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value [1] 23.8  
Other investments | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value [1] 23.8  
Equity    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value 27.3 121.2
Fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value 95.1 267.2
Multi-strategy hedge funds    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value 12.1 16.3
Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Total plan asstes at fair value $ 16.2 $ 19.0
[1]

(a) - Other investments consist of future contracts on U.S. Treasury notes and bonds primarily used to hedge interest rate exposures.