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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 27, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Business Acquisition [Line Items]          
Total revenues   $ 1,465.8 $ 1,365.9 $ 4,352.3 $ 4,091.2
Battea Class Action Services [Member]          
Business Acquisition [Line Items]          
Outstanding stock purchased $ 671.0        
Total revenues       $ 4.1  
Battea Class Action Services [Member] | Customer Relationships Member          
Business Acquisition [Line Items]          
Estimated life of assets 13 years        
Battea Class Action Services [Member] | Completed Technologies Member          
Business Acquisition [Line Items]          
Estimated life of assets 11 years        
Battea Class Action Services [Member] | Trade Names Member          
Business Acquisition [Line Items]          
Estimated life of assets 13 years