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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

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