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Acquisitions - Summary of Unaudited Pro Forma Information (Detail) - Battea Class Action Services [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Business Acquisition [Line Items]        
Revenues $ 1,472.6 $ 1,413.8 $ 4,359.1 $ 4,139.1
Net income $ 159.0 $ 170.2 $ 491.9 $ 398.6