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Fair Value of Financial Assets and Liabilities - Balances of Contingent Consideration (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair Value Disclosures [Abstract]            
Accrued expenses and other current liabilities $ 3.1   $ 4.5      
Other non-current liabilities 23.5   16.4      
Total contingent consideration $ 26.6 $ 26.9 $ 20.9 $ 18.8 $ 17.6 $ 14.0