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Acquisitions - Summary of Changes in Contingent Consideration Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Changes In Contingent Consideration Measured At Fair Value On A Recurring Basis [Roll Forward] |  |  |  |
Opening balance | $ 26.9 | $ 17.6 | $ 20.9 | $ 14.0
Acquisitions and measurement period adjustments | (0.3) | 4.0 | 7.1 | 12.8
Payments | (0.4) | (3.3) | (2.7) | (9.1)
Changes in fair value included in net loss | 0.4 | 0.5 | 1.3 | 1.1
Closing balance | $ 26.6 | $ 18.8 | $ 26.6 | $ 18.8

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