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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Changes In Contingent Consideration Measured At Fair Value On A Recurring Basis [Roll Forward] |  |  |  |
Opening balance | $ 18.2 | $ 22.8 | $ 14.0 | $ 24.4
Acquisitions | 0.0 | 3.6 | 8.8 | 3.6
Payments | (1.2) | (4.0) | (5.8) | (6.0)
Changes in fair value included in net loss | 0.6 | (0.7) | 0.6 | (0.3)
Closing balance | $ 17.6 | $ 21.7 | $ 17.6 | $ 21.7

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