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Business Combinations and Asset Acquisitions - Summary of Changes in Contingent Consideration Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Combinations [Abstract] |  |  |
Opening balance | $ 39.8 | $ 16.4 | $ 19.6
Acquisitions | 5.6 | 20.0 | 7.4
Fair value (gains) losses included in net loss | (4.7) | 8.9 | (9.9)
Payments | (16.3) | (5.5) | (0.7)
Closing Balance | $ 24.4 | $ 39.8 | $ 16.4

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