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Fair Value of Financial Assets and Liabilities - Summary of Fair Value Measurements of Our Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |
Accrued expenses and other current liabilities | $ 7.4 | $ 19.1 |  |
Other non-current liabilities | 20.6 | 20.7 |  |
Total contingent consideration | $ 28.0 | $ 39.8 | $ 17.1 | $ 16.4

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