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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
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