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Other Current Assets and Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Agent equity program $ 84.8 $ 0.0
Accrued compensation 67.4 46.5
Accrued other acquisition related compensation, current 23.6 1.3
Contingent consideration, current 12.9 19.1
Other 52.2 39.9
Accrued expenses and other current liabilities $ 240.9 $ 106.8