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Property and Equipment, Net - Summary of Property Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 242.4 $ 218.9
Less: accumulated depreciation (85.0) (77.2)
Property and equipment, net 157.4 141.7
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 158.2 144.1
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 31.9 29.0
Computer software and internally-developed software [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 28.1 23.8
Computer equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 24.2 $ 22.0