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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

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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