Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation and amortization	$ (312.0)	$ (379.0)
Total property and equipment, net	121.0	157.0
Depreciable Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	433.0	536.0
Computer software and capitalized internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	164.0	175.0
Total property and equipment, net	8.6	21.0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	152.0	214.0
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	32.0	57.0
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23.0	43.0
Buildings and land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17.0	17.0
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 45.0	$ 30.0

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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