Property and Equipment, net - Schedule of Property and Equipment, net (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 45.8	$ 37.8
Accumulated depreciation	(28.4)	(18.2)
Property and equipment, net	17.4	19.6
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28.6	20.7
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13.0	13.4
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4.2	$ 3.7