Property and Equipment, Net - Schedule of Property, Plant and Equipment Net (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 57.1	$ 15.1
Less: Accumulated depreciation	(7.2)	(3.6)
Total property and equipment, net	49.9	11.5
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	6.5	1.5
Computer hardware
Property, Plant and Equipment [Line Items]
Total property and equipment	5.2	4.5
Computer software
Property, Plant and Equipment [Line Items]
Total property and equipment	0.9	0.7
Website design
Property, Plant and Equipment [Line Items]
Total property and equipment	0.8	0.7
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	29.6	2.9
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 14.1	$ 4.8