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Significant Consolidated Balance Sheet Components - Property, Equipment and Software (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property, equipment and software	$ 116.5	$ 82.0
Accumulated depreciation and amortization	(67.4)	(47.1)
Total property, equipment and software—net	49.1	34.9
Capitalized software development costs	34.1	24.2	$ 19.2
Amortization of capitalized software	22.1	16.7	12.5
Depreciation and amortization expense excluding capitalized software	1.9	2.4	1.0
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property, equipment and software	105.7	71.6
Loss on disposal of capitalized software development costs	0.0	(0.8)	$ (0.2)
Office equipment
Property, Plant and Equipment [Line Items]
Total property, equipment and software	6.7	5.3
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, equipment and software	1.8	1.4
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and software	$ 2.3	$ 3.7

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