Acquisition of Metromile - Additional Information (Details) - Metromile $ in Millions		2 Months Ended	3 Months Ended		9 Months Ended
	Jul. 28, 2022 shares	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Business Acquisition [Line Items]
Percent of equity acquired	100.00%
Conversion ratio	0.05263
Shares issued for acquisition (in shares) | shares	6,901,934
Business acquisition, pro forma revenue		$ 15.1	$ 85.1	$ 64.2	$ 221.1	$ 159.1
Net loss		$ 20.7	(112.2)	$ (90.6)	(316.8)	$ (344.7)
Transaction expenses			$ 7.4		$ 8.4