Acquisition of Metromile - Business Combinations and Asset Acquisitions (Details) - Metromile - USD ($) $ in Millions	2 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Total Revenue	$ 15.1	$ 85.1	$ 64.2	$ 221.1	$ 159.1
Net loss	$ 20.7	$ (112.2)	$ (90.6)	$ (316.8)	$ (344.7)