Acquisition of Metromile - Additional Information (Details) $ in Millions		5 Months Ended	12 Months Ended
	Jul. 28, 2022 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Amortization expense			$ 5.3	$ 0.0	$ 0.0
Metromile
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		$ 35.0	309.3	228.4
Net loss		36.4	(383.0)	$ (458.1)
Transaction expenses			8.4
Acquired of intangible assets	$ 35.5
Metromile | Acquisition-related Costs
Business Acquisition [Line Items]
Acquired of intangible assets			2.0
Business acquisition, transaction costs		$ 10.0	10.0
Deferred revenue			4.9
Amortization expense			1.3
Income taxes			0.6
Metromile | Acquisition-related Costs | ASU 2016-02
Business Acquisition [Line Items]
Income taxes			$ 2.0