Acquisition of Metromile - Additional Information (Details) $ in Millions		3 Months Ended	12 Months Ended
	Jul. 28, 2022 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Amortization expense			$ 9.6	$ 5.3	$ 5.3
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
Results of operations for acquiree, revenue			69.9	35.0
Results of operations for acquiree, net gain (loss)			$ (27.2)	(36.4)
Transaction expenses		$ 8.4
Acquired intangible assets	$ 35.5
Metromile Insurance Company | Acquisition-related Costs
Business Acquisition [Line Items]
Acquired intangible assets				2.0
Business acquisition, transaction costs		$ 10.0		10.0
Deferred revenue, increase (decrease)				(4.9)
Amortization expense				1.3
Income taxes, increase				0.6
Metromile Insurance Company | Acquisition-related Costs | ASU 2016-02
Business Acquisition [Line Items]
Income taxes, increase				$ 2.0