CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue
Net earned premium	$ 86.6	$ 50.6	$ 231.3	$ 109.2
Ceding commission income	16.7	16.9	51.4	46.4
Net investment income	7.0	2.6	17.6	4.7
Commission and other income	4.2	3.9	14.0	8.0
Total revenue	114.5	74.0	314.3	168.3
Expense
Loss and loss adjustment expense, net	75.9	53.3	215.4	105.8
Other insurance expense	15.1	12.1	43.7	30.9
Sales and marketing	24.4	35.8	77.4	111.1
Technology development	21.8	21.4	67.7	56.1
General and administrative	36.9	40.5	100.3	91.1
Total expense	174.1	163.1	504.5	395.0
Loss before income taxes	(59.6)	(89.1)	(190.2)	(226.7)
Income tax expense	1.9	2.3	4.3	7.4
Net loss	(61.5)	(91.4)	(194.5)	(234.1)
Other comprehensive loss, net of tax
Unrealized gain (loss) on investments in fixed maturities	2.9	(5.0)	10.1	(23.8)
Foreign currency translation adjustment	(1.0)	(1.5)	(1.6)	(8.1)
Comprehensive loss	$ (59.6)	$ (97.9)	$ (186.0)	$ (266.0)
Per share data:
Net loss per share attributable to common stockholders—basic (usd per share)	$ (0.88)	$ (1.37)	$ (2.80)	$ (3.69)
Net loss per share attributable to common stockholders—diluted (usd per share)	$ (0.88)	$ (1.37)	$ (2.80)	$ (3.69)
Weighted average common shares outstanding—basic (in shares)	69,753,576	66,877,100	69,542,342	63,482,945
Weighted average common shares outstanding—diluted (in shares)	69,753,576	66,877,100	69,542,342	63,482,945