CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue
Net earned premium	$ 76.5	$ 31.2	$ 144.7	$ 58.6
Ceding commission income	17.5	15.5	34.7	29.5
Net investment income	5.6	1.2	10.6	2.1
Commission and other income	5.0	2.1	9.8	4.1
Total revenue	104.6	50.0	199.8	94.3
Expense
Loss and loss adjustment expense, net	75.9	28.1	139.5	52.5
Other insurance expense	15.0	9.7	28.6	18.8
Sales and marketing	24.8	37.0	53.0	75.3
Technology development	24.1	17.8	45.9	34.7
General and administrative	30.7	22.4	63.4	50.6
Total expense	170.5	115.0	330.4	231.9
Loss before income taxes	(65.9)	(65.0)	(130.6)	(137.6)
Income tax expense	1.3	2.9	2.4	5.1
Net loss	(67.2)	(67.9)	(133.0)	(142.7)
Other comprehensive loss, net of tax
Unrealized gain (loss) on investments in fixed maturities	1.2	(4.5)	7.2	(18.8)
Foreign currency translation adjustment	0.1	(5.5)	(0.6)	(6.6)
Comprehensive loss	$ (65.9)	$ (77.9)	$ (126.4)	$ (168.1)
Per share data:
Net loss per share attributable to common stockholders—basic (usd per share)	$ (0.97)	$ (1.10)	$ (1.92)	$ (2.31)
Net loss per share attributable to common stockholders—diluted (usd per share)	$ (0.97)	$ (1.10)	$ (1.92)	$ (2.31)
Weighted average common shares outstanding—basic (in shares)	69,534,731	61,816,225	69,434,971	61,757,722
Weighted average common shares outstanding—diluted (in shares)	69,534,731	61,816,225	69,434,971	61,757,722