CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - UNAUDITED - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues:
Net premiums earned	$ 279.3	$ 100.0	$ 771.2	$ 223.9
Net investment income	8.0	9.0	27.2	22.5
Fee income	17.1	6.2	48.4	13.2
Other income	1.3	0.1	3.0	0.6
Total revenues	305.7	115.3	849.8	260.2
Operating expenses:
Loss and loss adjustment expenses	184.5	85.8	541.2	208.6
Sales and marketing	34.0	13.1	98.6	22.8
Other insurance expense	22.4	18.3	75.1	22.2
Technology and development	12.9	11.1	38.6	32.4
General and administrative	17.5	21.0	52.7	63.2
Total operating expenses	271.3	149.3	806.2	349.2
Operating income (loss)	34.4	(34.0)	43.6	(89.0)
Interest expense	(11.6)	(11.8)	(34.8)	(34.4)
Income (loss) before income tax expense	22.8	(45.8)	8.8	(123.4)
Income tax expense	0.0	0.0	0.0	0.0
Net income (loss)	22.8	(45.8)	8.8	(123.4)
Less: Undistributed income allocated to participating securities	(1.1)	0.0	(0.5)	0.0
Net income (loss) attributable to common shareholders	21.7	(45.8)	8.3	(123.4)
Other comprehensive income (loss):
Changes in net unrealized gains (losses) on investments	5.5	(0.7)	4.6	(0.8)
Comprehensive income (loss)	$ 28.3	$ (46.5)	$ 13.4	$ (124.2)
Earnings (loss) per common share: basic (both Class A and B) (in dollars per share)	$ 1.45	$ (3.16)	$ 0.56	$ (8.57)
Earnings (loss) per common share: diluted (both Class A and B) (in dollars per share)	$ 1.35	$ (3.16)	$ 0.52	$ (8.57)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares)	15.0	14.5	14.8	14.4
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares)	16.9	14.5	16.8	14.4