CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - UNAUDITED - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues:
Net premiums earned	$ 321.3	$ 230.3
Net investment income	8.7	9.2
Fee income	18.7	14.7
Other income	0.7	0.7
Total revenues	349.4	254.9
Operating expenses:
Loss and loss adjustment expenses	205.6	166.4
Sales and marketing	51.5	30.4
Other insurance expense	36.7	24.6
Technology and development	11.4	11.0
General and administrative	20.5	17.1
Total operating expenses	325.7	249.5
Operating income	23.7	5.4
Interest expense	(5.3)	(11.6)
Income (loss) before income tax expense	18.4	(6.2)
Income tax expense	0.0	0.0
Net income (loss)	18.4	(6.2)
Net income attributable to participating securities	(0.9)	0.0
Net income (loss) attributable to common shareholders	17.5	(6.2)
Other comprehensive income (loss):
Net income (loss)	18.4	(6.2)
Changes in net unrealized gains (losses) on investments	3.0	(0.8)
Comprehensive income (loss)	$ 21.4	$ (7.0)
Earnings (loss) per common share: basic (both Class A and B) (in dollars per share)	$ 1.15	$ (0.42)
Earnings (loss) per common share: diluted (both Class A and B) (in dollars per share)	$ 1.07	$ (0.42)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares)	15.2	14.6
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares)	17.2	14.6