v3.26.1
Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]      
Total revenue $ 258.0 $ 151.2  
less: Loss and loss adjustment expenses, net 133.3 85.4  
Other insurance expense 24.1 26.1  
Sales and marketing 66.1 43.2  
Technology development 26.9 22.0  
Income tax expense 1.2 1.0  
Net loss (35.8) (62.4)  
Reportable Segment      
Segment Reporting Information [Line Items]      
Total revenue 258.0 151.2  
less: Loss and loss adjustment expenses, net 133.3 85.4  
Other insurance expense 24.1 26.1  
Sales and marketing 11.8 5.1  
Advertising expenses 54.3 38.1  
Technology development 26.9 22.0  
General and administrative 35.0 28.1  
Interest expense 6.2 3.3  
Depreciation and amortization 2.7 4.5  
Other expenses (1.7) 0.0  
Income tax expense 1.2 1.0  
Net loss $ (35.8) $ (62.4)  
Other expenses     $ (1.7)