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Stockholders’ Equity - Share-based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 57.5 $ 61.9
Losses and loss adjustment expenses    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1.2 2.6
Insurance related expenses    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 4.9 5.4
Technology and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 12.5 19.2
Sales and marketing    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 13.1 13.7
General and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 25.8 $ 21.0