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Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
Jul. 01, 2022
Jun. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Effects of Reinsurance [Line Items]        
Favorable development on net loss and LAE reserves     $ (1.1) $ (0.3)
Current accident year incurred loss and LAE     106.9 47.3
Reinsurance program, minimum losses threshold     $ 80.0  
Reinsurance Contract [Axis]: Non-Proportional Reinsurance Contracts        
Effects of Reinsurance [Line Items]        
Percent of contracts subject to participation through reinsurance     25.00%  
Reinsurance Contract [Axis]: Premiums and Losses to Reinsurers        
Effects of Reinsurance [Line Items]        
Percent of contracts subject to participation through reinsurance     30.00%  
Reinsurance Contract [Axis]: Proportional Reinsurance Contracts        
Effects of Reinsurance [Line Items]        
Percent of contracts subject to participation through reinsurance 55.00% 75.00%    
Ceded commission percentage     25.00%  
Claims funding percentage     75.00%  
Hurricane Ian        
Effects of Reinsurance [Line Items]        
Current accident year incurred loss and LAE     $ 2.2  
Winter Storm Uri        
Effects of Reinsurance [Line Items]        
Current accident year incurred loss and LAE       $ 6.2