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Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
Jul. 01, 2021
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Effects of Reinsurance [Line Items]        
Favorable (unfavorable) development on net loss and LAE reserves     $ (0.3) $ 1.3
Current accident year incurred loss and LAE     47.3 $ 44.1
Reinsurance program, minimum losses threshold     60.0  
Winter Storm Uri        
Effects of Reinsurance [Line Items]        
Current accident year incurred loss and LAE     $ 6.9  
Proportional Reinsurance Contracts        
Effects of Reinsurance [Line Items]        
Percent of contracts subject to participation through reinsurance 70.00% 75.00%    
Ceded commission percentage     25.00%  
Claims funding percentage     75.00%  
Non-Proportional Reinsurance Contracts        
Effects of Reinsurance [Line Items]        
Percent of contracts subject to participation through reinsurance     25.00%