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Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2021
Jul. 01, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Effects of Reinsurance [Line Items]              
Favorable (unfavorable) development on net loss and LAE reserves       $ (0.3) $ 1.3 $ (0.1) $ (1.5)
Current accident year incurred loss and LAE       47.3 $ 44.1 $ 54.8 $ 47.3
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% 75.00%        
Ceded commission percentage   25.00%   25.00%      
Claims funding percentage   75.00%   75.00%      
Non-Proportional Reinsurance Contracts              
Effects of Reinsurance [Line Items]              
Percent of contracts subject to participation through reinsurance   25.00%   25.00%