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Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2022
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Effects of Reinsurance [Line Items]          
Favorable development on net loss and LAE reserves   $ 5.7 $ (0.4)    
Current accident year incurred loss and LAE   57.9 $ 24.8    
Reinsurance program, minimum losses threshold   $ 80.0      
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% 70.00%
Hurricane Ian          
Effects of Reinsurance [Line Items]          
Current accident year incurred loss and LAE   $ 0.3      
Winter Storm Elliot          
Effects of Reinsurance [Line Items]          
Current accident year incurred loss and LAE   9.6      
Tornados In Southeast          
Effects of Reinsurance [Line Items]          
Current accident year incurred loss and LAE   $ 0.9