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Reserve for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Unusual Risk or Uncertainty [Line Items]          
Liability incurred for claims and claim adjustment expenses $ 909 $ 1,872      
Prior year claims and claims adjustment expense (131,227) (15,667)      
Reserve for losses and LAE, for prior years 249,400 338,300      
Benefit recorded in provision for losses 101,200        
Reserve for losses and LAE $ 293,072 $ 411,123   $ 407,445 $ 374,941
COVID-19          
Unusual Risk or Uncertainty [Line Items]          
Reserve rate 4.00%   7.00%    
Reserve for losses and LAE $ 136,900        
Percent change used in calculation of expense 1.00%        
Effect of percentage point decrease on liability claim and claim expense adjustment expense $ 35,000