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Nature of Business and Significant Accounting Policies (Additional Information) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 25, 2025
USD ($)
shares
Jun. 18, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
Number
$ / shares
shares
Sep. 30, 2024
USD ($)
Number
Sep. 30, 2025
USD ($)
Number
$ / shares
shares
Sep. 30, 2024
USD ($)
Number
Dec. 31, 2024
USD ($)
Number
$ / shares
shares
Aug. 26, 2025
USD ($)
Jul. 18, 2025
$ / shares
Subsidiary, Sale of Stock [Line Items]                  
Common Stock, Shares Authorized     1,500,000,000   1,500,000,000   1,500,000,000    
Common stock, Par value | $ / shares     $ 0.01   $ 0.01   $ 0.01    
Common stock, Shares issued     124,241,773   124,241,773   56,224,168    
Common stock, Shares outstanding     124,241,773   124,241,773   56,224,168    
Preferred stock, Shares authorized     150,000,000   150,000,000   150,000,000    
Preferred stock, Par value | $ / shares     $ 0.01   $ 0.01   $ 0.01    
Preferred stock, Shares issued     0   0   51,374,125    
Preferred stock, Shares outstanding     0   0   51,374,125    
Common stock, Sale of Stock, Number of Shares Issued in Transaction   7,300,000              
Public Offering price | $ / shares                 $ 0.01
Number Of Policies Assumed | Number     13,711 0 40,082 64,600 136,000    
Annualized Gross Premiums | $     $ 463,394 $ 346,293 $ 1,177,027 $ 939,257 $ 484,100    
Assumed Premiums Written | $     $ 33,100 $ 0 138,000 207,600      
Proceeds from issuance of common stock | $         $ 1,012 $ 0      
Common Stock [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Common Stock, Shares Authorized   1,500,000,000 1,500,000,000   1,500,000,000   40,000,000    
Common stock, Par value | $ / shares   $ 0.01 $ 0.01   $ 0.01   $ 0.01    
Common stock, Shares issued             10,200,000    
Common stock, Shares outstanding             10,200,000    
Share Repurchase Program, Authorized, Amount | $     $ 20,000   $ 20,000     $ 75,000  
Share Repurchase Program, Authorized, Number of Shares     1,406,712   1,406,712        
Preferred Stock [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Preferred stock, Shares authorized   150,000,000 150,000,000   150,000,000   20,000,000    
Preferred stock, Par value | $ / shares   $ 0.01 $ 0.01   $ 0.01   $ 0.01    
Preferred stock, Shares issued             9,300,000    
Preferred stock, Shares outstanding             9,300,000    
IPO [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Common stock, Shares issued 3,600,000 24,000,000              
Common stock, Sale of Stock, Number of Shares Issued in Transaction   16,700,000              
Public Offering price | $ / shares   $ 17              
Gross proceeds from sale of equity | $ $ 469,200 $ 408,000              
Proceeds net of underwriting dicsounts received | $   263,500              
Proceeds of commissions received | $   19,800              
Proceeds from issuance of common stock | $   $ 0              
IPO [Member] | Common Stock [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Common stock, Sale of Stock, Number of Shares Issued in Transaction   24,000,000              
Stockholders [Member] | IPO [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Common stock, Sale of Stock, Number of Shares Issued in Transaction   7,300,000              
FLOIR [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Number Of Policies Assumed | Number     15,000 0 281,150 110,000 275,600