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v3.25.3

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 |  |

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