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Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 25 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 28, 2023 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) Reinsurer | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Ceded unpaid loss |  |  |  | $ 125.1 | $ 826.2 | $ 125.1 |  |
Prepaid reinsurance premiums |  |  |  | 461.5 | 393.2 | 461.5 |  |
Increase (decrease) in loss and loss adjustment expense reserve |  |  |  | 0.0 | 0.0 |  |  |
Reinsurance recoverable |  |  |  | 125.2 | 831.0 | 125.2 |  |
Premium net written |  |  |  | 61.1 | 38.3 |  |  |
Net earned premiums |  |  |  | 27.7 | 26.4 |  |  |
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | 131.5 | 841.1 | 131.5 |  |
Hurricane Ian |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Reinsurance recoverable |  |  |  | 0.1 |  | 0.1 |  |
Reinsurance recoverable for net expected loss |  |  |  | 3.8 |  | 3.8 |  |
Loss reserve inclusive of IBNR claims |  |  |  | 3.9 |  | 3.9 |  |
Reported insured losses |  |  |  | $ 1.9 |  | $ 1.9 |  |
Wright National Flood Insurance Company |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Ceded rate of premiums under insurance program |  |  |  | 100.00% |  | 100.00% |  |
Prepaid reinsurance premiums |  |  |  | $ 460.9 | 381.8 | $ 460.9 |  |
Expenses and allowance rate received in premiums |  |  |  | 29.50% |  | 29.50% |  | 29.70%
Reserve for losses and loss adjustment expense |  |  |  | $ 125.1 | 826.2 | $ 125.1 |  |
Number of reinsurers | Reinsurer |  |  |  | 2 |  |  |  |
Premiums written net |  |  |  | $ 886.5 | 740.9 |  |  |
Statutory capital and surplus required |  |  |  | 7.5 |  | 7.5 |  |
Statutory capital and surplus |  |  |  | 39.1 | 31.8 | $ 39.1 |  |
Statutory net Income |  |  |  | $ 7.5 | 1.3 |  |  |
Percentage of adjusted net income |  |  |  | 100.00% |  | 100.00% |  |
Maximum dividend payout that may be made without prior approval |  |  |  | $ 3.2 |  | $ 3.2 |  |
Dividend paid | $ 3.1 |  |  |  |  |  |  |
Wright National Flood Insurance Company | Scenario Forecast |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Maximum dividend payout that may be made without prior approval |  |  |  |  |  |  | $ 7.5 |
Wright National Flood Insurance Company | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 10.00% |  |  |  |
Wright National Flood Insurance Company | FEMA |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Premiums written net |  |  |  | $ 883.4 | 738.0 |  |  |
Quota Share Captive |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Prepaid reinsurance premiums |  |  |  | 0.6 |  | 0.6 |  |
Deferred acquisitions costs |  |  |  | 31.0 |  | 31.0 |  |
Reserve for losses and loss adjustment expense |  |  |  | 4.0 |  | 4.0 |  |
Premium net written |  |  |  | 57.6 |  |  |  |
Premiums written net |  |  |  | 52.1 | 27.1 |  |  |
Net earned premiums |  |  |  | 24.2 |  |  |  |
Initial funding |  | $ 5.9 |  |  |  |  |  |
Addition to current earnings |  |  |  |  |  | 2.5 |  |
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | 7.2 |  | 7.2 |  |
Captive Insurance Facility |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Net earned premiums |  |  |  | 3.5 | 5.8 |  |  |
Maximum Underwriting Exposure |  |  | $ 3.0 |  |  |  |  |
Captive Insurance Facility | Hurricane Ian |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |
Reserve for losses and loss adjustment expense |  |  |  | $ 2.3 | $ 4.5 | $ 2.3 |  |

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