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Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 16 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Mar. 31, 2023 USD ($) Reinsurer | Dec. 31, 2022 USD ($) | Mar. 31, 2023 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Ceded rate of premiums under insurance program |  | 100.00% |  | 100.00%
Ceded unpaid loss |  | $ 139.2 |  | $ 139.2
Prepaid reinsurance premiums |  | 379.6 | $ 393.2 | 379.6
Increase (decrease) in loss and loss adjustment expense reserve |  | 0.0 |  |
Reinsurance recoverable |  | 142.7 | 831.0 | 142.7
Reserve for losses and loss adjustment expense |  | $ 139.2 |  | 139.2
Number of reinsurers | Reinsurer |  | 2 |  |
Premium net written |  | $ 9.9 |  |
Net earned premiums |  | 10.0 |  |
Ultimate loss reserve expense inclusive of IBNR claims |  | 154.1 | 841.1 | 154.1
Hurricane Ian |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reinsurance recoverable |  | 3.6 |  | 3.6
Reinsurance recoverable for net expected loss |  | 4.2 |  | 4.2
Loss reserve for non-CAT claims |  | 7.8 |  | 7.8
Reported insured losses |  | $ 2.4 |  | $ 2.4
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 |  | $ 359.6 |  | $ 359.6
Expenses and allowance rate received in premiums |  | 29.70% |  | 29.70%
Premiums written net |  | $ 162.4 |  |
Ceded to highly rated carriers for excess flood policies |  | 0.6 |  |
Statutory capital and surplus required |  | 7.5 |  | $ 7.5
Statutory capital and surplus |  | 33.0 | 31.8 | $ 33.0
Statutory net Income |  | $ 0.5 | $ 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
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 |  | $ 161.8 |  |
Quota Share Captive |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Prepaid reinsurance premiums |  | 20.0 |  | 20.0
Deferred acquisitions costs |  | 19.4 |  | 19.4
Reinsurance payable |  | 5.3 |  | 5.3
Reserve for losses and loss adjustment expense |  | 8.6 |  | 8.6
Premiums written net |  | 15.9 |  |
Premium net written |  | 9.0 |  |
Net earned premiums |  | 9.9 |  |
Initial funding | $ 5.9 |  |  |
Addition to current earnings |  |  |  | 8.5
Ultimate loss reserve expense inclusive of IBNR claims |  | 8.6 |  | 8.6
Captive Insurance Facility |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reserve for losses and loss adjustment expense |  | 6.3 |  | 6.3
Net earned premiums |  | 0.9 |  |
Maximum underwriting exposure |  | 5.2 |  |
Captive Insurance Facility | Hurricane Ian |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reserve for losses and loss adjustment expense |  | $ 6.0 |  | $ 6.0

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