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Insurance Company Subsidiary Operations - Additional Information (Details) $ in Millions |  | 1 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 22 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 28, 2023 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) Reinsurer | Dec. 31, 2022 USD ($) | Sep. 30, 2023 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |
Ceded rate of premiums under insurance program |  |  |  | 100.00% |  | 100.00%
Ceded unpaid loss |  |  |  | $ 217.5 |  | $ 217.5
Prepaid reinsurance premiums |  |  |  | 502.7 | $ 393.2 | 502.7
Increase (decrease) in loss and loss adjustment expense reserve |  |  |  | 0.0 |  |
Reinsurance recoverable |  |  |  | 220.1 | 831.0 | 220.1
Reserve for losses and loss adjustment expense |  |  |  | $ 217.5 |  | 217.5
Number of reinsurers | Reinsurer |  |  |  | 2 |  |
Premium net written |  |  |  | $ 39.9 |  |
Net earned premiums |  |  |  | 33.7 |  |
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | 231.7 | 841.1 | 231.7
Hurricane Ian |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |
Reinsurance recoverable |  |  |  | 2.6 |  | 2.6
Reinsurance recoverable for net expected loss |  |  |  | 4.8 |  | 4.8
Loss reserve inclusive of IBNR claims |  |  |  | 7.6 |  | 7.6
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 |  |  |  | $ 475.4 |  | $ 475.4
Expenses and allowance rate received in premiums |  |  |  | 29.70% |  | 29.70%
Premiums written net |  |  |  | $ 681.8 |  |
Ceded to highly rated carriers for excess flood policies |  |  |  | 2.5 |  |
Statutory capital and surplus required |  |  |  | 7.5 |  | $ 7.5
Statutory capital and surplus |  |  |  | 39.0 | 31.8 | $ 39.0
Statutory net Income |  |  |  | $ 8.1 | $ 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 | 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 |  |  |  | $ 679.3 |  |
Quota Share Captive |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |
Prepaid reinsurance premiums |  |  |  | 27.4 |  | 27.4
Deferred acquisitions costs |  |  |  | 29.7 |  | 29.7
Reserve for losses and loss adjustment expense |  |  |  | 8.2 |  | 8.2
Premiums written net |  |  |  | 46.3 |  |
Premium net written |  |  |  | 37.4 |  |
Net earned premiums |  |  |  | 31.2 |  |
Initial funding |  | $ 5.9 |  |  |  |
Addition to current earnings |  |  |  |  |  | 16.1
Ultimate loss reserve expense inclusive of IBNR claims |  |  |  | 9.8 |  | 9.8
Captive Insurance Facility |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |
Reserve for losses and loss adjustment expense |  |  |  | 6.0 |  | 6.0
Net earned premiums |  |  |  | 2.5 |  |
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 |  |  |  | $ 5.4 |  | $ 5.4

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- Definition Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479989/944-505-50-1 + Details
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