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Reinsurance for the Reciprocal - Narrative (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2026 | Apr. 01, 2025 | Jul. 31, 2026 | Mar. 31, 2026
Reinsurance Property Catastrophe Treaties |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Excess amount retained | $ 365.0 |  |  | $ 410.0
Reinsurance Property Catastrophe Treaties | Variable Interest Entity, Primary Beneficiary | Subsequent Event |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Amount retained |  |  | $ 100.0 |
Excess amount retained |  |  | $ 365.0 |
Reinsurance Property Catastrophe Treaties | Minimum |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Amount retained | $ 35.0 |  |  | $ 25.0
Reinsurance Property Catastrophe Treaties | Maximum |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Amount retained |  | $ 23.1 |  |
Reinsurance Quota Share Program |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Reinsured risk percentage |  | 7.50% |  |
Non-Catastrophic Weather Quota Share |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Reinsurance contract, term |  | 10 years |  |

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- Definition Amount per event of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
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