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Reinsurance - Unsecured Reinsurance Recoverable by Reinsurer (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | $ 153.4 | $ 170.4
Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 103.9 | 173.3
Lloyd's Underwriter Syndicate no. 2791 MAP | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 1.2 | 2.1
Lloyd's Underwriter Syndicate no. 1084 CSL | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 0.7 | 1.1
Top Reinsurers | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 103.7 | 172.9
Other reinsurers | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 0.2 | 0.4
A+ | Hannover Rueck SE | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 48.9 | 104.0
A+ | Swiss Reinsurance America Corporation | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 13.2 | 26.3
A+ | Aviva Insurance Limited | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 8.9 | 2.7
A+ | Odyssey Reinsurance Company | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 0.1 | 0.2
A+ | Lloyd's Underwriter Syndicate No. 2001 AML | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 0.1 | 0.2
A | MAPFRE Re, Compania De Reaseguros S.A. | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 29.3 | 34.0
A++ | Tokio Marine & Nichido Fire Insurance Company Limited | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | 1.2 | 1.9
A++ | The Travellers Indemnity Company | Ceded Credit Risk, Unsecured |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverable | $ 0.1 | $ 0.4

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477363/944-310-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477409/944-310-45-6 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-15 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477409/944-310-45-5 + Details
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