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Reinsurance - Unsecured Reinsurance Recoverable and Prepaid Reinsurance Premium Balances (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | $ 371.4 | $ 356.0
Other reinsurers |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 143.1 | 160.3
A+ |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 228.3 | 195.7
A+ | Munich Reinsurance America, Inc. |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 60.0 | 34.3
A+ | Hannover Rück SE |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 56.9 | 49.9
A+ | Everest Reinsurance Company |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 41.6 | 55.3
A+ | Digital Advantage Insurance Company |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 24.1 | 19.4
A+ | Swiss Reinsurance America Corporation |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 18.3 | 14.0
A+ | Partner Reinsurance Company of the U.S. |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | 14.9 | 15.0
A+ | Sirius America Insurance Company |  |
Ceded Credit Risk [Line Items] |  |
Unsecured reinsurance recoverable and prepaid reinsurance premium | $ 12.5 | $ 7.8

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + 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 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479616/944-310-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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