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Reinsurance and Catastrophes - Total Amounts of Reinsurance Recoverables On Unpaid Insurance Reserves (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance balances receivable | $ 424.2 | $ 462.5
Reinsurance companies |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance balances receivable | 7.4 | 3.1
State insurance facilities |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance balances receivable | 96.6 | 97.7
Group benefits |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance balances receivable | 306.2 | 352.4
Life and health |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance balances receivable | $ 14.0 | $ 9.3

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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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