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Reinsurance and Catastrophes - Effects of Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Gross Amount |  |  |  |
Premiums written and contract deposits, Gross Amount | $ 1,650.9 | $ 1,583.6 | $ 1,499.0 |
Premiums and contract charges earned, Gross Amount | 1,188.8 | 1,097.7 | 1,046.7 |
Benefits, claims and settlement expenses, Gross Amount | 748.3 | 803.6 | 772.5 |
Ceded to Other Companies |  |  |  |
Premiums written and contract deposits, Ceded to Other Companies | 72.0 | 67.9 | 62.9 |
Premiums and contract charges earned, Ceded to Other Companies | 70.9 | 76.3 | 72.0 |
Benefits, claims and settlement expenses, Ceded to Other Companies | 43.0 | 45.7 | 43.5 |
Assumed from Other Companies |  |  |  |
Premiums written and contract deposits, Assumed from Other Companies | 28.8 | 36.9 | 53.0 |
Premiums and contract charges earned, Assumed from Other Companies | 28.1 | 35.7 | 53.0 |
Benefits, claims and settlement expenses, Assumed from Other Companies | 39.7 | 11.2 | 18.0 |
Net Amount |  |  |  |
Premiums written and contract deposits, Net Amount | 1,607.7 | 1,552.6 | 1,489.1 |
Premiums and contract charges earned, Net Amount | 1,146.0 | 1,057.1 | 1,027.7 |
Benefits, claims and settlement expenses | $ 745.0 | $ 769.1 | $ 747.0 | [1]
[1] | Recast for the adoption of ASU 2018-12.

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- Definition Insurance premiums and contract charges assumed and earned by another insurer as a result of reinsurance arrangements. + References No definition available. + Details
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- Definition Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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