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Basis of Presentation and Significant Accounting Policies - Schedule of Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | $ 347.2 | $ 336.3
Property & Casualty |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 34.4 | 29.3
Life & Retirement |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | 301.4 | 297.7
Supplemental & Group Benefits |  |
Segment Reporting Information [Line Items] |  |
Deferred policy acquisition costs | $ 11.4 | $ 9.3

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