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Basis of Presentation and Significant Accounting Policies - Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 336.3 | $ 330.6 | [1]
Property & Casualty |  |  |
Segment Reporting Information [Line Items] |  |  |
Deferred policy acquisition costs | 29.3 | 24.5 |
Life & Retirement |  |  |
Segment Reporting Information [Line Items] |  |  |
Deferred policy acquisition costs | 297.7 | 299.5 |
Supplemental & Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Deferred policy acquisition costs | $ 9.3 | $ 6.6 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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