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Basis of Presentation and Significant Accounting Policies - Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Segment Reporting Information |  |
Deferred policy acquisition costs | $ 248.0 | $ 229.8
Property & Casualty |  |
Segment Reporting Information |  |
Deferred policy acquisition costs | 24.4 | 26.1
Supplemental |  |
Segment Reporting Information |  |
Deferred policy acquisition costs | 4.2 | 4.3
Retirement |  |
Segment Reporting Information |  |
Deferred policy acquisition costs | 153.8 | 137.7
Life |  |
Segment Reporting Information |  |
Deferred policy acquisition costs | $ 65.6 | $ 61.7

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