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Short-Term Duration Insurance Contracts - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Group Benefits |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Favorable development of total reserves for claims occurring in prior years | $ 4.9 | $ 1.9

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