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Description of Business and Summary of Significant Accounting Policies - Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Accounting Policies [Abstract] |  |  |  |
Amortized deferred acquisition costs | $ 14.4 | $ 10.0 | $ 26.1 | $ 17.5

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