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Reinsurance (Summary of Reinsurance Activity) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Insurance [Abstract] |  |  |  |
Net assumed written premiums | $ 24.1 | $ 23.7 | $ 52.1 | $ 49.3
Net premiums earned | 24.6 | 24.1 | 47.8 | 47.6
Provision for claims | 18.1 | 19.8 | 33.9 | 35.9
Amortization of capitalized acquisition costs | $ 0.7 | $ 0.7 | $ 1.3 | $ 1.3

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