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Reinsurance (Summary of Reinsurance Activity) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Insurance [Abstract]        
Net assumed written premiums $ 23.1 $ 25.7 $ 72.4 $ 84.2
Net premiums earned 24.1 25.1 71.7 71.3
Provision for claims 18.6 18.5 54.5 55.8
Amortization of capitalized acquisition costs $ 0.5 $ 0.6 $ 1.8 $ 1.8