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Reinsurance (Summary of Reinsurance Activity) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Insurance [Abstract]    
Net assumed written premiums $ 25.6 $ 31.2
Net premiums earned 23.5 21.9
Provision for claims 16.1 17.0
Amortization of capitalized acquisition costs $ 0.6 $ 0.6