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Reinsurance (Summary of Reinsurance Activity) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Insurance [Abstract]        
Net assumed written premiums $ 25.7 $ 22.6 $ 84.2 $ 71.5
Net premiums earned 25.1 20.8 71.3 58.0
Provision for claims 18.5 16.5 55.8 54.1
Amortization of capitalized acquisition costs $ 0.6 $ 0.3 $ 1.8 $ 1.3