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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