v3.25.1
Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Percentage of ceded earned premiums to gross earned premiums 42.00% 38.00%
Percentage of assumed earned premiums to net earned premiums 33.00% 24.00%
Fronting    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Gross losses and loss adjustment expenses $ 957.5 $ 603.7