v3.26.3
Unpaid Loss and Loss Adjustment Expense - Activity in the Liability for Unpaid Loss and LAE (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Unpaid loss and LAE at beginning of period     $ 303.1 $ 298.1
Less: Reinsurance recoverable at beginning of period     133.8 149.5
Net unpaid loss and LAE at beginning of period     169.3 148.6
Add: Incurred loss and LAE, net of reinsurance, related to:        
Current year     495.1 271.4
Prior years     (20.4) (18.9)
Total incurred $ 187.4 $ 89.6 474.7 252.5
Deduct: Paid loss and LAE, net of reinsurance, related to:        
Current year     350.4 171.2
Prior years     71.1 65.9
Total paid     421.5 237.1
Unpaid loss and LAE, net of reinsurance recoverable, at end of period 222.5 164.0 222.5 164.0
Reinsurance recoverable at end of period 98.7 148.1 98.7 148.1
Unpaid loss and LAE, gross of reinsurance recoverable, at end of period $ 321.2 $ 312.1 $ 321.2 $ 312.1