v3.25.2
Loss and Loss Adjustment Expense Reserves - LAE Reserve Activity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Loss and LAE incurred relating to:        
Net incurred loss and LAE $ 166.5 $ 183.9 $ 428.3 $ 369.7
P&C Insurance and Reinsurance (Ark/WM Outrigger)        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross beginning balance 2,253.9 1,744.5 2,127.5 1,605.1
Less: beginning reinsurance recoverable on unpaid losses (480.6) (404.5) (434.4) (340.8)
Net loss and LAE reserves 1,773.3 1,340.0 1,693.1 1,264.3
Loss and LAE incurred relating to:        
Current year losses 181.1 182.6 467.4 362.9
Prior year losses (17.1) (6.9) (69.9) (7.2)
Net incurred loss and LAE 164.0 175.7 397.5 355.7
Loss and LAE paid relating to:        
Current year losses (29.5) (4.3) (112.7) (8.3)
Prior year losses (104.0) (78.8) (179.8) (175.5)
Net paid loss and LAE (133.5) (83.1) (292.5) (183.8)
Foreign currency translation and other adjustments to loss and LAE reserves 16.2 (1.0) 21.9 (4.6)
Net ending balance 1,820.0 1,431.6 1,820.0 1,431.6
Plus: ending reinsurance recoverable on unpaid losses (468.5) (458.5) (468.5) (458.5)
Gross ending balance $ 2,288.5 $ 1,890.1 $ 2,288.5 $ 1,890.1