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Segment Information - Revenues from exited business (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues from exited business:        
Change in fair value of funds withheld embedded derivative $ (265.9) $ (776.8) $ (455.3) $ (346.9)
Net realized capital gains (losses) on funds withheld assets [1] (0.2) 39.4 31.5 105.9
Reconciling items        
Revenues from exited business:        
Change in fair value of funds withheld embedded derivative (265.9) (776.8) (455.3) (346.9)
Net realized capital gains (losses) on funds withheld assets (0.2) 39.4 31.5 105.9
Amortization of reinsurance gain 0.5 0.6 1.6 2.7
Other impacts of exited business (5.7) (4.2) (21.2) (15.6)
Total revenues from exited business $ (271.3) $ (741.0) $ (443.4) $ (253.9)
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.