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Segment Information - Revenues from exited business (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues from exited business:    
Change in fair value of funds withheld embedded derivative $ (209.7) $ 197.0
Net realized capital gains (losses) on funds withheld assets [1] 28.0 47.5
Reconciling items    
Revenues from exited business:    
Change in fair value of funds withheld embedded derivative (209.7) 197.0
Net realized capital gains (losses) on funds withheld assets 28.0 47.5
Amortization of reinsurance gain 0.5 1.1
Other impacts of exited business (6.8) (3.3)
Total revenues from exited business $ (188.0) $ 242.3
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.