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Segment Information - Pre-tax income (loss) from exited business (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pre-tax income (loss) from exited business:      
Change in fair value of funds withheld embedded derivative $ 447.4 $ (1,085.7) $ 3,652.8
Net realized capital gains (losses) on funds withheld assets [1] 87.7 165.0 749.4
Amortization of reinsurance gain (loss) (631.6) (17.7) (19.3)
Reconciling items      
Pre-tax income (loss) from exited business:      
Change in fair value of funds withheld embedded derivative 447.4 (1,085.7) 3,652.8
Net realized capital gains (losses) on funds withheld assets 87.7 165.0 749.4
Strategic review costs and impacts on pre-tax income (loss)     40.4
Amortization of reinsurance gain (loss) (589.6) (68.7) (56.7)
Other impacts of reinsured business 137.9 (140.4) (125.8)
Total pre-tax income (loss) from exited business 83.4 (1,129.8) 4,260.1
Total income tax expense (benefit) related to exited business $ 17.6 $ (238.1) $ 956.4
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.