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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Major components of net realized capital gains (losses) on investments    
Fixed maturities, available-for-sale: Gross gains $ 2.1 $ 17.8
Fixed maturities, available-for-sale: Gross losses (12.1) (28.0)
Fixed maturities, available-for-sale: Net credit recoveries (losses) (3.3) (7.7)
Fixed maturities, available-for-sale: Hedging, net (4.1) (1.2)
Fixed maturities, trading 1.6 (0.5)
Equity securities 63.2 (15.6)
Mortgage loans gains (losses) (16.3) (2.7)
Derivative net realized capital gains (losses) (34.9) (42.9)
Other gains (losses) 2.9 14.8
Net realized capital gains (losses) [1] (0.9) (66.0)
Unrealized gains (losses) on fixed maturities, trading 1.7 (1.8)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets (3.0) (2.8)
Unrealized gains (losses) on fixed maturities, trading still head at reported in market risk benefit remeasurement (gain) loss 0.6 1.8
Unrealized gains (losses) on equity securities 58.9 (13.7)
Unrealized gains (losses) on equity securities reported in net investment income 18.7 (0.6)
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets 0.0 1.7
Proceeds from sales of investments    
Proceeds from sales of investments in fixed maturities, available-for-sale $ 912.5 $ 1,639.0
[1] Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.