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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Major components of net realized capital gains (losses) on investments    
Fixed maturities, available-for-sale: Gross gains $ 17.8 $ 165.8
Fixed maturities, available-for-sale: Gross losses (28.0) (120.7)
Fixed maturities, available-for-sale: Net credit losses (7.7) (6.1)
Fixed maturities, available-for-sale: Hedging, net (1.2) (0.7)
Fixed maturities, trading (0.5) (6.3)
Equity securities (15.6) (105.2)
Mortgage loans gains (losses) (2.7) (19.6)
Derivative net realized capital gains (losses) (42.9) 8.4
Other gains (losses) 14.8 (52.2)
Net realized capital gains (losses) [1] (66.0) (136.6)
Unrealized gains (losses) on fixed maturities, trading (1.8) (5.2)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets (2.8) 0.0
Unrealized gains (losses) on fixed maturities, trading still head at reported in market risk benefit remeasurement (gain) loss 1.8 (7.9)
Unrealized gains (losses) on equity securities (13.7) (105.5)
Unrealized gains (losses) on equity securities reported in net investment income (0.6) (19.3)
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets 1.7 0.0
Proceeds from sales of investments    
Proceeds from sales of investments in fixed maturities, available-for-sale $ 1,639.0 $ 4,859.7
[1] Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.