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Investments - Net Realized Capital Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Major components of net realized capital gains (losses) on investments        
Fixed maturities, available-for-sale: Gross gains $ 20.0 $ 13.0 $ 26.0 $ 61.2
Fixed maturities, available-for-sale: Gross losses (50.7) (0.9) (163.3) (29.0)
Fixed maturities, available-for-sale: Net credit losses 4.3 (9.6) (5.8) (27.4)
Fixed maturities, available-for-sale: Hedging, net     (0.7) (1.0)
Fixed maturities, trading (16.6) (4.0) (39.1) (28.7)
Equity securities (37.1) 31.2 (187.5) 85.5
Mortgage loans gains (losses) (2.5) 2.6 (19.3) 14.2
Derivative net realized capital gains (losses) 50.2 (173.7) 155.3 (153.9)
Other gains (losses) (23.3) (10.6) (159.7) 37.4
Net realized capital gains (losses) [1] (55.7) (152.0) (394.1) (41.7)
Unrealized gains (losses) on fixed maturities, trading (10.1) (4.0) (29.3) (27.6)
Unrealized gains (losses) on equity securities (37.1) 21.5 (184.0) 54.0
Unrealized gains (losses) on equity securities reported in net investment income (7.2) 3.7 (17.7) 9.6
Proceeds from sales of investments        
Proceeds from sales of investments in fixed maturities, available-for-sale $ 2,989.7 $ 273.6 $ 10,531.0 $ 1,870.7
[1] Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.