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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Major components of net realized capital gains (losses) on investments |  |  |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 8.4 | $ 20.0 | $ 49.1 | $ 26.0
Fixed maturities, available-for-sale: Gross losses |  | (17.7) | (50.7) | (92.5) | (163.3)
Fixed maturities, available-for-sale: Net credit recoveries (losses) |  | 1.0 | 4.3 | (19.8) | (5.8)
Fixed maturities, available-for-sale: Hedging, net |  | (1.7) |  | (2.3) | (0.7)
Fixed maturities, trading |  | (6.4) | (12.3) | (11.6) | (21.8)
Equity securities |  | 29.6 | (37.1) | 32.3 | (187.5)
Mortgage loans gains (losses) |  | (8.1) | (2.5) | (82.4) | (19.3)
Derivative net realized capital gains (losses) |  | 91.2 | 74.2 | 54.8 | 178.7
Other gains (losses) |  | 83.0 | (23.3) | 112.9 | (159.7)
Net realized capital gains (losses) | [1] | 179.3 | (27.4) | 40.5 | (353.4)
Unrealized gains (losses) on fixed maturities, trading |  | (6.6) | (5.8) | (13.0) | (12.0)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets |  | (4.9) | 0.0 | (6.7) | 0.0
Unrealized gains (losses) on fixed maturities, trading still head at reported in market risk benefit remeasurement (gain) loss |  | (1.1) | (4.3) | 0.1 | (17.3)
Unrealized gains (losses) on equity securities |  | 33.0 | (37.1) | 40.6 | (184.0)
Unrealized gains (losses) on equity securities reported in net investment income |  | (2.0) | (7.2) | 4.3 | (17.7)
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets |  | 0.0 | 0.0 | 1.7 | 0.0
Proceeds from sales of investments |  |  |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 755.4 | $ 2,989.7 | $ 3,852.5 | $ 10,531.0
[1] | Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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