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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Major components of net realized capital gains (losses) on investments |  |  |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 22.9 |  | $ 40.7 | $ 6.0
Fixed maturities, available-for-sale: Gross gains |  |  | $ (159.8) |  |
Fixed maturities, available-for-sale: Gross losses |  | (46.8) | 8.1 | (74.8) | (112.6)
Fixed maturities, available-for-sale: Net credit recoveries (losses) |  | (13.1) | 4.0 | (20.8) | (10.1)
Fixed maturities, available-for-sale: Hedging, net |  | 0.6 |  | (0.6) | (0.7)
Fixed maturities, trading |  | (4.7) | (3.2) | (5.2) | (9.5)
Equity securities |  | 18.3 | (45.2) | 2.7 | (150.4)
Mortgage loans gains (losses) |  | (71.6) | 2.8 | (74.3) | (16.8)
Derivative net realized capital gains (losses) |  | 6.5 | 96.1 | (36.4) | 104.5
Other gains (losses) |  | 15.1 | (84.2) | 29.9 | (136.4)
Net realized capital gains (losses) | [1] | (72.8) | (189.4) | (138.8) | (326.0)
Unrealized gains (losses) on fixed maturities, trading |  | (4.4) | (2.5) | (6.3) | (6.3)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets |  | 0.8 | 0.0 | (1.9) | 0.0
Unrealized gains (losses) on fixed maturities, trading still head at reported in market risk benefit remeasurement (gain) loss |  | (0.7) | (5.1) | 1.1 | (13.0)
Unrealized gains (losses) on equity securities |  | 19.5 | (50.9) | 6.8 | (150.5)
Unrealized gains (losses) on equity securities reported in net investment income |  | 6.9 | 8.8 | 6.3 | (10.5)
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 |  | $ 1,458.1 | $ 2,681.6 | $ 3,097.1 | $ 7,541.3
[1] | Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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