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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Major components of net realized capital gains (losses) on investments |  |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 51.4 | $ 41.5 | $ 64.4
Fixed maturities, available-for-sale: Gross losses |  | (141.7) | (191.5) | (29.2)
Fixed maturities, available-for-sale: Net credit recoveries (losses) |  | (26.2) | (8.9) | (45.0)
Fixed maturities, available-for-sale: Hedging, net |  | 2.2 | (0.7) | (9.5)
Fixed maturities, trading |  | (8.6) | (13.4) | (33.3)
Equity securities |  | 64.0 | (171.9) | 100.0
Mortgage loans gains (losses) |  | (134.5) | (74.6) | 6.5
Derivative net realized capital gains (losses) |  | (34.1) | 237.0 | (4.0)
Other gains (losses) |  | 155.3 | 0.4 | 65.5
Net realized capital gains (losses) | [1] | (72.2) | (182.1) | 115.4
Unrealized gains (losses) on fixed maturities, trading |  | (9.6) | (3.2) | (32.2)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets |  | 6.8 | (1.4) | 0.0
Unrealized gains (losses) on fixed maturities, trading still head at reported in market risk benefit remeasurement (gain) loss |  | 2.9 | (16.6) | 0.0
Unrealized gains (losses) on equity securities |  | 73.4 | (117.1) | 58.6
Unrealized gains (losses) on equity securities reported in net investment income |  | 34.7 | (0.7) | 28.7
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets |  | 1.7 | (1.7) | 0.0
Proceeds from sales of investments |  |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 5,392.7 | $ 13,647.0 | $ 2,110.9
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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