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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Major components of net realized capital gains (losses) on investments |  |  |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 4.8 | $ 2.1 | $ 5.6 | $ 4.2
Fixed maturities, available-for-sale: Gross losses |  | (23.5) | (26.9) | (53.8) | (39.0)
Fixed maturities, available-for-sale: Net credit recoveries (losses) |  | (3.8) | (0.6) | (8.8) | (3.9)
Fixed maturities, available-for-sale: Hedging, net |  | 14.5 | (1.6) | 22.3 | (5.7)
Fixed maturities, trading |  | (1.2) | (3.9) | (3.0) | (2.3)
Equity securities |  | 75.4 | 7.9 | 38.4 | 71.1
Mortgage loans gains (losses) |  | (16.6) | (31.1) | (17.1) | (47.4)
Derivative net realized capital gains (losses) |  | (86.4) | 39.5 | (71.2) | 4.6
Other gains (losses) |  | 42.2 | (0.6) | (24.1) | 2.3
Net realized capital gains (losses) | [1] | 5.4 | (15.2) | (111.7) | (16.1)
Unrealized gains (losses) on fixed maturities, trading |  | (1.3) | (3.7) | (1.1) | (2.6)
Unrealized gains (losses) on fixed maturities, trading still held at reported in market risk benefit remeasurement (gain) loss |  | 3.0 | 0.2 | 5.8 | 0.8
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets |  | (10.2) | 0.5 | (10.4) | (2.3)
Unrealized gains (losses) on equity securities |  | 2.4 | 5.7 | (26.6) | 63.3
Unrealized gains (losses) on equity securities reported in net investment income |  | 19.0 | (6.1) | 28.2 | 12.6
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets |  | 0.0 | 0.0 | 0.0 | 0.0
Proceeds from sales of investments |  |  |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 829.1 | $ 795.4 | $ 1,593.9 | $ 1,707.9
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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