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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Major components of net realized capital gains (losses) on investments |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 0.8 | $ 2.1
Fixed maturities, available-for-sale: Gross losses |  | (30.3) | (12.1)
Fixed maturities, available-for-sale: Net credit recoveries (losses) |  | (5.0) | (3.3)
Fixed maturities, available-for-sale: Hedging, net |  | 7.8 | (4.1)
Fixed maturities, trading |  | (1.8) | 1.6
Equity securities |  | (37.0) | 63.2
Mortgage loans gains (losses) |  | (0.5) | (16.3)
Derivative net realized capital gains (losses) |  | 15.2 | (34.9)
Other gains (losses) |  | (66.3) | 2.9
Net realized capital gains (losses) | [1] | (117.1) | (0.9)
Unrealized gains (losses) on fixed maturities, trading |  | (0.1) | 1.7
Unrealized gains (losses) on fixed maturities, trading still held at reported in market risk benefit remeasurement (gain) loss |  | 2.8 | 0.6
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets |  | (0.2) | (3.0)
Unrealized gains (losses) on equity securities |  | (36.4) | 58.9
Unrealized gains (losses) on equity securities reported in net investment income |  | 9.2 | 18.7
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets |  | 0.0 | 0.0
Proceeds from sales of investments |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 764.8 | $ 912.5
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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