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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Major components of net realized capital gains (losses) on investments |  |  |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 20.0 | $ 13.0 | $ 26.0 | $ 61.2
Fixed maturities, available-for-sale: Gross losses |  | (50.7) | (0.9) | (163.3) | (29.0)
Fixed maturities, available-for-sale: Net credit losses |  | 4.3 | (9.6) | (5.8) | (27.4)
Fixed maturities, available-for-sale: Hedging, net |  |  |  | (0.7) | (1.0)
Fixed maturities, trading |  | (16.6) | (4.0) | (39.1) | (28.7)
Equity securities |  | (37.1) | 31.2 | (187.5) | 85.5
Mortgage loans gains (losses) |  | (2.5) | 2.6 | (19.3) | 14.2
Derivative net realized capital gains (losses) |  | 50.2 | (173.7) | 155.3 | (153.9)
Other gains (losses) |  | (23.3) | (10.6) | (159.7) | 37.4
Net realized capital gains (losses) | [1] | (55.7) | (152.0) | (394.1) | (41.7)
Unrealized gains (losses) on fixed maturities, trading |  | (10.1) | (4.0) | (29.3) | (27.6)
Unrealized gains (losses) on equity securities |  | (37.1) | 21.5 | (184.0) | 54.0
Unrealized gains (losses) on equity securities reported in net investment income |  | (7.2) | 3.7 | (17.7) | 9.6
Proceeds from sales of investments |  |  |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 2,989.7 | $ 273.6 | $ 10,531.0 | $ 1,870.7
[1] | Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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