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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Major components of net realized capital gains (losses) on investments |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 17.8 | $ 165.8
Fixed maturities, available-for-sale: Gross losses |  | (28.0) | (120.7)
Fixed maturities, available-for-sale: Net credit losses |  | (7.7) | (6.1)
Fixed maturities, available-for-sale: Hedging, net |  | (1.2) | (0.7)
Fixed maturities, trading |  | (0.5) | (6.3)
Equity securities |  | (15.6) | (105.2)
Mortgage loans gains (losses) |  | (2.7) | (19.6)
Derivative net realized capital gains (losses) |  | (42.9) | 8.4
Other gains (losses) |  | 14.8 | (52.2)
Net realized capital gains (losses) | [1] | (66.0) | (136.6)
Unrealized gains (losses) on fixed maturities, trading |  | (1.8) | (5.2)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets |  | (2.8) | 0.0
Unrealized gains (losses) on fixed maturities, trading still head at reported in market risk benefit remeasurement (gain) loss |  | 1.8 | (7.9)
Unrealized gains (losses) on equity securities |  | (13.7) | (105.5)
Unrealized gains (losses) on equity securities reported in net investment income |  | (0.6) | (19.3)
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets |  | 1.7 | 0.0
Proceeds from sales of investments |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 1,639.0 | $ 4,859.7
[1] | Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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