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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Major components of net realized capital gains (losses) on investments |  |  |  |
Fixed maturities, available-for-sale: Gross gains | $ 11.2 | $ 83.2 | $ 48.2 | $ 106.3
Fixed maturities, available-for-sale: Gross losses | (23.0) | (21.6) | (28.1) | (25.8)
Fixed maturities, available-for-sale: Net credit recoveries (losses) | (13.4) | (8.3) | (17.8) | (16.2)
Fixed maturities, available-for-sale: Hedging, net | (1.0) | (8.1) | (1.0) | (9.6)
Fixed maturities, trading | (10.6) | 25.1 | (24.7) | 8.7
Equity securities | 38.1 | 39.3 | 54.3 | (24.4)
Mortgage loans gains (losses) | 6.9 | 0.7 | 11.6 | (15.0)
Derivative net realized capital gains (losses) | (93.8) | (195.7) | 19.8 | 94.8
Other gains (losses) | 44.5 | 58.0 | 48.0 | (14.8)
Net realized capital gains (losses) | (41.1) | (27.4) | 110.3 | 104.0
Unrealized gains (losses) on fixed maturities, trading | (9.5) | 24.4 | (23.5) | 10.2
Unrealized gains (losses) on equity securities | 31.0 | 42.3 | 35.1 | (20.7)
Unrealized gains (losses) on equity securities reported in net investment income | 0.7 | 49.0 | 5.9 | 10.5
Proceeds from sales of investments |  |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale | $ 1,042.9 | $ 1,006.0 | $ 1,597.1 | $ 1,547.6

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- Definition Amount of realized gain 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 http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27476-111563 + Details
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