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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Major components of net realized capital gains (losses) on investments |  |
Fixed maturities, available-for-sale: Gross gains | $ 37.0 | $ 23.1
Fixed maturities, available-for-sale: Gross losses | (5.1) | (4.2)
Fixed maturities, available-for-sale: Net credit loss | (4.4) | (7.9)
Fixed maturities, available-for-sale: Hedging, net |  | (1.5)
Fixed maturities, trading | (14.1) | (16.4)
Equity securities | 16.2 | (63.7)
Mortgage loans gains (losses) | 4.7 | (15.7)
Derivative net realized capital gains (losses) | 113.6 | 290.5
Other gains (losses) | 3.5 | (72.8)
Net realized capital gains (losses) | 151.4 | 131.4
Unrealized gains (losses) on fixed maturities, trading | (14.0) | (14.2)
Unrealized gains (losses) on equity securities | 7.4 | (66.0)
Unrealized gains (losses) on equity securities reported in net investment income | 5.2 | (38.5)
Proceeds from sales of investments |  |
Proceeds from sales of investments in fixed maturities, available-for-sale | $ 554.2 | $ 541.6

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- Definition Amount of gain (loss) included in earnings on loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
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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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- Definition Amount of cash inflow from sale of 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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