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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Major components of net realized capital gains (losses) on investments |  |  |
Fixed maturities, available-for-sale: Gross gains |  | $ 165.8 | $ 37.0
Fixed maturities, available-for-sale: Gross losses |  | (120.7) | (5.1)
Fixed maturities, available-for-sale: Net credit recoveries (losses) |  | (6.1) | (4.4)
Fixed maturities, available-for-sale: Hedging, net |  | (0.7) |
Fixed maturities, trading |  | (14.2) | (14.1)
Equity securities |  | (105.2) | 16.2
Mortgage loans gains (losses) |  | (19.6) | 4.7
Derivative net realized capital gains (losses) |  | 42.4 | 113.6
Other gains (losses) |  | (52.2) | 3.5
Net realized capital gains (losses) | [1] | (110.5) | 151.4
Unrealized gains (losses) on fixed maturities, trading |  | (13.1) | (14.0)
Unrealized gains (losses) on equity securities |  | (105.5) | 7.4
Unrealized gains (losses) on equity securities reported in net investment income |  | (19.3) | 5.2
Proceeds from sales of investments |  |  |
Proceeds from sales of investments in fixed maturities, available-for-sale |  | $ 4,859.7 | $ 554.2
[1] | Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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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 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=123581744&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=124260329&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=123570139&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=123570139&loc=d3e3179-108585 + Details
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