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Income from Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Method Investments |  |  |  |  |  |  |  |  | $ (0.4) |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 48.3 | $ 46.9 | $ 37.6
Realized Investment Losses |  |  |  |  |  |  |  |  | (10.2) | (5.0) | (11.2)
Net Realized Gains on Sales of Investments | $ (0.1) | $ 10.0 | $ 11.7 | $ 16.5 | $ 2.8 | $ 1.7 | $ 21.3 | $ 16.1 | 38.1 | 41.9 | 26.4
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 40.6 | 41.1 | 25.3
Losses on Sales |  |  |  |  |  |  |  |  | (7.9) | (4.8) | (11.1)
Equity Securities |  |  |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 5.9 | 5.8 | 12.3
Losses on Sales |  |  |  |  |  |  |  |  | (1.9) | (0.2) | 0.0
Real Estate |  |  |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 1.8 | 0.0 | 0.0
Other |  |  |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Realized Investment Losses |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ (0.1)

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- Definition The net realized losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity + 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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