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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | $ 46.9 | $ 37.6 | $ 56.9
Realized Investment Losses |  |  |  |  |  |  |  |  | (5.0) | (11.2) | (1.0)
Net Gains on Trading Securities |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.6
Net Realized Gains on Sales of Investments | $ 2.8 | $ 1.7 | $ 21.3 | $ 16.1 | $ 16.4 | $ 3.6 | $ 3.8 | $ 2.6 | 41.9 | 26.4 | 56.5
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |
Fixed Maturities: |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 41.1 | 25.3 | 8.4
Losses on Sales |  |  |  |  |  |  |  |  | (4.8) | (11.1) | (0.9)
Equity Securities |  |  |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 5.8 | 12.3 | 42.0
Losses on Sales |  |  |  |  |  |  |  |  | (0.2) | 0.0 | 0.0
Real Estate |  |  |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 6.4
Other |  |  |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.1
Realized Investment Losses |  |  |  |  |  |  |  |  | $ 0.0 | $ (0.1) | $ (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 (loss) on investment in debt and equity securities. + 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=118939692&loc=d3e27357-111563 + 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 http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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