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Investments - Net Investment Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Gain (Loss) on Securities |  |  |  |
Net investment losses | $ (12.8) | $ (6.5) | $ (43.8) | $ (10.6)
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment losses | (10.7) | (4.0) | (15.9) | (7.9)
Equity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment losses | (4.4) | (1.0) | (32.5) | 0.7
Short-term investments and other |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment losses | $ 2.3 | $ (1.5) | $ 4.6 | $ (3.4)

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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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