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Investments - Realized Investment (Losses) Gains (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | $ (15.5) | $ 4.9 | $ (31.0) | $ (4.1)
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | (2.9) | 1.5 | (5.2) | (3.9)
Equity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | (12.6) | 4.4 | (28.1) | 1.7
Short-term investments and other |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | $ 0.0 | $ (1.0) | $ 2.3 | $ (1.9)

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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