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Investments - Realized Investment Gains (Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Gain (Loss) on Securities [Line Items] |  |  |
Net investment losses | $ (56.5) | $ (11.0) | $ (2.3)
Fixed maturity securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net investment losses | (29.1) | (7.7) | 9.4
Equity securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net investment losses | (32.6) | (0.8) | 1.8
Short-term and other investments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net investment losses | $ 5.2 | $ (2.5) | $ (13.5)

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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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