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Investments - Net Investment (Losses) Gains By Transaction Type (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
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Credit loss impairments | $ (1.3) | $ 0.0 | $ (2.2) | $ (1.1)
Intent-to-sell impairments | (0.5) | 0.0 | (1.4) | (2.1)
Total impairments on investments recognized in net income | (1.8) | 0.0 | (3.6) | (3.2)
Sales and other, net | (1.1) | 1.6 | 0.0 | (0.5)
Change in fair value - equity securities | (12.6) | 4.3 | (29.7) | 1.5
Change in fair value and gains (losses) realized on settlements - derivatives | 0.0 | (1.0) | 2.3 | (1.9)
Net investment gains (losses) | $ (15.5) | $ 4.9 | $ (31.0) | $ (4.1)

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- Definition Other than Temporary Impairment Losses, Investments, Portion Recognized In Earnings, Change In Intent + References No definition available. + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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