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Investments - Net Investment Gains (Losses) by Transaction Type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Credit loss impairments | $ (0.9) | $ 0.9 | $ (0.9) | $ 0.0
Intent-to-sell impairments | (2.2) | 0.0 | (2.2) | 0.0
Total impairments | (3.1) | 0.9 | (3.1) | 0.0
Sales and other, net | 2.0 | (3.2) | 4.1 | (3.3)
Change in fair value - equity securities | (0.7) | (2.1) | (1.9) | 0.5
Change in fair value and gains (losses) realized on settlements - derivatives | (4.1) | (1.5) | (8.3) | (0.9)
Net investment gains (losses) | $ (5.9) | $ (5.9) | $ (9.2) | $ (3.7)

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-21 + Details
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