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Total net investment income and net realized and unrealized investment gains - Net Realized Investment Losses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |
Debt securities, available for sale | $ (2.0) | $ (0.3)
Debt securities, trading | (1.5) | (3.4)
Short-term investments | 0.2 | 0.6
Other long-term investments | (2.1) | (0.8)
Net investment income on cash and cash equivalents | 0.0 | 0.2
Net realized losses on investments | $ (5.4) | $ (3.7)

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- Definition Cash And Cash Equivalents, Realized Gain (Loss) + References No definition available. + Details
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- Definition Gain (Loss) on Sale of Other Long-term Investments + References No definition available. + Details
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- Definition Gain (Loss) on Sale of Other Short-term Investments + References No definition available. + Details
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-14 + Details
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