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Total net investment income and net realized and unrealized investment gains - Net Realized Investment Losses on Other Long-Term Investments (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Net Investment Income [Line Items] |  |
Net realized investment losses on Other long-term investments | $ (5.4) | $ (3.7)
Other long-term investments |  |
Net Investment Income [Line Items] |  |
Net realized investment losses on Other long-term investments | (2.1) | (0.8)
Hedge funds and private equity funds |  |
Net Investment Income [Line Items] |  |
Net realized investment losses on Other long-term investments | (1.3) | 1.0
Strategic investments |  |
Net Investment Income [Line Items] |  |
Net realized investment losses on Other long-term investments | $ (0.8) | $ (1.8)

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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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