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Total net investment income and net realized and unrealized investment gains - Net Unrealized 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 unrealized investment losses on Other long-term investments | $ 2.6 | $ 1.3
Hedge funds and private equity funds |  |
Net Investment Income [Line Items] |  |
Net unrealized investment losses on Other long-term investments | 2.0 | (0.6)
Strategic investments |  |
Net Investment Income [Line Items] |  |
Net unrealized investment losses on Other long-term investments | 0.5 | 1.9
Other investments |  |
Net Investment Income [Line Items] |  |
Net unrealized investment losses on Other long-term investments | $ 0.1 | $ 0.0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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(2)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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