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Total net investment income and net realized and unrealized investment gains - Gains Attributable to Unrealized Investment Gains on Level 3 Investments (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Net Investment Income [Line Items] |  |
Other long-term investments | $ 2.6 | $ 1.3
Level 3 |  |
Net Investment Income [Line Items] |  |
Other long-term investments | $ 1.4 | $ 1.1

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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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