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Total net investment income and net realized and unrealized investment gains - Net Investment Income and Total Realized and Unrealized Investment Gains (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Net Investment Income [Line Items] |  |
Investment expenses | $ (5.3) | $ (3.9)
Net investment income and net realized and unrealized investment gains (losses) | 70.9 | 79.8
Debt securities, available for sale |  |
Net Investment Income [Line Items] |  |
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents | 58.8 | 63.7
Debt securities, trading |  |
Net Investment Income [Line Items] |  |
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents | 3.5 | 8.8
Short-term investments |  |
Net Investment Income [Line Items] |  |
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents | 1.1 | 4.4
Other long-term investments |  |
Net Investment Income [Line Items] |  |
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents | 2.5 | 0.5
Derivative instruments |  |
Net Investment Income [Line Items] |  |
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents | (0.2) | 1.3
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents |  |
Net Investment Income [Line Items] |  |
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents | 65.7 | 78.7
Net investment income on cash and cash equivalents |  |
Net Investment Income [Line Items] |  |
Net investment income and net realized and unrealized investment gains (losses) before other investment expenses and investment income on cash and cash equivalents | $ 10.5 | $ 5.0

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