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Total net investment income and net realized and unrealized investment gains - Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |
Gross realized gains | $ 8.9 | $ 5.5
Gross realized losses | (14.3) | (9.2)
Net realized losses on investments | (5.4) | (3.7)
Net unrealized gains on investments | 5.1 | 4.7
Net realized and unrealized gains (losses) on investments | (0.3) | 1.0
Realized and unrealized gains (losses) from related party investments | $ 2.6 | $ (1.9)

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