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Variable and voting interest entities - Total Assets and Maximum Exposure to Loss for Unconsolidated Variable Interest Entities (Details) - Variable Interest Entity, Not Primary Beneficiary, Excluding Investments In Related Party Investment Funds - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Variable Interest Entity [Line Items] |  |
Carrying Amount | $ 227.8 | $ 223.8
Maximum Exposure to Loss | 343.2 | 346.5
Debt securities |  |
Variable Interest Entity [Line Items] |  |
Carrying Amount | 27.5 | 21.1
Maximum Exposure to Loss | 79.5 | 79.3
Other long-term investments |  |
Variable Interest Entity [Line Items] |  |
Carrying Amount | 200.3 | 202.7
Maximum Exposure to Loss | $ 263.7 | $ 267.2

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