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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
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

X

- Definition

Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, On-Balance Sheet, Amount

+ References

No definition available.

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

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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

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