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Fair value measurement - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Assets held for sale	$ 3.7	$ 1.5
Hedge funds redemption period	60 days
Hedge funds redemption potential holdback percentage	5.00%
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Unfunded commitments related to partnership/joint venture interests	$ 3.1	$ 3.1

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- Definition

Fair value portion of assets classified as held for sale.

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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.

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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The percentage of the total value of investments that cannot be redeemed because of a redemption restriction as of the statement of financial position date.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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