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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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