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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