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Fair value measurement - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
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 $ 3.3
Fair Value, Measurements, Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Assets held for sale $ 1.5 $ 0.2