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Goodwill and other identifiable intangible assets - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets      
Accumulated goodwill impairment losses $ 8.0 $ 8.0  
Identifiable intangible asset amortization expense 0.8 $ 0.8 $ 0.8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity      
2025 0.8    
2026 0.8    
2027 0.8    
2028 0.8    
2029 $ 0.8    
Customer relationships      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity      
Weighted average amortization period 13 years    
Technology and trading related      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity      
Weighted average amortization period 11 years