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Operating leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Lessee, Lease, Description [Line Items]        
Total lease cost $ 11,566 $ 11,896 $ 36,694 $ 40,078
Right-of-use assets obtained in exchange for lease obligations $ 2,100 $ 1,700 $ 24,600 $ 37,600
Weighted average remaining lease term 6 years 9 months   6 years 9 months  
Weighted average discount rate 3.15%   3.15%  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities Other Liabilities Other Liabilities
Other liabilities        
Lessee, Lease, Description [Line Items]        
Operating lease liabilities $ 33,900 $ 42,200 $ 33,900 $ 42,200
Selling, general and administration costs        
Lessee, Lease, Description [Line Items]        
Total lease cost     28,100 38,100
Direct costs        
Lessee, Lease, Description [Line Items]        
Total lease cost     $ 8,600 $ 2,000