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Personnel expenses and employee information - Total Number of Payroll and Temporary Personnel Employed in FTE's Per Sector (Details) - employee
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Personnel Employed Per Sector [Line Items]      
Average number of payroll employees employed (in FTEs) 43,267 41,697 38,805
Payroll employees (in FTEs) 44,209 44,027 42,416
Customer Support and Sales      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 10,235 10,344 10,790
Manufacturing and Supply Chain Management      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 11,124 11,341 9,954
Strategic Supply Management      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 1,929 1,965 2,033
General and Administrative      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 4,473 4,385 4,035
Research and Development      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 16,448 15,992 15,604
Temporary FTEs      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 689 1,241 2,107
Payroll FTEs      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 43,520 42,786 40,309
Netherlands      
Personnel Employed Per Sector [Line Items]      
Average number of payroll employees employed (in FTEs) 22,801 21,811 19,876