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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Personnel Employed Per Sector [Line Items]      
Average number of payroll employees employed (in FTEs) 41,697 38,805 33,071
Payroll employees (in FTEs) 44,027 42,416 39,086
Customer Support and Sales      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 10,344 10,790 9,643
Manufacturing and Supply Chain Management      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 11,341 9,954 9,953
Strategic Supply Management      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 1,965 2,033 1,541
General and Administrative      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 4,385 4,035 3,768
Research and Development      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 15,992 15,604 14,181
Temporary FTEs      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 1,241 2,107 2,974
Payroll FTEs      
Personnel Employed Per Sector [Line Items]      
Payroll employees (in FTEs) 42,786 40,309 36,112
Netherlands      
Personnel Employed Per Sector [Line Items]      
Average number of payroll employees employed (in FTEs) 21,811 19,876 16,722