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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
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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

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