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Segment disclosure - Net Sales and Long-Lived Assets by Geographic Region (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Total net sales € 32,667.3 € 28,262.9 € 27,558.5
Long-lived assets 8,234.8 7,234.0 5,799.8
Japan      
Segment Reporting Information [Line Items]      
Total net sales 1,420.9 1,156.0 613.6
Long-lived assets 20.9 16.0 10.4
South Korea      
Segment Reporting Information [Line Items]      
Total net sales 8,159.6 6,408.8 6,949.2
Long-lived assets 348.7 241.6 148.1
Singapore      
Segment Reporting Information [Line Items]      
Total net sales 608.4 285.0 282.1
Long-lived assets 8.4 4.3 5.0
Taiwan      
Segment Reporting Information [Line Items]      
Total net sales 8,337.9 4,354.0 8,074.6
Long-lived assets 531.7 473.8 354.5
China      
Segment Reporting Information [Line Items]      
Total net sales 9,519.7 10,195.1 7,251.8
Long-lived assets 70.9 72.7 48.6
Rest of Asia      
Segment Reporting Information [Line Items]      
Total net sales 2.7 3.5 3.9
Long-lived assets 1.8 0.1 0.2
Netherlands      
Segment Reporting Information [Line Items]      
Total net sales 4.7 16.6 25.1
Long-lived assets 5,342.4 4,621.4 3,783.6
EMEA      
Segment Reporting Information [Line Items]      
Total net sales 524.3 1,322.1 1,206.8
Long-lived assets 529.6 443.1 314.5
United States      
Segment Reporting Information [Line Items]      
Total net sales 4,089.1 4,521.8 3,151.4
Long-lived assets € 1,380.4 € 1,361.0 € 1,134.9