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Financial risk management - Foreign Currency Sensitivity Analysis (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income € (1.6) € (38.5)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity 95.6 80.9
US dollar    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income 1.1 10.3
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity 88.2 81.3
Japanese yen    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income (23.2) (30.4)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity 7.4 (0.4)
Taiwanese dollar    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income (2.3) (7.9)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity 0.0 0.0
South Korean won    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income 21.8 (11.4)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity 0.0 0.0
Chinese yuan    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income (1.2) 1.7
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity 0.0 0.0
Other currencies    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income 2.2 (0.8)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity € 0.0 € 0.0