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Financial risk management - Foreign Currency Sensitivity Analysis (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro € 80.9 € 74.5
Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (38.5) (8.0)
US dollar | Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 81.3 78.3
US dollar | Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 10.3 4.2
Japanese yen | Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (0.4) (3.8)
Japanese yen | Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (30.4) (2.6)
Taiwanese dollar | Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 0.0 0.0
Taiwanese dollar | Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (7.9) 0.4
Other currencies | Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 0.0 0.0
Other currencies | Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro € (10.5) € (10.0)