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Financial risk management - Foreign Currency Sensitivity Analysis (Detail) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro € 74.5 € 48.7
Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (8.0) (21.4)
US dollar | Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 78.3 65.3
US dollar | Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 4.2 (7.2)
Japanese yen | Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (3.8) (16.6)
Japanese yen | Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (2.6) (0.1)
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 0.4 (12.8)
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 € (10.0) € (1.3)