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Financial risk management - Sensitivity Analysis (Detail)
€ in Millions
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Derivative [Line Items]    
Increase of interest rates (in percentage) 0.010  
Decrease of interest rates (in percentage) 0.010  
Equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro € 48.7 € 18.6
Sensitivity analysis, impact of 1 percent point increase in interest rates 0.0 0.0
Net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (21.4) (6.6)
Sensitivity analysis, impact of 1 percent point increase in interest rates 43.8 45.9
US dollar | Equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 65.3 51.5
US dollar | Net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (7.2) (6.9)
Japanese yen | Equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (16.6) (32.9)
Japanese yen | Net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (0.1) (2.2)
Taiwanese dollar | Equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 0.0 0.0
Taiwanese dollar | Net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro (12.8) (3.7)
Other currencies | Equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro 0.0 0.0
Other currencies | Net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro € (1.3) € 6.2