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Financial risk management - Interest rate Sensitivity (Details)
€ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Derivative [Line Items]    
Increase of interest rates (in percentage) 0.0100  
Impact on equity    
Derivative [Line Items]    
Sensitivity analysis, impact of 1 percent point increase in interest rates € 0.0 € 0.0
Impact on net income    
Derivative [Line Items]    
Sensitivity analysis, impact of 1 percent point increase in interest rates € 106.7 € 94.9