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Financial risk management - Financial Assets and Liabilities Fair Value disclosure (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments € 33.6 € 96.5
Money market funds 6,222.2 6,379.2
Short-term investments 405.9 5.4
Total 6,661.7 6,481.1
Derivative financial instruments 93.0 113.6
Loans receivable 1,848.9 1,339.4
Long-term debt 3,590.8 4,561.8
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 0.0 0.0
Money market funds 6,222.2 6,379.2
Short-term investments 0.0 0.0
Total 6,222.2 6,379.2
Derivative financial instruments 0.0 0.0
Loans receivable 0.0 0.0
Long-term debt 3,590.8 4,561.8
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 33.6 96.5
Money market funds 0.0 0.0
Short-term investments 405.9 5.4
Total 439.5 101.9
Derivative financial instruments 93.0 113.6
Loans receivable 0.0 0.0
Long-term debt 0.0 0.0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments 0.0 0.0
Money market funds 0.0 0.0
Short-term investments 0.0 0.0
Total 0.0 0.0
Derivative financial instruments 0.0 0.0
Loans receivable 1,848.9 1,339.4
Long-term debt € 0.0 € 0.0