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Financial risk management - Financial Assets and Liabilities Fair Value disclosure (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivative [Line Items]    
Derivative financial instruments € 96.5 € 31.1
Short-term investments 5.4 5.4
Derivative financial instruments 113.6 156.7
Fair value, recurring    
Derivative [Line Items]    
Derivative financial instruments 96.5 31.1
Money market funds 6,379.2 3,167.4
Short-term investments 5.4 5.4
Total 6,481.1 3,203.9
Derivative financial instruments 113.6 156.7
Loan receivable 1,339.4 776.1
Long-term debt 4,561.8 4,496.2
Level 1 | Fair value, recurring    
Derivative [Line Items]    
Derivative financial instruments 0.0 0.0
Money market funds 6,379.2 3,167.4
Short-term investments 0.0 0.0
Total 6,379.2 3,167.4
Derivative financial instruments 0.0 0.0
Loan receivable 0.0 0.0
Long-term debt 4,561.8 4,496.2
Level 2 | Fair value, recurring    
Derivative [Line Items]    
Derivative financial instruments 96.5 31.1
Money market funds 0.0 0.0
Short-term investments 5.4 5.4
Total 101.9 36.5
Derivative financial instruments 113.6 156.7
Loan receivable 0.0 0.0
Long-term debt 0.0 0.0
Level 3 | Fair value, recurring    
Derivative [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
Loan receivable 1,339.4 776.1
Long-term debt € 0.0 € 0.0