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Long-term debt, short-term borrowings, interest and other, net - Estimated Fair Value of Eurobonds (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Long-term debt € 3,590.8 € 4,561.8
Eurobonds    
Debt Instrument [Line Items]    
Long-term debt, gross 3,682.8 4,669.4
Debt instrument, face amount 3,750.0 4,750.0
Long-term debt 3,590.8 4,561.8
Amortized cost amount | Eurobonds    
Debt Instrument [Line Items]    
Carrying amount 3,740.3 4,736.9
Fair value interest rate swaps | Eurobonds    
Debt Instrument [Line Items]    
Carrying amount € (57.5) € (67.5)