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Long-term debt and interest and other costs - Estimated Fair Value of Eurobonds (Details) - Eurobonds - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Long-term debt, gross € 4,669.4 € 4,610.4
Debt Instrument, Face Amount 4,750.0 4,750.0
Long-term debt 4,561.8 4,496.2
Amortized cost amount    
Debt Instrument [Line Items]    
Carrying amount 4,736.9 4,731.7
Fair value interest rate swaps    
Debt Instrument [Line Items]    
Carrying amount € (67.5) € (121.3)