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Right-of-use assets and lease liabilities - Narrative (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Right-of-use assets operating lease category [Line Items]    
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accrued and other liabilities, Accrued and other liabilities Accrued and other liabilities, Accrued and other liabilities
Finance lease, liability € 16.5 € 16.9
Lease liability, decrease 54.6  
Properties    
Right-of-use assets operating lease category [Line Items]    
Finance lease asset € 32.0 € 32.0