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Right-of-use assets and lease liabilities - Cash Outflows (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Leases [Abstract]      
Lease payments, total cash flow € 88.7 € 96.3 € 148.2
Lease, weighted average remaining lease term (in months) 296 months 296 months 365 months
Lease, weighted average discount rate (in %) 2.90% 3.00% 2.50%