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Right-of-use assets and lease liabilities - Cash Outflows (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]      
Lease payments, total cash flow € 148.2 € 57.9 € 68.9
Lease, weighted average remaining lease term (in months) 365 months 67 months 62 months
Lease, weighted average discount rate (in %) 2.50% 2.20% 1.90%