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Accounts receivable, net - Narrative (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Factoring arrangements for cash € 6,212.5 € 2,042.7
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Factoring arrangements for cash 2,704.8 1,639.9
Irrevocable accounts receivable for down payments    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Factoring arrangements for cash € 3,507.7 € 402.8