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Inventories, net - Inventories (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Inventory Disclosure [Abstract]      
Raw materials € 5,298.5 € 4,911.2  
Work-in-process 4,768.5 4,872.3  
Finished products 2,135.1 2,019.5  
Inventories, gross 12,202.1 11,803.0  
Inventory reserves (772.8) (911.5) € (693.2)
Inventories, net € 11,429.3 € 10,891.5