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Inventories, net - Inventories (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Inventory Disclosure [Abstract]      
Raw materials € 4,911.2 € 4,057.3  
Work-in-process 4,872.3 3,388.1  
Finished products 2,019.5 2,098.5  
Inventories, gross 11,803.0 9,543.9  
Inventory reserves (911.5) (693.2) € (466.9)
Inventories, net € 10,891.5 € 8,850.7