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ENTITY-WIDE DISCLOSURES - Analysis of Non-Current Assets other than Financial Instruments and Deferred Tax Assets by Geographic Location (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Entity Location [Line Items]      
Property, plant and equipment € 1,575,200 € 1,457,825  
Goodwill 785,182 785,182  
Intangible assets 1,419,699 1,307,388 € 1,138,173
Italy      
Entity Location [Line Items]      
Property, plant and equipment 1,532,516 1,418,846  
Goodwill 785,182 785,182  
Intangible assets 1,419,447 1,307,127  
Rest of EMEA      
Entity Location [Line Items]      
Property, plant and equipment 5,388 4,830  
Goodwill 0 0  
Intangible assets 0 0  
Americas      
Entity Location [Line Items]      
Property, plant and equipment 29,701 27,233  
Goodwill 0 0  
Intangible assets 0 0  
of which Mainland China      
Entity Location [Line Items]      
Property, plant and equipment 3,100 4,598  
Goodwill 0 0  
Intangible assets 0 0  
Rest of APAC      
Entity Location [Line Items]      
Property, plant and equipment 4,495 2,318  
Goodwill 0 0  
Intangible assets € 252 € 261