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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
EUR (€)
Summary of significant accounting policies [line items]  
Low-value asset recognition exemption to leased assets € 5,000
Technology  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 20 years
Customer relationships  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 25 years
Bottom of range | Computer Software  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 3 years
Bottom of range | Buildings  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 10 years
Bottom of range | Machinery and Equipment  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 3 years
Bottom of range | Vehicles  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 5 years
Top of range | Computer Software  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 5 years
Top of range | Buildings  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 50 years
Top of range | Machinery and Equipment  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 40 years
Top of range | Vehicles  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 8 years