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OPERATING SEGMENT INFORMATION - Narrative (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2022
EUR (€)
employee
country
facility
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Disclosure of operating segments [line items]      
Number of employees | employee 12,500    
Revenue € 8,120 € 6,152 € 4,883
P&ARP      
Disclosure of operating segments [line items]      
Number of facilities | facility 4    
Number of countries in which entity operates | country 3    
Number of employees | employee 4,100    
Revenue € 4,655 3,688 2,725
P&ARP | Group's largest customer      
Disclosure of operating segments [line items]      
Revenue € 839 692 492
A&T      
Disclosure of operating segments [line items]      
Number of facilities | facility 6    
Number of countries in which entity operates | country 3    
Number of employees | employee 3,500    
Revenue € 1,645 1,102 1,002
AS&I      
Disclosure of operating segments [line items]      
Number of facilities | facility 19    
Number of countries in which entity operates | country 10    
Number of employees | employee 4,500    
Revenue € 1,820 € 1,362 € 1,156