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TRADE RECEIVABLES AND OTHER - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Disclosure of trade and other receivables [line items]      
Allowance for impairment on trade receivables recognized € 1,900,000   € 400,000
Trade receivables 341,000,000   393,000,000
Total factored assets 514,000,000   574,000,000
Factored assets derecognized 398,000,000   463,000,000
Debt due factor 0   0
Impairment      
Disclosure of trade and other receivables [line items]      
Trade receivables 0   € 0
United States | Factoring of receivables | Muscle Shoals factoring facility      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity | $   $ 300,000,000  
United States | Factoring of receivables | Constellium automotive      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity | $   $ 25,000,000  
France | Factoring of receivables      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity 255,000,000    
France | Factoring Receivable, Recourse Line      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity 20,000,000    
Germany, Switzerland and Czech Republic | Factoring of receivables      
Disclosure of trade and other receivables [line items]      
Factoring maximum capacity € 150,000,000