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TRADE RECEIVABLES AND OTHER - Additional Information (Details)
 6 Months Ended
Dec. 09, 2019
USD ($)
Sep. 29, 2019
USD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2019
EUR (€)
Dec. 31, 2019
EUR (€)
Disclosure of trade and other receivables [line items]          
Allowance recognized for impairment on trade receivables     € 400,000 € 100,000  
Factored assets     506,000,000   € 574,000,000
Factored assets, derecognized from Consolidated Statement of Financial Position     (390,000,000)   463,000,000
Factored assets, recognized in Consolidated Statement of Financial Position     116,000,000   111,000,000
Debt due factor     6,839,649   € 0
Factoring of receivables | Muscle Shoals factoring facility          
Disclosure of trade and other receivables [line items]          
Factoring maximum capacity | $   $ 300,000,000      
France | Factoring of receivables          
Disclosure of trade and other receivables [line items]          
Factoring maximum capacity     255,000,000    
Germany, Switzerland and Czech Republic | Factoring of receivables          
Disclosure of trade and other receivables [line items]          
Factoring maximum capacity     € 150,000,000    
United States | Factoring of receivables | Constellium automotive          
Disclosure of trade and other receivables [line items]          
Factoring maximum capacity | $ $ 25,000,000