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SHARE CAPITAL (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure of share capital, reserves and other equity interest [Abstract]  
Schedule of Share Capital
(in millions of Euros)
Number of sharesShare capitalShare premium
At January 1, 2020137,867,418 420 
New shares issued (A)2,095,254 — — 
At December 31, 2020139,962,672 3 420 
(A)Constellium SE issued and delivered 2,095,254 ordinary shares to certain employees and directors related to share-based compensation plans.