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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net income attributable to equity holders of Constellium $ 56 $ 152 $ 308
Denominator:      
Basic - weighted-average ordinary shares outstanding (in shares) 145,718,545 146,129,941 143,625,764
Dilutive effect of non-vested restricted stock units and performance-based restricted stock units (in shares) 2,285,621 2,341,994 3,335,426
Diluted - weighted-average ordinary shares, of restricted stock units and performance-based restricted stock units (in shares) 148,004,166 148,471,935 146,961,190
Basic earnings per share (in USD per share) $ 0.38 $ 1.04 $ 2.14
Diluted earnings per share (in USD per share) $ 0.38 $ 1.03 $ 2.10
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 0