v3.25.2
EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Numerator:        
Net income attributable to equity holders of Constellium $ 36 $ 76 $ 73 $ 97
Denominator:        
Basic - weighted-average ordinary shares outstanding (in shares) 140,820,828 146,271,938 141,665,123 146,534,099
Dilutive effect of non-vested restricted stock units and performance-based restricted stock units (in shares) 1,423,571 2,960,935 1,508,801 3,187,852
Diluted - weighted-average ordinary shares, of restricted stock units and performance-based restricted stock units (in shares) 142,244,399 149,232,873 143,173,924 149,721,951
Basic earnings per share (in USD per share) $ 0.25 $ 0.52 $ 0.51 $ 0.66
Diluted earnings per share (in USD per share) $ 0.25 $ 0.51 $ 0.51 $ 0.65
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 0 0