v3.26.1
Earnings Per Share - Calculation of Basic and Diluted Earnings (loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net income (loss) attributable to Ryerson Holding Corporation $ 15.5 $ 1.9 $ 20.0 $ (3.7)
Denominator:        
Weighted average shares outstanding 51,892 32,196 47,175 32,026
Dilutive effect of stock-based awards 711 155 733  
Weighted average shares outstanding adjusted for dilutive securities 52,603 32,351 47,908 32,026
Earnings (loss) per share        
Earnings (loss) per share, Basic $ 0.3 $ 0.06 $ 0.42 $ (0.12)
Earnings (loss) per share, Diluted $ 0.3 $ 0.06 $ 0.42 $ (0.12)