v3.26.1
Per Share Information (Tables)
 6 Months Ended
Jun. 28, 2026
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Income Per Common Share
The following table sets forth the computation of basic and diluted income per common share: 
(In millions, except per share amounts)Quarter endedYear-to-date period ended
June 28, 2026June 29, 2025June 28, 2026June 29, 2025
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI$151.0 $100.7 $269.2 $197.7 
Denominator:
Denominator for basic net income per common share – weighted average shares136.3 139.8 136.5 140.7 
Effect of dilutive securities:
Share-based compensation2.0 3.3 2.0 3.0 
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions138.3 143.1 138.5 143.7 
Basic net income attributable to ATI per common share$1.11 $0.72 $1.97 $1.40 
Diluted net income attributable to ATI per common share$1.09 $0.70 $1.94 $1.38