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Per Share Information (Tables)
 3 Months Ended
Mar. 30, 2025
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share Diluted By Common Class
The following table sets forth the computation of basic and diluted income per common share: 
(In millions, except per share amounts)Quarter ended
March 30, 2025March 31, 2024
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI$97.0 $66.1 
Effect of dilutive securities:
3.5% Convertible Senior Notes due 2025
— 2.1 
Numerator for diluted net income per common share –
Net income attributable to ATI after assumed conversions$97.0 $68.2 
Denominator:
Denominator for basic net income per common share – weighted average shares141.7 126.2 
Effect of dilutive securities:
Share-based compensation2.5 2.5 
3.5% Convertible Senior Notes due 2025
— 18.8 
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions144.2 147.5 
Basic net income attributable to ATI per common share$0.68 $0.52 
Diluted net income attributable to ATI per common share$0.67 $0.46