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Per Share Information (Tables)
 9 Months Ended
Sep. 29, 2024
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 endedYear-to-date period ended
September 29, 2024October 1, 2023September 29, 2024October 1, 2023
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI$82.7 $90.2 $230.7 $265.1 
Effect of dilutive securities:
3.5% Convertible Senior Notes due 2025
1.7 2.7 6.0 7.9 
Numerator for diluted net income per common share –
Net income attributable to ATI after assumed conversions$84.4 $92.9 $236.7 $273.0 
Denominator:
Denominator for basic net income per common share – weighted average shares128.7 128.1 126.5 128.4 
Effect of dilutive securities:
Share-based compensation3.7 3.3 3.1 2.9 
3.5% Convertible Senior Notes due 2025
14.4 18.8 17.3 18.8 
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions146.8 150.2 146.9 150.1 
Basic net income attributable to ATI per common share$0.64 $0.70 $1.82 $2.06 
Diluted net income attributable to ATI per common share$0.57 $0.62 $1.61 $1.82