Per Share Information (Tables)

3 Months Ended

Mar. 31, 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 ended
	March 31, 2024		April 2, 2023
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI	$	66.1	$	84.5
Effect of dilutive securities:
3.5% Convertible Senior Notes due 2025	2.1		2.6
Numerator for diluted net income per common share –
Net income attributable to ATI after assumed conversions	$	68.2	$	87.1
Denominator:
Denominator for basic net income per common share – weighted average shares	126.2		128.5
Effect of dilutive securities:
Share-based compensation	2.5		2.8
3.5% Convertible Senior Notes due 2025	18.8		18.8
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions	147.5		150.1
Basic net income attributable to ATI per common share	$	0.52	$	0.66
Diluted net income attributable to ATI per common share	$	0.46	$	0.58