Per Share Information (Tables)

12 Months Ended

Dec. 31, 2023

The following table sets forth the computation of basic and diluted net income per common share:

(In millions, except per share amounts)


	Fiscal Year
	2023		2022 Revised		2021 Revised
Numerator:
Numerator for basic net income per common share -
Net income attributable to ATI	$	410.8	$	323.5	$	184.6
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022	—		2.2		4.4
3.5% Convertible Senior Notes due 2025	10.6		11.3		11.8
Numerator for diluted net income per common share -
Net income attributable to ATI after assumed conversions	$	421.4	$	337.0	$	200.8
Denominator:
Denominator for basic net income per common share—weighted average shares	128.1		127.5		127.1
Effect of dilutive securities:
Share-based compensation	3.1		2.1		1.0
4.75% Convertible Senior Notes due 2022	—		2.8		5.8
3.5% Convertible Senior Notes due 2025	18.8		18.8		18.8
Denominator for diluted net income per common share—adjusted weighted average shares and assumed conversions	150.0		151.2		152.7
Basic net income attributable to ATI per common share	$	3.21	$	2.54	$	1.45
Diluted net income attributable to ATI per common share	$	2.81	$	2.23	$	1.32