Per Share Information (Tables)

9 Months Ended

Sep. 30, 2023

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


(In millions, except per share amounts)	Three months ended September 30,				Nine months ended September 30,
	2023		2022		2023		2022
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI	$	75.7	$	61.1	$	221.8	$	54.0
Effect of dilutive securities:
3.5% Convertible Senior Notes due 2025	2.7		2.8		7.9		—
Numerator for diluted net income per common share –
Net income attributable to ATI after assumed conversions	$	78.4	$	63.9	$	229.7	$	54.0
Denominator:
Denominator for basic net income per common share – weighted average shares	128.1		129.8		128.4		126.9
Effect of dilutive securities:
Share-based compensation	3.3		2.2		2.9		2.0
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	150.2		150.8		150.1		128.9
Basic net income attributable to ATI per common share	$	0.59	$	0.47	$	1.73	$	0.43
Diluted net income attributable to ATI per common share	$	0.52	$	0.42	$	1.53	$	0.42