Per Share Information (Tables)

6 Months Ended

Jun. 30, 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				Year-to-date period ended
	June 30, 2024		July 2, 2023		June 30, 2024		July 2, 2023
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI	$	81.9	$	90.4	$	148.0	$	174.9
Effect of dilutive securities:
3.5% Convertible Senior Notes due 2025	2.2		2.6		4.3		5.2
Numerator for diluted net income per common share –
Net income attributable to ATI after assumed conversions	$	84.1	$	93.0	$	152.3	$	180.1
Denominator:
Denominator for basic net income per common share – weighted average shares	124.4		128.5		125.3		128.5
Effect of dilutive securities:
Share-based compensation	3.1		2.8		2.8		2.8
3.5% Convertible Senior Notes due 2025	18.8		18.8		18.8		18.8
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions	146.3		150.1		146.9		150.1
Basic net income attributable to ATI per common share	$	0.66	$	0.70	$	1.18	$	1.36
Diluted net income attributable to ATI per common share	$	0.58	$	0.62	$	1.04	$	1.20