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Per Share Information (Tables)

9 Months Ended

Sep. 28, 2025

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
			September 28, 2025						September 29, 2024						September 28, 2025						September 29, 2024
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI			$	110.0					$	82.7					$	307.7					$	230.7
Effect of dilutive securities:
3.5% Convertible Senior Notes due 2025			—						1.7						—						6.0
Numerator for diluted net income per common share –
Net income attributable to ATI after assumed conversions			$	110.0					$	84.4					$	307.7					$	236.7
Denominator:
Denominator for basic net income per common share – weighted average shares			137.0						128.7						139.5						126.5
Effect of dilutive securities:
Share-based compensation			3.5						3.7						3.1						3.1
3.5% Convertible Senior Notes due 2025			—						14.4						—						17.3
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions			140.5						146.8						142.6						146.9
Basic net income attributable to ATI per common share			$	0.80					$	0.64					$	2.21					$	1.82
Diluted net income attributable to ATI per common share			$	0.78					$	0.57					$	2.16					$	1.61

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- References

No definition available.

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- Definition

Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-3

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482635/260-10-55-52

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