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Per Share Information (Tables)

9 Months Ended

Sep. 30, 2022

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 (loss) per common share: 

(In millions, except per share amounts)			Three months ended September 30,									Nine months ended September 30,
			2022						2021			2022						2021
Numerator:
Numerator for basic income (loss) per common share –
Net income (loss) attributable to ATI			$	61.1					$	48.7		$	54.0					$	(8.4)
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022			—						1.1			—						—
3.5% Convertible Senior Notes due 2025			2.8						2.9			—						—
Numerator for diluted net income (loss) per common share –
Net income (loss) attributable to ATI after assumed conversions			$	63.9					$	52.7		$	54.0					$	(8.4)
Denominator:
Denominator for basic net income (loss) per common share – weighted average shares			129.8						127.2			126.9						127.0
Effect of dilutive securities:
Share-based compensation			2.2						0.8			2.0						—
4.75% Convertible Senior Notes due 2022			—						5.8			—						—
3.5% Convertible Senior Notes due 2025			18.8						18.8			—						—
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions			150.8						152.6			128.9						127.0
Basic net income (loss) attributable to ATI per common share			$	0.47					$	0.38		$	0.43					$	(0.07)
Diluted net income (loss) attributable to ATI per common share			$	0.42					$	0.35		$	0.42					$	(0.07)

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1278-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI https://asc.fasb.org/extlink&oid=128363288&loc=d3e4984-109258

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