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Per Share Information (Tables)

6 Months Ended

Jun. 30, 2020

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: 

			Three months ended																		Six months ended
(In millions, except per share amounts)			June 30,																		June 30,
						2020						2019						2020						2019
Numerator:
Numerator for basic (loss) income per common share –
Net (loss) income attributable to ATI			$	(422.6)					$	75.1					$	(401.5)					$	90.1
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022			—						3.2						—						6.5
3.5% Convertible Senior Notes due 2025			—						—						—						—
Numerator for diluted (loss) income per common share –
Net (loss) income attributable to ATI after assumed conversions			$	(422.6)					$	78.3					$	(401.5)					$	96.6
Denominator:
Denominator for basic net (loss) income per common share – weighted average shares			126.6						125.9						126.4						125.7
Effect of dilutive securities:
Share-based compensation			—						0.6						—						0.6
4.75% Convertible Senior Notes due 2022			—						19.9						—						19.9
3.5% Convertible Senior Notes due 2025			—						—						—						—
Denominator for diluted net (loss) income per common share – adjusted weighted average shares and assumed conversions			126.6						146.4						126.4						146.2
Basic net (loss) income attributable to ATI per common share			$	(3.34)					$	0.60					$	(3.18)					$	0.72
Diluted net (loss) income attributable to ATI per common share			$	(3.34)					$	0.54					$	(3.18)					$	0.66

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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 http://asc.fasb.org/extlink&oid=121326447&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 http://asc.fasb.org/extlink&oid=6371337&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 http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258

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