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Per Share Information (Tables)

9 Months Ended

Sep. 30, 2019

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: 

	Three months ended								Nine months ended
(In millions, except per share amounts)	September 30,								September 30,
	2019				2018				2019				2018
Numerator:
Numerator for basic income per common share –
Net income attributable to ATI	$	111.0			$	50.5			$	201.1			$	181.3
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022	3.2				3.2				9.7				9.6
Numerator for diluted income per common share –
Net income attributable to ATI after assumed conversions	$	114.2			$	53.7			$	210.8			$	190.9
Denominator:
Denominator for basic net income per common share – weighted average shares	125.9				125.2				125.7				125.1
Effect of dilutive securities:
Share-based compensation	0.9				0.9				0.8				0.7
4.75% Convertible Senior Notes due 2022	19.9				19.9				19.9				19.9
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions	146.7				146.0				146.4				145.7
Basic net income attributable to ATI per common share	$	0.88			$	0.40			$	1.60			$	1.45
Diluted net income attributable to ATI per common share	$	0.78			$	0.37			$	1.44			$	1.31

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- Definition

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

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