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Per Share Information
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Per Share Information Per Share Information
The following table sets forth the computation of basic and diluted income per common share: 
 
Three months ended
 
Six months ended
(In millions, except per share amounts)
June 30,
 
June 30,
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Numerator for basic income per common share –
 
 
 
 
 
 
 
Net income attributable to ATI
$
75.1

 
$
72.8

 
$
90.1

 
$
130.8

Effect of dilutive securities:
 
 
 
 
 
 
 
4.75% Convertible Senior Notes due 2022
3.2

 
3.2

 
6.5

 
6.4

Numerator for diluted income per common share –
 
 
 
 
 
 
 
Net income attributable to ATI after assumed conversions
$
78.3

 
$
76.0

 
$
96.6

 
$
137.2

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
0.6

 
0.7

 
0.6

 
0.6

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
146.4

 
145.8

 
146.2

 
145.6

Basic net income attributable to ATI per common share
$
0.60

 
$
0.58

 
$
0.72

 
$
1.05

Diluted net income attributable to ATI per common share
$
0.54

 
$
0.52

 
$
0.66

 
$
0.94


Common stock that would be issuable upon the assumed conversion of the 4.75% Convertible Senior Notes due 2022 and other option equivalents and contingently issuable shares are excluded from the computation of contingently issuable shares, and therefore, from the denominator for diluted earnings per share, if the effect of inclusion is anti-dilutive. There were no anti-dilutive shares for the three and six months ended June 30, 2019 and 2018.