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Per Share Information (Tables)
 6 Months Ended
Jun. 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
 
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