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Per Share Information (Tables)
 6 Months Ended
Jun. 30, 2018
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,
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Numerator for basic income per common share –
 
 
 
 
 
 
 
Net income attributable to ATI
$
72.8

 
$
10.1

 
$
130.8

 
$
27.6

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

 
1.8

 
6.4

 
4.8

Numerator for diluted income per common share –
 
 
 
 
 
 
 
Net income attributable to ATI after assumed conversions
$
76.0

 
$
11.9

 
$
137.2

 
$
32.4

Denominator:
 
 
 
 
 
 
 
Denominator for basic net income per common share – weighted average shares
125.2

 
107.7

 
125.1

 
107.6

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based compensation
0.7

 
0.7

 
0.6

 
0.8

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
145.8

 
128.3

 
145.6

 
128.3

Basic net income attributable to ATI per common share
$
0.58

 
$
0.09

 
$
1.05

 
$
0.26

Diluted net income attributable to ATI per common share
$
0.52

 
$
0.09

 
$
0.94

 
$
0.25