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Per Share Information (Tables)
 6 Months Ended
Jun. 30, 2017
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,
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Numerator for basic income (loss) per common share –
 
 
 
 
 
 
 
Net income (loss) attributable to ATI
$
10.1

 
$
(18.8
)
 
$
27.6

 
$
(120.0
)
Effect of dilutive securities:
 
 
 
 
 
 
 
4.75% Convertible Senior Notes due 2022
1.8

 
—

 
4.8

 
—

Numerator for diluted income (loss) per common share –
 
 
 
 
 
 
 
Net income (loss) attributable to ATI after assumed conversions
$
11.9

 
$
(18.8
)
 
$
32.4

 
$
(120.0
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net income (loss) per common share – weighted average shares
107.7

 
107.3

 
107.6

 
107.3

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based compensation
0.7

 
—

 
0.8

 
—

4.75% Convertible Senior Notes due 2022
19.9

 
—

 
19.9

 
—

Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions
128.3

 
107.3

 
128.3

 
107.3

Basic net income (loss) attributable to ATI per common share
$
0.09

 
$
(0.18
)
 
$
0.26

 
$
(1.12
)
Diluted net income (loss) attributable to ATI per common share
$
0.09

 
$
(0.18
)
 
$
0.25

 
$
(1.12
)