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Per Share Information (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule earnings per share
The following table sets forth the computation of basic and diluted income (loss) from continuing operations per common share:
(In millions, except per share amounts)
For the Years Ended December 31,
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
 
Numerator for basic income (loss) from continuing operations per common share -
 
 
 
 
 
 
Income (loss) from continuing operations attributable to ATI
 
$
(2.0
)
 
$
(98.8
)
 
$
150.5

Redeemable noncontrolling interest (Note 17)
 
(0.3
)
 
—

 
—

Effect of dilutive securities:
 
 
 
 
 
 
4.25% Convertible Senior Notes due 2014
 
—

 
—

 
8.5

Numerator for diluted net income (loss) per common share -
 
 
 
 
 
 
Income (loss) from continuing operations attributable to ATI after assumed conversions
 
$
(2.3
)
 
$
(98.8
)
 
$
159.0

Denominator:
 
 
 
 
 
 
Denominator for basic net income per common share—weighted average shares
 
107.1

 
106.8

 
106.1

Effect of dilutive securities:
 
 
 
 
 
 
Share-based compensation
 
—

 
—

 
0.9

4.25% Convertible Senior Notes due 2014
 
—

 
—

 
9.6

Denominator for diluted net income per common share—adjusted weighted average shares and assumed conversions
 
107.1

 
106.8

 
116.6

Basic income (loss) from continuing operations attributable to ATI per common share
 
$
(0.02
)
 
$
(0.93
)
 
$
1.42

Diluted income (loss) from continuing operations attributable to ATI per common share
 
$
(0.02
)
 
$
(0.93
)
 
$
1.36