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Per Share Information
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Per Share Information
Per Share Information
The following table sets forth the computation of basic and diluted income from continuing operations per common share: 
 
Three Months Ended
(In millions, except per share amounts)
March 31,
2015
 
2014
Numerator for basic income (loss) from continuing operations per common share –
 
 
 
Income (loss) from continuing operations attributable to ATI
$
10.0

 
$
(18.1
)
Redeemable noncontrolling interest (Note 10)
(0.1
)
 
—

Numerator for diluted income (loss) from continuing operations per common share –
 
 
 
Income (loss) from continuing operations available to ATI after assumed conversions
$
9.9

 
$
(18.1
)
Denominator for basic net income (loss) per common share-weighted average shares
107.2

 
107.0

Effect of dilutive securities:
 
 
 
Share-based compensation
0.8

 
—

4.25% Convertible Notes due 2014
—

 
—

Denominator for diluted net income (loss) per common share – adjusted weighted average shares assuming conversions
108.0

 
107.0

Basic income (loss) from continuing operations attributable to ATI per common share
$
0.09

 
$
(0.17
)
Diluted income (loss) from continuing operations attributable to ATI per common share
$
0.09

 
$
(0.17
)

Common stock that would be issuable upon the assumed conversion of the 2014 Convertible Notes (prior to maturity on June 2, 2014) 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 month period ended March 31, 2015 and 10.0 million anti-dilutive shares for the three month period ended March 31, 2014.