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Per Share Information (Tables)
 3 Months Ended
Mar. 31, 2015
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 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
)