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Per Share Information
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Per Share Information
Per Share Information
The following table sets forth the computation of basic and diluted income (loss) per common share: 
 
Three months ended
(In millions, except per share amounts)
March 31,
2016
 
2015
Numerator for basic income (loss) per common share –
 
 
 
Income (loss) attributable to ATI
$
(101.2
)
 
$
10.0

Redeemable noncontrolling interest (Note 10)
—

 
(0.1
)
Numerator for diluted income (loss) per common share –
 
 
 
Income (loss) available to ATI after assumed conversions
$
(101.2
)
 
$
9.9

Denominator for basic net income (loss) per common share – weighted average shares
107.3

 
107.2

Effect of dilutive securities:
 
 
 
Share-based compensation
—

 
0.8

Denominator for diluted net income (loss) per common share – adjusted weighted average shares assuming conversions
107.3

 
108.0

Basic income (loss) attributable to ATI per common share
$
(0.94
)
 
$
0.09

Diluted income (loss) attributable to ATI per common share
$
(0.94
)
 
$
0.09


There were 0.8 million anti-dilutive shares for the three month period ended March 31, 2016. There were no anti-dilutive shares for the three month period ended March 31, 2015.