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Per Share Information (Tables)
6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share Diluted By Common Class
The following table sets forth the computation of basic and diluted loss per common share: 
 
Three months ended
 
Six months ended
(In millions, except per share amounts)
June 30,
 
June 30,
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Numerator for basic loss per common share –
 
 
 
 
 
 
 
Loss attributable to ATI
$
(18.8
)
 
$
(16.4
)
 
$
(120.0
)
 
$
(6.4
)
Redeemable noncontrolling interest (Note 10)

 

 

 
(0.1
)
Effect of dilutive securities:
 
 
 
 
 
 
 
4.75% Convertible Senior Notes due 2022

 

 

 

Numerator for diluted loss per common share –
 
 
 
 
 
 
 
Loss attributable to ATI after assumed conversions
$
(18.8
)
 
$
(16.4
)
 
$
(120.0
)
 
$
(6.5
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net loss per common share – weighted average shares
107.3

 
107.3

 
107.3

 
107.2

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based compensation

 

 

 

4.75% Convertible Senior Notes due 2022

 

 

 

Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions
107.3

 
107.3

 
107.3

 
107.2

Basic loss attributable to ATI per common share
$
(0.18
)
 
$
(0.15
)
 
$
(1.12
)
 
$
(0.06
)
Diluted loss attributable to ATI per common share
$
(0.18
)
 
$
(0.15
)
 
$
(1.12
)
 
$
(0.06
)