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Per Share Information (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
Nine months ended
(In millions, except per share amounts)
September 30,
 
September 30,
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Numerator for basic loss per common share –
 
 
 
 
 
 
 
Net loss attributable to ATI
$
(121.2
)
 
$
(530.8
)
 
$
(93.6
)
 
$
(650.8
)
Effect of dilutive securities:
 
 
 
 
 
 
 
4.75% Convertible Senior Notes due 2022
—

 
—

 
—

 
—

Numerator for diluted loss per common share –
 
 
 
 
 
 
 
Net loss attributable to ATI after assumed conversions
$
(121.2
)
 
$
(530.8
)
 
$
(93.6
)
 
$
(650.8
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net loss per common share – weighted average shares
107.7

 
107.3

 
107.7

 
107.3

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
107.7

 
107.3

 
107.7

 
107.3

Basic net loss attributable to ATI per common share
$
(1.12
)
 
$
(4.95
)
 
$
(0.87
)
 
$
(6.07
)
Diluted net loss attributable to ATI per common share
$
(1.12
)
 
$
(4.95
)
 
$
(0.87
)
 
$
(6.07
)