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Per Share Information (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule earnings per share
The following table sets forth the computation of basic and diluted net loss per common share:
(In millions, except per share amounts)
For the Years Ended December 31,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
 
Numerator for basic net loss per common share -
 
 
 
 
 
 
Net loss attributable to ATI
 
$
(91.9
)
 
$
(640.9
)
 
$
(377.9
)
Redeemable noncontrolling interest (Note 17)
 
—

 
—

 
(0.3
)
Effect of dilutive securities:
 
 
 
 
 
 
4.75% Convertible Senior Notes due 2022
 
—

 
—

 
—

Numerator for diluted net loss per common share -
 
 
 
 
 
 
Net loss attributable to ATI after assumed conversions
 
$
(91.9
)
 
$
(640.9
)
 
$
(378.2
)
Denominator:
 
 
 
 
 
 
Denominator for basic net loss per common share—weighted average shares
 
110.1

 
107.3

 
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
 
110.1

 
107.3

 
107.3

Basic net loss attributable to ATI per common share
 
$
(0.83
)
 
$
(5.97
)
 
$
(3.53
)
Diluted net loss attributable to ATI per common share
 
$
(0.83
)
 
$
(5.97
)
 
$
(3.53
)