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Per Share Information
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Per Share Information
Per Share Information
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
)

Common stock that would be issuable upon the assumed conversion of the 2022 Convertible Notes and other option equivalents and contingently issuable shares are excluded from the computation of contingently issuable shares, and therefore, from the denominator for diluted earnings per share, if the effect of inclusion is anti-dilutive. There were 9.3 million and 5.0 million anti-dilutive shares for the three and six month periods ended June 30, 2016, respectively. There were 1.2 million and 1.0 million anti-dilutive shares for the three and six month periods ended June 30, 2015, respectively.