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Per Share Information (Tables)
 3 Months Ended
Mar. 31, 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 income (loss) per common share: 
 
Three months ended
(In millions, except per share amounts)
March 31,
2017
 
2016
Numerator:
 
 
 
Numerator for basic income (loss) per common share –
 
 
 
Net income (loss) attributable to ATI
$
17.5

 
$
(101.2
)
Effect of dilutive securities:
 
 
 
4.75% Convertible Senior Notes due 2022
3.0

 
—

Numerator for diluted income (loss) per common share –
 
 
 
Net income (loss) attributable to ATI after assumed conversions
$
20.5

 
$
(101.2
)
Denominator:
 
 
 
Denominator for basic net income (loss) per common share – weighted average shares
107.5

 
107.3

Effect of dilutive securities:
 
 
 
Share-based compensation
0.8

 
—

4.75% Convertible Senior Notes due 2022
19.9

 
—

Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions
128.2

 
107.3

Basic net income (loss) attributable to ATI per common share
$
0.16

 
$
(0.94
)
Diluted net income (loss) attributable to ATI per common share
$
0.16

 
$
(0.94
)