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Per Share Information (Tables)
 9 Months Ended
Sep. 30, 2018
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
 
Nine months ended
(In millions, except per share amounts)
September 30,
 
September 30,
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Numerator for basic income (loss) per common share –
 
 
 
 
 
 
 
Net income (loss) attributable to ATI
$
50.5

 
$
(121.2
)
 
$
181.3

 
$
(93.6
)
Effect of dilutive securities:
 
 
 
 
 
 
 
4.75% Convertible Senior Notes due 2022
3.2

 
—

 
9.6

 
—

Numerator for diluted income (loss) per common share –
 
 
 
 
 
 
 
Net income (loss) attributable to ATI after assumed conversions
$
53.7

 
$
(121.2
)
 
$
190.9

 
$
(93.6
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net income (loss) per common share – weighted average shares
125.2

 
107.7

 
125.1

 
107.7

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based compensation
0.9

 
—

 
0.7

 
—

4.75% Convertible Senior Notes due 2022
19.9

 
—

 
19.9

 
—

Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions
146.0

 
107.7

 
145.7

 
107.7

Basic net income (loss) attributable to ATI per common share
$
0.40

 
$
(1.12
)
 
$
1.45

 
$
(0.87
)
Diluted net income (loss) attributable to ATI per common share
$
0.37

 
$
(1.12
)
 
$
1.31

 
$
(0.87
)