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Per Share Information (Tables)
 3 Months Ended
Mar. 31, 2020
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 per common share: 
 
Three months ended
(In millions, except per share amounts)
March 31,
2020
 
2019
Numerator:
 
 
 
Numerator for basic income per common share –
 
 
 
Net income attributable to ATI
$
21.1

 
$
15.0

Effect of dilutive securities:
 
 
 
4.75% Convertible Senior Notes due 2022
2.3

 
—

Numerator for diluted income per common share –
 
 
 
Net income attributable to ATI after assumed conversions
$
23.4

 
$
15.0

Denominator:
 
 
 
Denominator for basic net income per common share – weighted average shares
126.1

 
125.4

Effect of dilutive securities:
 
 
 
Share-based compensation
0.4

 
0.7

4.75% Convertible Senior Notes due 2022
19.9

 
—

Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions
146.4

 
126.1

Basic net income attributable to ATI per common share
$
0.17

 
$
0.12

Diluted net income attributable to ATI per common share
$
0.16

 
$
0.12