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Per Share Information (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule earnings per share
The following table sets forth the computation of basic and diluted net income (loss) per common share:
(In millions, except per share amounts)
For the Years Ended December 31,20212020*2019*
Numerator:
Numerator for basic net income (loss) per common share -
Net income (loss) attributable to ATI$(38.2)$(1,572.6)$252.5 
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022— — 12.8 
       3.5% Convertible Senior Notes due 2025— — — 
Numerator for diluted net income (loss) per common share -
Net income (loss) attributable to ATI after assumed conversions$(38.2)$(1,572.6)$265.3 
Denominator:
Denominator for basic net income (loss) per common share—weighted average shares127.1 126.5 125.8 
Effect of dilutive securities:
Share-based compensation— — 0.8 
4.75% Convertible Senior Notes due 2022— — 19.9 
       3.5% Convertible Senior Notes due 2025— — — 
Denominator for diluted net income (loss) per common share—adjusted weighted average shares and assumed conversions127.1 126.5 146.5 
Basic net income (loss) attributable to ATI per common share$(0.30)$(12.43)$2.01 
Diluted net income (loss) attributable to ATI per common share$(0.30)$(12.43)$1.81 
*Years ended December 31, 2020 and 2019 reflect the change in inventory accounting method, as described in Note 1 of the Notes to the Consolidated Financial Statements. There were no adjustments to 2020 amounts as a result of this change.