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Per Share Information | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Per Share Information | Per Share Information 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, |  | 2021 |  | 2020* |  | 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 shares |  | 127.1 |  |  | 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 conversions |  | 127.1 |  |  | 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. Common stock that would be issuable upon the assumed conversion of the 2022 Convertible Notes and the 2025 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 25.6 million and 22.8 million anti-dilutive shares for 2021 and 2020, respectively. There were no anti-dilutive shares for 2019.

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