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Per Share Information | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Per Share Information | Per Share Information The following table sets forth the computation of basic and diluted income (loss) per common share:
(In millions, except per share amounts) | Three months ended September 30, | Nine months ended September 30,
2021 |  | 2020 | 2021 |  | 2020
Numerator: |  |  |  |  |  |
Numerator for basic income (loss) per common share – |  |  |  |  |  |
Net income (loss) attributable to ATI | $ | 48.7 |  |  | $ | (50.1) |  | $ | (8.4) |  |  | $ | (451.6) |
Effect of dilutive securities: |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 | 1.1 |  |  | — |  | — |  |  | — |
3.5% Convertible Senior Notes due 2025 | 2.9 |  |  | — |  | — |  |  | — |
Numerator for diluted income (loss) per common share – |  |  |  |  |  |
Net income (loss) attributable to ATI after assumed conversions | $ | 52.7 |  |  | $ | (50.1) |  | $ | (8.4) |  |  | $ | (451.6) |
Denominator: |  |  |  |  |  |
Denominator for basic net income (loss) per common share – weighted average shares | 127.2 |  |  | 126.6 |  | 127.0 |  |  | 126.5 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation | 0.8 |  |  | — |  | — |  |  | — |
4.75% Convertible Senior Notes due 2022 | 5.8 |  |  | — |  | — |  |  | — |
3.5% Convertible Senior Notes due 2025 | 18.8 |  |  | — |  | — |  |  | — |
Denominator for diluted net income (loss) per common share – adjusted weighted average shares and assumed conversions | 152.6 |  |  | 126.6 |  | 127.0 |  |  | 126.5 |
Basic net income (loss) attributable to ATI per common share | $ | 0.38 |  |  | $ | (0.40) |  | $ | (0.07) |  |  | $ | (3.57) |
Diluted net income (loss) attributable to ATI per common share | $ | 0.35 |  |  | $ | (0.40) |  | $ | (0.07) |  |  | $ | (3.57) |
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 no anti-dilutive shares for the three months ended September 30, 2021. There were 25.6 million anti-dilutive shares for the nine months ended September 30, 2021, and 25.0 million and 21.9 million anti-dilutive shares for the three and nine months ended September 30, 2020, respectively.

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