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Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 2021
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:
(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) |

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