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Per Share Information (Tables) | 3 Months Ended
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Mar. 31, 2023
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:
(In millions, except per share amounts) | Three months ended March 31,
2023 |  | 2022
Numerator: |  |  |
Numerator for basic income per common share – |  |  |
Net income attributable to ATI | $ | 70.1 |  |  | $ | 30.9 |
Effect of dilutive securities: |  |  |
4.75% Convertible Senior Notes due 2022 | — |  |  | 1.1 |
3.5% Convertible Senior Notes due 2025 | 2.6 |  |  | 2.9 |
Numerator for diluted net income per common share – |  |  |
Net income attributable to ATI after assumed conversions | $ | 72.7 |  |  | $ | 34.9 |
Denominator: |  |  |
Denominator for basic net income per common share – weighted average shares | 128.5 |  |  | 126.4 |
Effect of dilutive securities: |  |  |
Share-based compensation | 2.8 |  |  | 1.8 |
4.75% Convertible Senior Notes due 2022 | — |  |  | 5.8 |
3.5% Convertible Senior Notes due 2025 | 18.8 |  |  | 18.8 |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 150.1 |  |  | 152.8 |
Basic net income attributable to ATI per common share | $ | 0.55 |  |  | $ | 0.24 |
Diluted net income attributable to ATI per common share | $ | 0.48 |  |  | $ | 0.23 |

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