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Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine months ended September 30,
2023 |  | 2022 |  | 2023 |  | 2022
Numerator: |  |  |  |  |  |  |
Numerator for basic income per common share – |  |  |  |  |  |  |
Net income attributable to ATI | $ | 75.7 |  |  | $ | 61.1 |  |  | $ | 221.8 |  |  | $ | 54.0 |
Effect of dilutive securities: |  |  |  |  |  |  |
3.5% Convertible Senior Notes due 2025 | 2.7 |  |  | 2.8 |  |  | 7.9 |  |  | — |
Numerator for diluted net income per common share – |  |  |  |  |  |  |
Net income attributable to ATI after assumed conversions | $ | 78.4 |  |  | $ | 63.9 |  |  | $ | 229.7 |  |  | $ | 54.0 |
Denominator: |  |  |  |  |  |  |
Denominator for basic net income per common share – weighted average shares | 128.1 |  |  | 129.8 |  |  | 128.4 |  |  | 126.9 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | 3.3 |  |  | 2.2 |  |  | 2.9 |  |  | 2.0 |
3.5% Convertible Senior Notes due 2025 | 18.8 |  |  | 18.8 |  |  | 18.8 |  |  | — |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 150.2 |  |  | 150.8 |  |  | 150.1 |  |  | 128.9 |
Basic net income attributable to ATI per common share | $ | 0.59 |  |  | $ | 0.47 |  |  | $ | 1.73 |  |  | $ | 0.43 |
Diluted net income attributable to ATI per common share | $ | 0.52 |  |  | $ | 0.42 |  |  | $ | 1.53 |  |  | $ | 0.42 |

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