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Per Share Information (Tables) | 3 Months Ended
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Mar. 30, 2025
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) | Quarter ended
March 30, 2025 |  | March 31, 2024
Numerator: |  |  |
Numerator for basic income per common share – |  |  |
Net income attributable to ATI | $ | 97.0 |  |  | $ | 66.1 |
Effect of dilutive securities: |  |  |
3.5% Convertible Senior Notes due 2025 | — |  |  | 2.1 |
Numerator for diluted net income per common share – |  |  |
Net income attributable to ATI after assumed conversions | $ | 97.0 |  |  | $ | 68.2 |
Denominator: |  |  |
Denominator for basic net income per common share – weighted average shares | 141.7 |  |  | 126.2 |
Effect of dilutive securities: |  |  |
Share-based compensation | 2.5 |  |  | 2.5 |
3.5% Convertible Senior Notes due 2025 | — |  |  | 18.8 |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 144.2 |  |  | 147.5 |
Basic net income attributable to ATI per common share | $ | 0.68 |  |  | $ | 0.52 |
Diluted net income attributable to ATI per common share | $ | 0.67 |  |  | $ | 0.46 |

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