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Per Share Information (Tables) | 6 Months Ended
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Jun. 29, 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 |  | Year-to-date period ended
June 29, 2025 |  | June 30, 2024 |  | June 29, 2025 |  | June 30, 2024
Numerator: |  |  |  |  |  |  |
Numerator for basic income per common share – |  |  |  |  |  |  |
Net income attributable to ATI | $ | 100.7 |  |  | $ | 81.9 |  |  | $ | 197.7 |  |  | $ | 148.0 |
Effect of dilutive securities: |  |  |  |  |  |  |
3.5% Convertible Senior Notes due 2025 | — |  |  | 2.2 |  |  | — |  |  | 4.3 |
Numerator for diluted net income per common share – |  |  |  |  |  |  |
Net income attributable to ATI after assumed conversions | $ | 100.7 |  |  | $ | 84.1 |  |  | $ | 197.7 |  |  | $ | 152.3 |
Denominator: |  |  |  |  |  |  |
Denominator for basic net income per common share – weighted average shares | 139.8 |  |  | 124.4 |  |  | 140.7 |  |  | 125.3 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | 3.3 |  |  | 3.1 |  |  | 3.0 |  |  | 2.8 |
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 | 143.1 |  |  | 146.3 |  |  | 143.7 |  |  | 146.9 |
Basic net income attributable to ATI per common share | $ | 0.72 |  |  | $ | 0.66 |  |  | $ | 1.40 |  |  | $ | 1.18 |
Diluted net income attributable to ATI per common share | $ | 0.70 |  |  | $ | 0.58 |  |  | $ | 1.38 |  |  | $ | 1.04 |

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