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Per Share Information (Tables) | 9 Months Ended
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Sep. 29, 2024
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
September 29, 2024 |  | October 1, 2023 |  | September 29, 2024 |  | October 1, 2023
Numerator: |  |  |  |  |  |  |
Numerator for basic income per common share – |  |  |  |  |  |  |
Net income attributable to ATI | $ | 82.7 |  |  | $ | 90.2 |  |  | $ | 230.7 |  |  | $ | 265.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
3.5% Convertible Senior Notes due 2025 | 1.7 |  |  | 2.7 |  |  | 6.0 |  |  | 7.9 |
Numerator for diluted net income per common share – |  |  |  |  |  |  |
Net income attributable to ATI after assumed conversions | $ | 84.4 |  |  | $ | 92.9 |  |  | $ | 236.7 |  |  | $ | 273.0 |
Denominator: |  |  |  |  |  |  |
Denominator for basic net income per common share – weighted average shares | 128.7 |  |  | 128.1 |  |  | 126.5 |  |  | 128.4 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation | 3.7 |  |  | 3.3 |  |  | 3.1 |  |  | 2.9 |
3.5% Convertible Senior Notes due 2025 | 14.4 |  |  | 18.8 |  |  | 17.3 |  |  | 18.8 |
Denominator for diluted net income per common share – adjusted weighted average shares and assumed conversions | 146.8 |  |  | 150.2 |  |  | 146.9 |  |  | 150.1 |
Basic net income attributable to ATI per common share | $ | 0.64 |  |  | $ | 0.70 |  |  | $ | 1.82 |  |  | $ | 2.06 |
Diluted net income attributable to ATI per common share | $ | 0.57 |  |  | $ | 0.62 |  |  | $ | 1.61 |  |  | $ | 1.82 |

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