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Per Share Information (Tables) | 12 Months Ended
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Dec. 29, 2024
Earnings Per Share [Abstract] |
Schedule earnings per share | The following table sets forth the computation of basic and diluted net income per common share: (In millions, except per share amounts)
|  | Fiscal Year
|  | 2024 |  | 2023 |  | 2022
Numerator: |  |  |  |  |  |
Numerator for basic net income per common share - |  |  |  |  |  |
Net income attributable to ATI |  | $ | 367.8 |  |  | $ | 410.8 |  |  | $ | 323.5 |
Effect of dilutive securities: |  |  |  |  |  |
4.75% Convertible Senior Notes due 2022 |  | — |  |  | — |  |  | 2.2 |
3.5% Convertible Senior Notes due 2025 |  | 5.9 |  |  | 10.6 |  |  | 11.3 |
Numerator for diluted net income per common share - |  |  |  |  |  |
Net income attributable to ATI after assumed conversions |  | $ | 373.7 |  |  | $ | 421.4 |  |  | $ | 337.0 |
Denominator: |  |  |  |  |  |
Denominator for basic net income per common share—weighted average shares |  | 130.4 |  |  | 128.1 |  |  | 127.5 |
Effect of dilutive securities: |  |  |  |  |  |
Share-based compensation |  | 3.2 |  |  | 3.1 |  |  | 2.1 |
4.75% Convertible Senior Notes due 2022 |  | — |  |  | — |  |  | 2.8 |
3.5% Convertible Senior Notes due 2025 |  | 13.0 |  |  | 18.8 |  |  | 18.8 |
Denominator for diluted net income per common share—adjusted weighted average shares and assumed conversions |  | 146.6 |  |  | 150.0 |  |  | 151.2 |
Basic net income attributable to ATI per common share |  | $ | 2.82 |  |  | $ | 3.21 |  |  | $ | 2.54 |
Diluted net income attributable to ATI per common share |  | $ | 2.55 |  |  | $ | 2.81 |  |  | $ | 2.23 |

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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482689/260-10-45-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482635/260-10-55-52 + Details
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