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Debt (Tables) | 6 Months Ended
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Jun. 29, 2025
Debt Disclosure [Abstract] |
Schedule of Debt Instruments | Debt at June 29, 2025 and December 29, 2024 was as follows (in millions):
| June 29, 2025 |  | December 29, 2024
ATI Inc. 7.25% Notes due 2030 | $ | 425.0 |  |  | $ | 425.0 |
ATI Inc. 5.875% Notes due 2027 | 350.0 |  |  | 350.0 |
ATI Inc. 5.125% Notes due 2031 | 350.0 |  |  | 350.0 |
ATI Inc. 4.875% Notes due 2029 | 325.0 |  |  | 325.0 |
Allegheny Ludlum 6.95% Debentures due 2025 (a) | 150.0 |  |  | 150.0 |
ABL Term Loan | 200.0 |  |  | 200.0 |
U.S. revolving credit facility | — |  |  | — |
Foreign credit facilities | — |  |  | — |
Finance leases and other | 102.9 |  |  | 109.5 |
Debt issuance costs | (12.9) |  |  | (14.2) |
Debt | 1,890.0 |  |  | 1,895.3 |
Short-term debt and current portion of long-term debt | 179.3 |  |  | 180.4 |
Long-term debt | $ | 1,710.7 |  |  | $ | 1,714.9 |
(a) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI.

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