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Debt (Tables) | 9 Months Ended
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Sep. 29, 2024
Debt Disclosure [Abstract] |
Schedule of Debt Instruments | Debt at September 29, 2024 and December 31, 2023 was as follows (in millions):
| September 29, 2024 |  | December 31, 2023
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 |
ATI Inc. 3.5% Convertible Senior Notes due 2025 | — |  |  | 291.4 |
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 | — |  |  | 5.0 |
Finance leases and other | 98.2 |  |  | 102.8 |
Debt issuance costs | (14.8) |  |  | (19.6) |
Debt | 1,883.4 |  |  | 2,179.6 |
Short-term debt and current portion of long-term debt | 27.9 |  |  | 31.9 |
Long-term debt | $ | 1,855.5 |  |  | $ | 2,147.7 |
(a) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI.
Interest Income and Interest Expense Disclosure | Interest expense on the 2025 Convertible Notes was as follows:
| Quarter ended |  | Year-to-date period ended
(in millions) | September 29, 2024 | October 1, 2023 |  | September 29, 2024 | October 1, 2023
Contractual coupon rate | $ | 2.1 |  | $ | 2.5 |  |  | $ | 7.2 |  | $ | 7.6 |
Amortization of debt issuance costs | 0.3 |  | 0.5 |  |  | 1.3 |  | 1.4 |
Total interest expense | $ | 2.4 |  | $ | 3.0 |  |  | $ | 8.5 |  | $ | 9.0 |

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