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Debt (Tables) | 3 Months Ended
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Mar. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Debt Instruments | Debt at March 31, 2024 and December 31, 2023 was as follows (in millions):
| March 31, 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 |  |  | 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 | 100.6 |  |  | 102.8 |
Debt issuance costs | (18.5) |  |  | (19.6) |
Debt | 2,173.5 |  |  | 2,179.6 |
Short-term debt and current portion of long-term debt | 27.1 |  |  | 31.9 |
Long-term debt | $ | 2,146.4 |  |  | $ | 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
(in millions) | March 31, 2024 | April 2, 2023
Contractual coupon rate | $ | 2.5 |  | $ | 2.5 |
Amortization of debt issuance costs | 0.5 |  | 0.5 |
Total interest expense | $ | 3.0 |  | $ | 3.0 |

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