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Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Schedule of debt | Debt at December 31, 2022 and 2021 was as follows:
(In millions) |  | 2022 |  | 2021
ATI Inc. 5.875% Senior Notes due 2027 |  | 350.0 |  |  | 350.0 |
ATI Inc. 5.125% Senior 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 |
ATI Inc. 4.75% Convertible Senior Notes due 2022 |  | — |  |  | 84.2 |
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 agreements |  | 19.4 |  |  | 27.4 |
Finance leases and other |  | 79.4 |  |  | 85.7 |
Debt issuance costs |  | (17.2) |  |  | (20.8) |
Total short-term and long-term debt |  | 1,748.0 |  |  | 1,842.9 |
Short-term debt and current portion of long-term debt |  | 41.7 |  |  | 131.3 |
Total long-term debt |  | $ | 1,706.3 |  |  | $ | 1,711.6 |
(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:
| Fiscal year ended December 31,
(in millions) | 2022 |  | 2021 |  | 2020
Contractual coupon rate | $ | 10.2 |  |  | $ | 10.2 |  |  | $ | 5.3 |
Amortization of debt issuance costs | 1.8 |  |  | 1.7 |  |  | 0.7 |
Total interest expense | $ | 12.0 |  |  | $ | 11.9 |  |  | $ | 6.0 |
Interest expense on the 2022 Convertible Notes was as follows:
| Fiscal year ended December 31,
(in millions) | 2022 |  | 2021 |  | 2020
Contractual coupon rate | $ | 2.0 |  |  | $ | 4.0 |  |  | $ | 8.6 |
Amortization of debt issuance costs | 0.3 |  |  | 0.5 |  |  | 1.0 |
Total interest expense | $ | 2.3 |  |  | $ | 4.5 |  |  | $ | 9.6 |

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