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Debt (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Schedule of Debt Instruments | Debt at September 30, 2021 and December 31, 2020 was as follows (in millions):
| September 30, 2021 |  | December 31, 2020
Allegheny Technologies 5.875% Notes due 2023 (a) | $ | 500.0 |  |  | $ | 500.0 |
Allegheny Technologies 5.875% Notes due 2027 | 350.0 |  |  | 350.0 |
Allegheny Technologies 5.125% Notes due 2031 | 350.0 |  |  | — |
Allegheny Technologies 4.875% Notes due 2029 | 325.0 |  |  | — |
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | 291.4 |  |  | 291.4 |
Allegheny Technologies 4.75% Convertible Senior Notes due 2022 | 84.2 |  |  | 84.2 |
Allegheny Ludlum 6.95% Debentures due 2025 (b) | 150.0 |  |  | 150.0 |
Term Loan due 2024 | 200.0 |  |  | 200.0 |
U.S. revolving credit facility | — |  |  | — |
Foreign credit facilities | 9.2 |  |  | 5.5 |
Finance leases and other | 53.5 |  |  | 48.0 |
Debt issuance costs | (22.8) |  |  | (14.5) |
Equity component of convertible debt | — |  |  | (46.8) |
Total debt | 2,290.5 |  |  | 1,567.8 |
Short-term debt and current portion of long-term debt | 606.9 |  |  | 17.8 |
Total long-term debt | $ | 1,683.6 |  |  | $ | 1,550.0 |
(a) Bearing interest at 7.875% effective February 15, 2016. (b) 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:
| Three months ended September 30, |  | Nine months ended September 30,
(in millions) | 2021 | 2020 |  | 2021 |  | 2020
Contractual coupon rate | $ | 2.5 |  | $ | 2.4 |  |  | $ | 7.6 |  |  | $ | 2.4 |
Amortization of debt issuance costs | 0.5 |  | 0.4 |  |  | 1.3 |  |  | 0.4 |
Total interest expense | $ | 3.0 |  | $ | 2.8 |  |  | $ | 8.9 |  |  | $ | 2.8 |
Interest expense on the 2022 Convertible Notes was as follows:
| Three months ended September 30, | Nine months ended September 30,
(in millions) | 2021 |  | 2020 | 2021 |  | 2020
Contractual coupon rate | $ | 1.0 |  |  | $ | 1.0 |  | $ | 3.0 |  |  | $ | 7.6 |
Amortization of debt issuance costs | 0.2 |  |  | 0.1 |  | 0.4 |  |  | 0.9 |
Total interest expense | $ | 1.2 |  |  | $ | 1.1 |  | $ | 3.4 |  |  | $ | 8.5 |

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