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Debt and Financing Obligation (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Schedule of Total Debt and Financing Obligation | Total debt and financing obligation, including the current portion of the financing obligation, consisted of the following:
|  | September 30, 2023 |  | December 31, 2022
|  | (Dollars in millions)
4.875 percent senior notes, due 2029 (“2029 Senior Notes”) |  | $ | 500.0 |  |  | $ | 500.0 |
$350.0 revolving credit facility, due 2026 (“Revolving Facility”) |  | — |  |  | 35.0 |
5.346 percent financing obligation, due 2024 |  | 6.3 |  |  | 8.8 |
Total borrowings |  | $ | 506.3 |  |  | $ | 543.8 |
Debt issuance costs |  | (10.2) |  |  | (11.6) |
Total debt and financing obligation |  | $ | 496.1 |  |  | $ | 532.2 |
Less: current portion of financing obligation |  | 6.3 |  |  | 3.3 |
Total long-term debt and financing obligation |  | $ | 489.8 |  |  | $ | 528.9 |

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