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Debt and Financing Obligations (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Schedule of long-term debt instruments | Total debt and financing obligations consisted of the following:
| December 31,
| 2022 |  | 2021
| (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 |  |  | 115.0 |
5.346 percent financing obligation, due 2024 | 8.8 |  |  | 12.0 |
Total borrowings | $ | 543.8 |  |  | $ | 627.0 |
Debt issuance costs | (11.6) |  |  | (13.4) |
Total debt and financing obligation | $ | 532.2 |  |  | $ | 613.6 |
Less: current portion of long-term debt and financing obligation | 3.3 |  |  | 3.2 |
Total long-term debt and financing obligation | $ | 528.9 |  |  | $ | 610.4 |
Schedule of maturities of long-term debt | As of December 31, 2022, the combined aggregate amount of maturities for long-term borrowings for each of the next five years is as follows:
| (Dollars in millions)
2023 | $ | 3.3 |
2024 | 5.5 |
2025 | — |
2026 | 35.0 |
2027 | — |
2028-Thereafter | 500.0 |
Total | $ | 543.8 |

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