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Long-term Debt (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The Company’s total indebtedness as of March 31, 2025 and December 31, 2024 consisted of the following:
Debt Instrument (defined below, as applicable) | March 31, 2025 |  | December 31, 2024
| (Dollars in millions)
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) | $ | 320.0 |  |  | $ | 320.0 |
BUMA Loan Note | 9.5 |  |  | 9.3 |
Finance lease obligations | 23.5 |  |  | 25.1 |
Less: Debt issuance costs | (5.8) |  |  | (6.3) |
| 347.2 |  |  | 348.1 |
Less: Current portion of long-term debt | 16.0 |  |  | 15.8 |
Long-term debt | $ | 331.2 |  |  | $ | 332.3 |
Schedule of Interest Charges | Additionally, the table sets forth the amount of cash paid for interest, net of capitalized interest and the amount of non-cash interest expense primarily related to the amortization of debt issuance costs.
|  |  | Three Months Ended March 31,
|  |  |  |  | 2025 |  | 2024
|  |  |  |  | (Dollars in millions)
2028 Convertible Notes |  |  |  |  | $ | 2.6 |  |  | $ | 2.6 |
Finance lease obligations |  |  |  |  | 0.4 |  |  | 0.4 |
Financial assurance instruments |  |  |  |  | 7.2 |  |  | 8.8 |
Amortization of debt issuance costs |  |  |  |  | 1.4 |  |  | 1.2 |
Receivables securitization program |  |  |  |  | 0.6 |  |  | 0.8 |
Capitalized interest |  |  |  |  | (2.2) |  |  | — |
Other |  |  |  |  | 1.5 |  |  | 0.9 |
Interest expense, net of capitalized interest |  |  |  |  | $ | 11.5 |  |  | $ | 14.7 |
Cash paid for interest, net of capitalized interest |  |  |  |  | $ | 9.9 |  |  | $ | 11.5 |
Non-cash interest expense |  |  |  |  | $ | 1.6 |  |  | $ | 1.3 |

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