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Long-term Debt (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The Company’s total indebtedness as of September 30, 2025 and December 31, 2024 consisted of the following:
Debt Instrument (defined below, as applicable) | September 30, 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 | — |  |  | 9.3 |
Finance lease obligations | 22.1 |  |  | 25.1 |
Less: Debt issuance costs | (4.8) |  |  | (6.3) |
| 337.3 |  |  | 348.1 |
Less: Current portion of long-term debt | 15.5 |  |  | 15.8 |
Long-term debt | $ | 321.8 |  |  | $ | 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 September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (Dollars in millions)
2028 Convertible Notes | $ | 2.6 |  |  | $ | 2.6 |  |  | $ | 7.8 |  |  | $ | 7.8 |
Financial assurance instruments | 6.2 |  |  | 5.8 |  |  | 19.8 |  |  | 20.7 |
Amortization of debt issuance costs | 1.4 |  |  | 0.6 |  |  | 4.2 |  |  | 4.0 |
Receivables securitization program | 0.6 |  |  | 0.5 |  |  | 1.8 |  |  | 1.9 |
Finance lease obligations | 0.4 |  |  | 0.4 |  |  | 1.1 |  |  | 1.3 |
Capitalized interest | (2.0) |  |  | (2.7) |  |  | (5.9) |  |  | (4.4) |
Other | 0.8 |  |  | 2.5 |  |  | 3.8 |  |  | 3.8 |
Interest expense, net of capitalized interest | $ | 10.0 |  |  | $ | 9.7 |  |  | $ | 32.6 |  |  | $ | 35.1 |
Cash paid for interest, net of capitalized interest | $ | 10.9 |  |  | $ | 8.5 |  |  | $ | 35.0 |  |  | $ | 32.6 |
Non-cash interest expense | $ | 0.9 |  |  | $ | 0.8 |  |  | $ | 4.2 |  |  | $ | 4.0 |

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