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Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The Company’s total indebtedness as of December 31, 2024 and 2023 consisted of the following:
| December 31,
Debt Instrument (defined below, as applicable) | 2024 |  | 2023
| (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 | 25.1 |  |  | 22.3 |
Less: Debt issuance costs | (6.3) |  |  | (8.1) |
| 348.1 |  |  | 334.2 |
Less: Current portion of long-term debt | 15.8 |  |  | 13.5 |
Long-term debt | $ | 332.3 |  |  | $ | 320.7 |
Interest Income and Interest Expense Disclosure | The following table presents the components of the Company’s interest expense related to its indebtedness and financial assurance instruments such as surety bonds and letters of credit. 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.
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (Dollars in millions)
2028 Convertible Notes | $ | 10.4 |  |  | $ | 10.4 |  |  | $ | 8.7 |
Debt retired during 2022 | — |  |  | — |  |  | 51.5 |
Finance lease obligations | 1.8 |  |  | 1.8 |  |  | 2.1 |
Financial assurance instruments | 27.3 |  |  | 38.2 |  |  | 53.3 |
Amortization of debt issuance costs | 5.4 |  |  | 3.6 |  |  | 17.3 |
Receivables securitization program | 2.6 |  |  | 3.6 |  |  | 3.8 |
Capitalized interest | (5.8) |  |  | — |  |  | — |
Other | 5.2 |  |  | 2.2 |  |  | 3.6 |
Interest expense, net of capitalized interest | $ | 46.9 |  |  | $ | 59.8 |  |  | $ | 140.3 |
Cash paid for interest, net of capitalized interest | $ | 37.6 |  |  | $ | 61.9 |  |  | $ | 118.5 |
Non-cash interest expense | $ | 5.4 |  |  | $ | 4.6 |  |  | $ | 17.7 |

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