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Long-term Debt (Tables) | 6 Months Ended
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Jun. 30, 2024
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The Company’s total indebtedness as of June 30, 2024 and December 31, 2023 consisted of the following:
Debt Instrument (defined below, as applicable) | June 30, 2024 |  | December 31, 2023
| (Dollars in millions)
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) | $ | 320.0 |  |  | $ | 320.0 |
Finance lease obligations | 24.5 |  |  | 22.3 |
Less: Debt issuance costs | (7.2) |  |  | (8.1) |
| 337.3 |  |  | 334.2 |
Less: Current portion of long-term debt | 14.1 |  |  | 13.5 |
Long-term debt | $ | 323.2 |  |  | $ | 320.7 |
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 June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (Dollars in millions)
2028 Convertible Notes | $ | 2.6 |  |  | $ | 2.6 |  |  | $ | 5.2 |  |  | $ | 5.2 |
Finance lease obligations | 0.5 |  |  | 0.4 |  |  | 0.9 |  |  | 0.9 |
Financial assurance instruments | 6.1 |  |  | 8.0 |  |  | 14.9 |  |  | 20.0 |
Amortization of debt issuance costs | 2.0 |  |  | 0.7 |  |  | 3.2 |  |  | 2.3 |
Capitalized interest | (1.7) |  |  | — |  |  | (1.7) |  |  | — |
Other | 1.2 |  |  | 1.6 |  |  | 2.9 |  |  | 3.3 |
Interest expense, net of capitalized interest | $ | 10.7 |  |  | $ | 13.3 |  |  | $ | 25.4 |  |  | $ | 31.7 |
Cash paid for interest, net of capitalized interest | $ | 12.6 |  |  | $ | 22.9 |  |  | $ | 24.1 |  |  | $ | 41.9 |
Non-cash interest expense | $ | 1.9 |  |  | $ | 1.7 |  |  | $ | 3.2 |  |  | $ | 3.3 |

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