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Long-term Debt (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The Company’s total indebtedness as of September 30, 2023 and December 31, 2022 consisted of the following:
Debt Instrument (defined below, as applicable) | September 30, 2023 |  | December 31, 2022
| (Dollars in millions)
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes) | $ | 320.0 |  |  | $ | 320.0 |
Finance lease obligations | 22.1 |  |  | 23.6 |
Less: Debt issuance costs | (8.5) |  |  | (9.8) |
| 333.6 |  |  | 333.8 |
Less: Current portion of long-term debt | 12.7 |  |  | 13.2 |
Long-term debt | $ | 320.9 |  |  | $ | 320.6 |
Schedule of Interest Charges | Additionally, the table sets forth the amount of cash paid for 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,
| 2023 |  | 2022 |  | 2023 |  | 2022
| (Dollars in millions)
Indebtedness | $ | 4.9 |  |  | $ | 20.8 |  |  | $ | 16.6 |  |  | $ | 70.7 |
Financial assurance instruments | 8.9 |  |  | 13.0 |  |  | 28.9 |  |  | 40.1 |
Interest expense | $ | 13.8 |  |  | $ | 33.8 |  |  | $ | 45.5 |  |  | $ | 110.8 |
Cash paid for interest | $ | 14.8 |  |  | $ | 26.4 |  |  | $ | 56.7 |  |  | $ | 104.2 |
Non-cash interest expense | $ | 0.7 |  |  | $ | 4.6 |  |  | $ | 4.0 |  |  | $ | 13.6 |

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