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Long-term Debt (Tables)
 9 Months Ended
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, 2025December 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 obligations22.1 25.1 
Less: Debt issuance costs(4.8)(6.3)
337.3 348.1 
Less: Current portion of long-term debt15.5 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,
2025202420252024
 (Dollars in millions)
2028 Convertible Notes$2.6 $2.6 $7.8 $7.8 
Financial assurance instruments6.2 5.8 19.8 20.7 
Amortization of debt issuance costs1.4 0.6 4.2 4.0 
Receivables securitization program0.6 0.5 1.8 1.9 
Finance lease obligations0.4 0.4 1.1 1.3 
Capitalized interest(2.0)(2.7)(5.9)(4.4)
Other0.8 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