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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2025
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company’s total indebtedness as of December 31, 2025 and 2024 consisted of the following:
December 31,
Debt Instrument (defined below, as applicable)20252024
(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 obligations20.8 25.1 
Less: Debt issuance costs(4.4)(6.3)
336.4 348.1 
Less: Current portion of long-term debt15.2 15.8 
Long-term debt$321.2 $332.3 
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,
202520242023
(Dollars in millions)
2028 Convertible Notes$10.4 $10.4 $10.4 
Finance lease obligations1.5 1.8 1.8 
Financial assurance instruments26.4 27.3 38.2 
Amortization of debt issuance costs5.6 5.4 3.6 
Receivables securitization program2.4 2.6 3.6 
Capitalized interest(8.0)(5.8)— 
Other5.6 5.2 2.2 
Interest expense, net of capitalized interest$43.9 $46.9 $59.8 
Cash paid for interest, net of capitalized interest$39.5 $37.6 $61.9 
Non-cash interest expense$5.6 $5.4 $4.6