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Long-term Debt (Tables)
 3 Months Ended
Mar. 31, 2025
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company’s total indebtedness as of March 31, 2025 and December 31, 2024 consisted of the following:
Debt Instrument (defined below, as applicable)March 31, 2025December 31, 2024
(Dollars in millions)
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
$320.0 $320.0 
BUMA Loan Note9.5 9.3 
Finance lease obligations23.5 25.1 
Less: Debt issuance costs(5.8)(6.3)
347.2 348.1 
Less: Current portion of long-term debt16.0 15.8 
Long-term debt$331.2 $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 March 31,
20252024
 (Dollars in millions)
2028 Convertible Notes$2.6 $2.6 
Finance lease obligations0.4 0.4 
Financial assurance instruments7.2 8.8 
Amortization of debt issuance costs1.4 1.2 
Receivables securitization program0.6 0.8 
Capitalized interest(2.2)— 
Other1.5 0.9 
Interest expense, net of capitalized interest$11.5 $14.7 
Cash paid for interest, net of capitalized interest$9.9 $11.5 
Non-cash interest expense$1.6 $1.3