v3.26.1
Long-term Debt (Tables)
 3 Months Ended
Mar. 31, 2026
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company’s total indebtedness as of March 31, 2026 and December 31, 2025 consisted of the following:
Debt Instrument (defined below, as applicable)March 31, 2026December 31, 2025
(Dollars in millions)
3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
$320.0 $320.0 
Finance lease obligations19.1 20.8 
Less: Debt issuance costs(3.9)(4.4)
335.2 336.4 
Less: Current portion of long-term debt14.3 15.2 
Long-term debt$320.9 $321.2 
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,
20262025
 (Dollars in millions)
2028 Convertible Notes$2.6 $2.6 
Finance lease obligations0.3 0.4 
Financial assurance instruments6.7 7.2 
Amortization of debt issuance costs1.4 1.4 
Receivables securitization program0.6 0.6 
Capitalized interest(2.1)(2.2)
Other1.2 1.5 
Interest expense, net of capitalized interest$10.7 $11.5 
Cash paid for interest, net of capitalized interest$9.9 $9.9 
Non-cash interest expense$1.4 $1.6