v3.26.3
Long-term Debt (Tables)
 9 Months Ended
Sep. 30, 2026
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company’s total indebtedness as of September 30, 2026 and December 31, 2025 consisted of the following:
Debt Instrument (defined below, as applicable)September 30, 2026December 31, 2025
(Dollars in millions)
2028 Convertible Notes, including bifurcated conversion option and debt discount$37.1 $320.0 
0.50% Convertible Senior Notes due June 2031 (2031 Convertible Notes)
250.0 — 
Finance lease obligations16.2 20.8 
Less: Debt issuance costs(6.7)(4.4)
296.6 336.4 
Less: Current portion of long-term debt49.0 15.2 
Long-term debt$247.6 $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 September 30,Nine Months Ended September 30,
2026202520262025
(Dollars in millions)
2028 Convertible Notes, coupon rate$0.6 $2.6 $5.2 $7.8 
2028 Convertible Notes, accretion of debt discount4.4 — 4.4 — 
2031 Convertible Notes, coupon rate0.3 — 0.4 — 
Finance lease obligations0.2 0.4 0.9 1.1 
Financial assurance instruments7.9 6.2 20.8 19.8 
Amortization of debt issuance costs1.5 1.4 4.3 4.2 
Receivables securitization program0.6 0.6 1.8 1.8 
Capitalized interest— (2.0)(2.1)(5.9)
Other3.1 0.8 6.3 3.8 
Interest expense, net of capitalized interest$18.6 $10.0 $42.0 $32.6 
Cash paid for interest, net of capitalized interest$7.8 $10.9 $41.1 $35.0 
Non-cash interest expense$5.9 $0.9 $8.7 $4.2