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Leases (Tables)
 12 Months Ended
Dec. 31, 2025
Leases [Abstract]  
Components of Lease Expense
The components of lease expense for the periods presented below were as follows:
Year Ended December 31,
202520242023
(Dollars in millions)
Operating lease cost:
Operating leases$34.3 $36.9 $22.1 
Short-term leases26.1 32.7 44.3 
Variable leases5.0 4.7 8.7 
Sublease income(0.2)(0.6)(1.4)
Total operating lease cost$65.2 $73.7 $73.7 
Finance lease cost:
Amortization of right-of-use assets$9.4 $8.8 $7.2 
Interest on lease liabilities1.5 1.8 1.7 
Total finance lease cost$10.9 $10.6 $8.9 
Schedule of Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases at December 31, 2025 and 2024 was as follows:
December 31,
20252024
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets$121.2 $119.3 
Accounts payable and accrued expenses$36.0 $32.4 
Operating lease liabilities, less current portion87.5 86.7 
Total operating lease liabilities$123.5 $119.1 
Finance leases:
Property, plant, equipment and mine development$40.7 $46.8 
Accumulated depreciation(25.1)(22.8)
Property, plant, equipment and mine development, net$15.6 $24.0 
Current portion of long-term debt$15.2 $15.8 
Long-term debt, less current portion5.6 9.3 
Total finance lease liabilities$20.8 $25.1 
Weighted average remaining lease term (years)
Operating leases4.04.0
Finance leases1.85.2
Weighted average discount rate
Operating leases7.5 %7.1 %
Finance leases6.2 %6.2 %
Schedule of Supplemental Cash Flow Information Related to Leases
Supplemental cash flow information related to leases for the periods presented below was as follows:
Year Ended December 31,
202520242023
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases$34.9 $34.1 $18.8 
Operating cash flows for finance leases1.5 1.8 1.7 
Financing cash flows for finance leases12.2 10.4 9.0 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases58.9 84.9 55.6 
Finance leases4.6 14.4 6.7 
Lessee, Operating Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 8.0 years, and may include options to extend the terms, as applicable. The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2026$41.4 $14.9 
202734.6 5.3 
202829.0 1.7 
202918.8 0.4 
203012.1 0.1 
2030 and thereafter2.5 — 
Total lease payments138.4 22.4 
Less imputed interest(14.9)(1.6)
Total lease liabilities$123.5 $20.8 
Finance Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 8.0 years, and may include options to extend the terms, as applicable. The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2026$41.4 $14.9 
202734.6 5.3 
202829.0 1.7 
202918.8 0.4 
203012.1 0.1 
2030 and thereafter2.5 — 
Total lease payments138.4 22.4 
Less imputed interest(14.9)(1.6)
Total lease liabilities$123.5 $20.8