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Leases (Tables)
 12 Months Ended
Dec. 31, 2024
Leases [Abstract]  
Components of Lease Expense
The components of lease expense for the periods presented below were as follows:
Year Ended December 31,
202420232022
(Dollars in millions)
Operating lease cost:
Operating leases$36.9 $22.1 $18.9 
Short-term leases32.7 44.3 30.6 
Variable leases4.7 8.7 7.6 
Sublease income(0.6)(1.4)(1.3)
Total operating lease cost$73.7 $73.7 $55.8 
Finance lease cost:
Amortization of right-of-use assets$8.8 $7.2 $6.3 
Interest on lease liabilities1.8 1.7 2.1 
Total finance lease cost$10.6 $8.9 $8.4 
Schedule of Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases at December 31, 2024 and 2023 was as follows:
December 31,
20242023
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets$119.3 $61.9 
Accounts payable and accrued expenses$32.4 $17.3 
Operating lease liabilities, less current portion86.7 47.7 
Total operating lease liabilities$119.1 $65.0 
Finance leases:
Property, plant, equipment and mine development$46.8 $34.3 
Accumulated depreciation(22.8)(15.4)
Property, plant, equipment and mine development, net$24.0 $18.9 
Current portion of long-term debt$15.8 $13.5 
Long-term debt, less current portion9.3 8.8 
Total finance lease liabilities$25.1 $22.3 
Weighted average remaining lease term (years)
Operating leases4.04.6
Finance leases5.22.3
Weighted average discount rate
Operating leases7.1 %6.8 %
Finance leases6.2 %6.8 %
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,
202420232022
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases$34.1 $18.8 $20.5 
Operating cash flows for finance leases1.8 1.7 2.1 
Financing cash flows for finance leases10.4 9.0 9.3 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases84.9 55.6 13.5 
Finance leases14.4 6.7 6.4 
Lessee, Operating Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 10 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)
2025$38.2 $16.6 
202634.4 8.0 
202729.0 2.4 
202822.5 0.7 
20295.8 0.1 
2030 and thereafter3.1 — 
Total lease payments133.0 27.8 
Less imputed interest(13.9)(2.7)
Total lease liabilities$119.1 $25.1 
Finance Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 10 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)
2025$38.2 $16.6 
202634.4 8.0 
202729.0 2.4 
202822.5 0.7 
20295.8 0.1 
2030 and thereafter3.1 — 
Total lease payments133.0 27.8 
Less imputed interest(13.9)(2.7)
Total lease liabilities$119.1 $25.1