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Leases (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Components of Lease Expense
The components of lease expense for the periods presented below were as follows:
Year Ended December 31,
202320222021
(Dollars in millions)
Operating lease cost:
Operating leases$22.1 $18.9 $19.8 
Short-term leases44.3 30.6 15.5 
Variable leases8.7 7.6 2.7 
Sublease income(1.4)(1.3)(1.9)
Total operating lease cost$73.7 $55.8 $36.1 
Finance lease cost:
Amortization of right-of-use assets$7.2 $6.3 $5.9 
Interest on lease liabilities1.7 2.1 2.7 
Total finance lease cost$8.9 $8.4 $8.6 
Schedule of Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases at December 31, 2023 and 2022 was as follows:
December 31,
20232022
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets$61.9 $26.9 
Accounts payable and accrued expenses$17.3 $16.8 
Operating lease liabilities, less current portion47.7 11.0 
Total operating lease liabilities$65.0 $27.8 
Finance leases:
Property, plant, equipment and mine development$34.3 $36.1 
Accumulated depreciation(15.4)(12.6)
Property, plant, equipment and mine development, net$18.9 $23.5 
Current portion of long-term debt$13.5 $13.2 
Long-term debt, less current portion8.8 10.4 
Total finance lease liabilities$22.3 $23.6 
Weighted average remaining lease term (years)
Operating leases4.6
Finance leases2.3
Weighted average discount rate
Operating leases6.8 %
Finance leases6.8 %
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,
202320222021
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases$18.8 $20.5 $24.3 
Operating cash flows for finance leases1.7 2.1 3.8 
Financing cash flows for finance leases9.0 9.3 8.2 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases55.6 13.5 7.1 
Finance leases6.7 6.4 24.4 
Lessee, Operating Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 9 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)
2024$19.0 $14.3 
202515.0 5.8 
202614.7 3.0 
202713.2 1.7 
20287.5 0.2 
2029 and thereafter4.2 — 
Total lease payments73.6 25.0 
Less imputed interest(8.6)(2.7)
Total lease liabilities$65.0 $22.3 
Finance Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 9 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)
2024$19.0 $14.3 
202515.0 5.8 
202614.7 3.0 
202713.2 1.7 
20287.5 0.2 
2029 and thereafter4.2 — 
Total lease payments73.6 25.0 
Less imputed interest(8.6)(2.7)
Total lease liabilities$65.0 $22.3