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Leases (Tables)
 3 Months Ended
Mar. 31, 2022
Leases [Abstract]  
Components of Lease Expense
The components of lease expense during the three months ended March 31, 2022 and 2021 were as follows:
Three Months Ended March 31,
20222021
(Dollars in millions)
Operating lease cost:
Operating lease cost$4.7 $6.0 
Short-term lease cost6.3 3.4 
Variable lease cost1.6 0.5 
Sublease income(0.4)(0.5)
Total operating lease cost$12.2 $9.4 
Finance lease cost:
Amortization of right-of-use assets$1.5 $0.6 
Interest on lease liabilities0.6 0.5 
Total finance lease cost$2.1 $1.1 
Schedule of Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases at March 31, 2022 and December 31, 2021 was as follows:
March 31, 2022December 31, 2021
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets$33.0 $35.5 
Accounts payable and accrued expenses$16.1 $16.4 
Operating lease liabilities, less current portion24.6 27.2 
Total operating lease liabilities$40.7 $43.6 
Finance leases:
Property, plant, equipment and mine development$32.4 $32.2 
Accumulated depreciation(9.0)(7.4)
Property, plant, equipment and mine development, net$23.4 $24.8 
Current portion of long-term debt$15.0 $15.3 
Long-term debt, less current portion12.6 14.0 
Total finance lease liabilities$27.6 $29.3 
Weighted average remaining lease term (years)
Operating leases2.9
Finance leases6.7
Weighted average discount rate
Operating leases7.0 %
Finance leases8.2 %
Schedule of Supplemental Cash Flow Information Related to Leases
Supplemental cash flow information related to leases during the three months ended March 31, 2022 and 2021 was as follows:
Three Months Ended March 31,
20222021
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases$5.9 $8.3 
Operating cash flows for finance leases0.6 0.7 
Financing cash flows for finance leases2.2 1.3 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases1.6 3.1 
Finance leases— 3.6 
Lessee, Operating Lease, Liability, Maturity The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2022$13.7 $8.7 
202317.6 6.0 
20246.3 5.1 
20253.6 4.9 
20263.6 2.5 
2027 and thereafter0.8 7.2 
Total lease payments45.6 34.4 
Less imputed interest(4.9)(6.8)
Total lease liabilities$40.7 $27.6 
Finance Lease, Liability, Maturity The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2022$13.7 $8.7 
202317.6 6.0 
20246.3 5.1 
20253.6 4.9 
20263.6 2.5 
2027 and thereafter0.8 7.2 
Total lease payments45.6 34.4 
Less imputed interest(4.9)(6.8)
Total lease liabilities$40.7 $27.6