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Leases (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Components of Lease Expense
The components of lease expense during the three and nine months ended September 30, 2021 and 2020 were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(Dollars in millions)
Operating lease cost:
Operating lease cost$4.6 $6.3 $15.3 $23.3 
Short-term lease cost4.1 10.2 10.5 31.7 
Variable lease cost1.0 1.1 2.0 3.7 
Sublease income(0.5)— (1.5)— 
Total operating lease cost$9.2 $17.6 $26.3 $58.7 
Finance lease cost:
Amortization of right-of-use assets$1.6 $0.8 $3.7 $5.2 
Interest on lease liabilities0.8 0.2 2.0 0.5 
Total finance lease cost$2.4 $1.0 $5.7 $5.7 
Schedule of Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases at September 30, 2021 and December 31, 2020 was as follows:
September 30, 2021December 31, 2020
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets$38.4 $49.9 
Accounts payable and accrued expenses$17.0 $24.5 
Operating lease liabilities, less current portion31.6 42.1 
Total operating lease liabilities$48.6 $66.6 
Finance leases:
Property, plant, equipment and mine development$31.3 $20.4 
Accumulated depreciation(5.8)(2.5)
Property, plant, equipment and mine development, net$25.5 $17.9 
Current portion of long-term debt$15.5 $21.5 
Long-term debt, less current portion14.9 5.8 
Total finance lease liabilities$30.4 $27.3 
Weighted average remaining lease term (years)
Operating leases3.1
Finance leases6.7
Weighted average discount rate
Operating leases6.8 %
Finance leases8.8 %
Schedule of Supplemental Cash Flow Information Related to Leases
Supplemental cash flow information related to leases during the three and nine months ended September 30, 2021 and 2020 was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases$4.7 $6.8 $17.6 $26.4 
Operating cash flows for finance leases1.1 0.1 2.9 0.5 
Financing cash flows for finance leases2.8 0.2 5.6 8.1 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases— 0.2 6.8 2.3 
Finance leases1.1 0.5 21.3 1.5 
Lessee, Operating Lease, Liability, Maturity The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2021$6.6 $2.8 
202218.4 11.1 
202316.8 5.6 
20246.0 4.7 
20253.4 4.5 
2026 and thereafter3.8 9.5 
Total lease payments55.0 38.2 
Less imputed interest(6.4)(7.8)
Total lease liabilities$48.6 $30.4 
Finance Lease, Liability, Maturity The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2021$6.6 $2.8 
202218.4 11.1 
202316.8 5.6 
20246.0 4.7 
20253.4 4.5 
2026 and thereafter3.8 9.5 
Total lease payments55.0 38.2 
Less imputed interest(6.4)(7.8)
Total lease liabilities$48.6 $30.4