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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Components of Lease Expense
The components of lease expense during the years ended December 31, 2020 and 2019 were as follows:
Year Ended December 31,
20202019
(Dollars in millions)
Operating lease cost:
Operating leases$28.8 $43.3 
Short-term leases39.1 49.7 
Variable leases4.6 19.1 
Sublease income(2.3)(2.6)
Total operating lease cost$70.2 $109.5 
Finance lease cost:
Amortization of right-of-use assets$3.5 $15.3 
Interest on lease liabilities0.8 1.5 
Total finance lease cost$4.3 $16.8 
Schedule of Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases at December 31, 2020 and 2019 was as follows:
December 31,
20202019
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets$49.9 $82.4 
Accounts payable and accrued expenses$24.5 $29.6 
Operating lease liabilities, less current portion42.1 52.8 
Total operating lease liabilities$66.6 $82.4 
Finance leases:
Property, plant, equipment and mine development$20.4 $89.6 
Accumulated depreciation(2.5)(45.9)
Property, plant, equipment and mine development, net$17.9 $43.7 
Current portion of long-term debt$21.5 $14.3 
Long-term debt, less current portion5.8 0.9 
Total finance lease liabilities$27.3 $15.2 
Weighted average remaining lease term (years)
Operating leases3.43.8
Finance leases9.00.6
Weighted average discount rate
Operating leases6.8 %7.3 %
Finance leases11.2 %6.0 %
Schedule of Supplemental Cash Flow Information Related to Leases
Supplemental cash flow information related to leases during the years ended December 31, 2020 and 2019 was as follows:
Year Ended December 31,
20202019
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases$35.1 $51.0 
Operating cash flows for finance leases0.8 1.5 
Financing cash flows for finance leases8.9 29.6 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases16.5 16.6 
Finance leases1.6 1.6 
Lessee, Operating Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 21.0 years, some of which include options to extend the terms deemed reasonably certain of exercise. The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2021$24.8 $17.1 
202217.6 5.8 
202316.8 1.5 
20246.0 0.7 
20253.4 0.5 
2026 and thereafter3.8 7.7 
Total lease payments72.4 33.3 
Less imputed interest(5.8)(6.0)
Total lease liabilities$66.6 $27.3 
Finance Lease, Liability, Maturity
The Company's leases have remaining lease terms ranging from 1 year to 21.0 years, some of which include options to extend the terms deemed reasonably certain of exercise. The contractual maturities of lease liabilities were as follows:
Period Ending December 31,Operating LeasesFinance Leases
 (Dollars in millions)
2021$24.8 $17.1 
202217.6 5.8 
202316.8 1.5 
20246.0 0.7 
20253.4 0.5 
2026 and thereafter3.8 7.7 
Total lease payments72.4 33.3 
Less imputed interest(5.8)(6.0)
Total lease liabilities$66.6 $27.3