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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
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 portion | 42.1 | 52.8
Total operating lease liabilities | $ 66.6 | $ 82.4
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
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 portion | 5.8 | 0.9
Total finance lease liabilities | $ 27.3 | $ 15.2
Weighted average remaining lease term (years) |  |
Operating leases | 3 years 4 months 24 days | 3 years 9 months 18 days
Finance leases | 9 years | 7 months 6 days
Weighted average discount rate |  |
Operating leases | 6.80% | 7.30%
Finance leases | 11.20% | 6.00%

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