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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
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 portion | 31.6 | 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 portion | 14.9 | 5.8
Total finance lease liabilities | $ 30.4 | $ 27.3
Weighted average remaining lease term (years) |  |
Operating leases | 3 years 1 month 6 days |
Finance leases | 6 years 8 months 12 days |
Weighted average discount rate |  |
Operating leases | 6.80% |
Finance leases | 8.80% |

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