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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Operating leases: |  |  |
Operating lease right-of-use assets | $ 35.5 | $ 49.9 | $ 82.4
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Accounts Payable and Accrued Liabilities, Current | Accounts Payable and Accrued Liabilities, Current |
Accounts payable and accrued expenses | $ 16.4 | $ 24.5 |
Operating lease liabilities, less current portion | 27.2 | 42.1 |
Total operating lease liabilities | 43.6 | 66.6 |
Finance leases: |  |  |
Property, plant, equipment and mine development | 32.2 | 20.4 |
Accumulated depreciation | (7.4) | (2.5) |
Property, plant, equipment and mine development, net | $ 24.8 | $ 17.9 |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt |
Total finance lease liabilities | $ 29.3 | $ 27.3 |
Weighted average remaining lease term (years) |  |  |
Operating leases | 3 years |  |
Finance leases | 6 years 8 months 12 days |  |
Weighted average discount rate |  |  |
Operating leases | 6.90% |  |
Finance leases | 8.50% |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease liabilities | $ 16.4 | 24.5 |
Total lease liabilities | 29.3 | 27.3 |
Long-term Debt |  |  |
Finance leases: |  |  |
Current portion of long-term debt | 15.3 | 21.5 |
Long-term debt, less current portion | 14.0 | 5.8 |
Operating Leased Assets [Line Items] |  |  |
Long-term debt, less current portion | 14.0 | 5.8 |
Current portion of long-term debt | $ 15.3 | $ 21.5 |

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