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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Operating leases: |  |  |
Operating lease right-of-use assets | $ 61.9 | $ 26.9 | $ 35.5
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 | $ 17.3 | $ 16.8 |
Operating lease liabilities, less current portion | 47.7 | 11.0 |
Total operating lease liabilities | 65.0 | 27.8 |
Finance leases: |  |  |
Property, plant, equipment and mine development | 34.3 | 36.1 |
Accumulated depreciation | (15.4) | (12.6) |
Property, plant, equipment and mine development, net | $ 18.9 | $ 23.5 |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Long-Term Debt and Lease Obligation | Long-Term Debt and Lease Obligation |
Total finance lease liabilities | $ 22.3 | $ 23.6 |
Weighted average remaining lease term (years) |  |  |
Operating leases | 4 years 7 months 6 days |  |
Finance leases | 2 years 3 months 18 days |  |
Weighted average discount rate |  |  |
Operating leases | 6.80% |  |
Finance leases | 6.80% |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease liabilities | $ 17.3 | 16.8 |
Long-term Debt |  |  |
Finance leases: |  |  |
Current portion of long-term debt | 13.5 | 13.2 |
Long-term debt, less current portion | 8.8 | 10.4 |
Operating Leased Assets [Line Items] |  |  |
Long-term debt, less current portion | 8.8 | 10.4 |
Current portion of long-term debt | $ 13.5 | $ 13.2 |

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