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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Operating leases: |  |  |
Operating lease right-of-use assets | $ 119.3 | $ 61.9 | $ 26.9
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 | $ 32.4 | $ 17.3 |
Operating lease liabilities, less current portion | 86.7 | 47.7 |
Total lease liabilities | $ 119.1 | $ 65.0 |
Finance leases: |  |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, plant, equipment and mine development, net | Property, plant, equipment and mine development, net |
Property, plant, equipment and mine development | $ 46.8 | $ 34.3 |
Accumulated depreciation | (22.8) | (15.4) |
Property, plant, equipment and mine development, net | $ 24.0 | $ 18.9 |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Less: Current portion of long-term debt | Less: Current portion of long-term debt |
Current portion of long-term debt | $ 15.8 | $ 13.5 |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-Term Debt and Lease Obligation | Long-Term Debt and Lease Obligation |
Long-term debt, less current portion | $ 9.3 | $ 8.8 |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Long-Term Debt and Lease Obligation [Member] | Long-Term Debt and Lease Obligation [Member] |
Total finance lease liabilities | $ 25.1 | $ 22.3 |
Weighted average remaining lease term (years) |  |  |
Operating leases | 4 years | 4 years 7 months 6 days |
Finance leases | 5 years 2 months 12 days | 2 years 3 months 18 days |
Weighted average discount rate |  |  |
Operating leases | 7.10% | 6.80% |
Finance leases | 6.20% | 6.80% |
Operating Leased Assets [Line Items] |  |  |
Long-term debt, less current portion | $ 9.3 | $ 8.8 |
Current portion of long-term debt | 15.8 | 13.5 |
Operating lease liabilities | $ 32.4 | $ 17.3 |

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