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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Operating leases: |  |
Operating lease right-of-use assets | $ 50.7 | $ 82.4
Accounts payable and accrued expenses | 24.9 | 29.6
Operating lease liabilities, less current portion | 42.0 | 52.8
Total operating lease liabilities | 66.9 | 82.4
Finance leases: |  |
Property, plant, equipment and mine development | 44.2 | 89.6
Accumulated depreciation | (27.6) | (45.9)
Property, plant, equipment and mine development, net | 16.6 | 43.7
Current portion of long-term debt | 6.9 | 14.3
Long-term debt, less current portion | 1.0 | 0.9
Total finance lease liabilities | $ 7.9 | $ 15.2
Weighted average remaining lease term (years) |  |
Operating leases | 3 years 7 months 6 days |
Finance leases | 17 years 3 months 18 days |
Weighted average discount rate |  |
Operating leases | 7.40% |
Finance leases | 6.20% |

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