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Leases - Supplemental Balance Sheeet Information (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating leases: |  |
Operating lease right-of-use assets | $ 93.1 | $ 0.0
Operating lease liabilities, less current portion | (58.0) | 0.0
Total operating lease liabilities | (87.4) |
Finance leases: |  |
Accumulated depreciation | (1,267.3) | (957.4)
Property, plant, equipment and mine development, net | 4,974.8 | 5,207.0
Current portion of long-term debt | 28.5 | 36.5
Long-term debt | 1,327.1 | 1,330.5
Total finance lease liabilities | 24.5 | $ 40.0
Operating leases |  |
Operating leases: |  |
Operating lease right-of-use assets | 93.1 |
Accounts payable and accrued expenses | (29.4) |
Operating lease liabilities, less current portion | (58.0) |
Total operating lease liabilities | $ (87.4) |
Weighted average remaining lease term (years) |  |
Operating leases | 4 years 1 month 6 days |
Weighted average discount rate |  |
Operating leases | 7.40% |
Finance leases |  |
Finance leases: |  |
Property, plant, equipment and mine development | $ 96.8 |
Accumulated depreciation | (47.8) |
Property, plant, equipment and mine development, net | 49.0 |
Current portion of long-term debt | 24.5 |
Long-term debt | 0.0 |
Total finance lease liabilities | $ 24.5 |
Weighted average remaining lease term (years) |  |
Finance leases | 8 months 12 days |
Weighted average discount rate |  |
Finance leases | 5.90% |

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