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Leases (Tables) | 9 Months Ended
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Sep. 30, 2021
Leases [Abstract] |
Components of Lease Expense | The components of lease expense during the three and nine months ended September 30, 2021 and 2020 were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (Dollars in millions)
Operating lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 4.6 |  |  | $ | 6.3 |  |  | $ | 15.3 |  |  | $ | 23.3 |
Short-term lease cost | 4.1 |  |  | 10.2 |  |  | 10.5 |  |  | 31.7 |
Variable lease cost | 1.0 |  |  | 1.1 |  |  | 2.0 |  |  | 3.7 |
Sublease income | (0.5) |  |  | — |  |  | (1.5) |  |  | — |
Total operating lease cost | $ | 9.2 |  |  | $ | 17.6 |  |  | $ | 26.3 |  |  | $ | 58.7 |
Finance lease cost: |  |  |  |  |  |  |
Amortization of right-of-use assets | $ | 1.6 |  |  | $ | 0.8 |  |  | $ | 3.7 |  |  | $ | 5.2 |
Interest on lease liabilities | 0.8 |  |  | 0.2 |  |  | 2.0 |  |  | 0.5 |
Total finance lease cost | $ | 2.4 |  |  | $ | 1.0 |  |  | $ | 5.7 |  |  | $ | 5.7 |
Schedule of Supplemental Balance Sheet Information Related to Leases | Supplemental balance sheet information related to leases at September 30, 2021 and December 31, 2020 was as follows:
| September 30, 2021 |  | December 31, 2020
| (Dollars in millions)
Operating leases: |  |  |
Operating lease right-of-use assets | $ | 38.4 |  |  | $ | 49.9 |
Accounts payable and accrued expenses | $ | 17.0 |  |  | $ | 24.5 |
Operating lease liabilities, less current portion | 31.6 |  |  | 42.1 |
Total operating lease liabilities | $ | 48.6 |  |  | $ | 66.6 |
Finance leases: |  |  |
Property, plant, equipment and mine development | $ | 31.3 |  |  | $ | 20.4 |
Accumulated depreciation | (5.8) |  |  | (2.5) |
Property, plant, equipment and mine development, net | $ | 25.5 |  |  | $ | 17.9 |
Current portion of long-term debt | $ | 15.5 |  |  | $ | 21.5 |
Long-term debt, less current portion | 14.9 |  |  | 5.8 |
Total finance lease liabilities | $ | 30.4 |  |  | $ | 27.3 |
Weighted average remaining lease term (years) |  |  |
Operating leases | 3.1 |  |
Finance leases | 6.7 |  |
Weighted average discount rate |  |  |
Operating leases | 6.8 | % |  |
Finance leases | 8.8 | % |  |
Schedule of Supplemental Cash Flow Information Related to Leases | Supplemental cash flow information related to leases during the three and nine months ended September 30, 2021 and 2020 was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows for operating leases | $ | 4.7 |  |  | $ | 6.8 |  |  | $ | 17.6 |  |  | $ | 26.4 |
Operating cash flows for finance leases | 1.1 |  |  | 0.1 |  |  | 2.9 |  |  | 0.5 |
Financing cash flows for finance leases | 2.8 |  |  | 0.2 |  |  | 5.6 |  |  | 8.1 |
Right-of-use assets obtained in exchange for lease obligations: |  |  |  |  |  |  |
Operating leases | — |  |  | 0.2 |  |  | 6.8 |  |  | 2.3 |
Finance leases | 1.1 |  |  | 0.5 |  |  | 21.3 |  |  | 1.5 |
Lessee, Operating Lease, Liability, Maturity | The contractual maturities of lease liabilities were as follows:
Period Ending December 31, |  | Operating Leases |  | Finance Leases
|  | (Dollars in millions)
2021 |  | $ | 6.6 |  |  | $ | 2.8 |
2022 |  | 18.4 |  |  | 11.1 |
2023 |  | 16.8 |  |  | 5.6 |
2024 |  | 6.0 |  |  | 4.7 |
2025 |  | 3.4 |  |  | 4.5 |
2026 and thereafter |  | 3.8 |  |  | 9.5 |
Total lease payments |  | 55.0 |  |  | 38.2 |
Less imputed interest |  | (6.4) |  |  | (7.8) |
Total lease liabilities |  | $ | 48.6 |  |  | $ | 30.4 |
Finance Lease, Liability, Maturity | The contractual maturities of lease liabilities were as follows:
Period Ending December 31, |  | Operating Leases |  | Finance Leases
|  | (Dollars in millions)
2021 |  | $ | 6.6 |  |  | $ | 2.8 |
2022 |  | 18.4 |  |  | 11.1 |
2023 |  | 16.8 |  |  | 5.6 |
2024 |  | 6.0 |  |  | 4.7 |
2025 |  | 3.4 |  |  | 4.5 |
2026 and thereafter |  | 3.8 |  |  | 9.5 |
Total lease payments |  | 55.0 |  |  | 38.2 |
Less imputed interest |  | (6.4) |  |  | (7.8) |
Total lease liabilities |  | $ | 48.6 |  |  | $ | 30.4 |

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