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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Components of Lease Expense | The components of lease expense during the years ended December 31, 2020 and 2019 were as follows:
| Year Ended December 31,
| 2020 |  | 2019
| (Dollars in millions)
Operating lease cost: |  |  |
Operating leases | $ | 28.8 |  |  | $ | 43.3 |
Short-term leases | 39.1 |  |  | 49.7 |
Variable leases | 4.6 |  |  | 19.1 |
Sublease income | (2.3) |  |  | (2.6) |
Total operating lease cost | $ | 70.2 |  |  | $ | 109.5 |
Finance lease cost: |  |  |
Amortization of right-of-use assets | $ | 3.5 |  |  | $ | 15.3 |
Interest on lease liabilities | 0.8 |  |  | 1.5 |
Total finance lease cost | $ | 4.3 |  |  | $ | 16.8 |
Schedule of Supplemental Balance Sheet Information Related to Leases | Supplemental balance sheet information related to leases at December 31, 2020 and 2019 was as follows:
| December 31,
| 2020 |  | 2019
| (Dollars in millions)
Operating leases: |  |  |
Operating lease right-of-use assets | $ | 49.9 |  |  | $ | 82.4 |
Accounts payable and accrued expenses | $ | 24.5 |  |  | $ | 29.6 |
Operating lease liabilities, less current portion | 42.1 |  |  | 52.8 |
Total operating lease liabilities | $ | 66.6 |  |  | $ | 82.4 |
Finance leases: |  |  |
Property, plant, equipment and mine development | $ | 20.4 |  |  | $ | 89.6 |
Accumulated depreciation | (2.5) |  |  | (45.9) |
Property, plant, equipment and mine development, net | $ | 17.9 |  |  | $ | 43.7 |
Current portion of long-term debt | $ | 21.5 |  |  | $ | 14.3 |
Long-term debt, less current portion | 5.8 |  |  | 0.9 |
Total finance lease liabilities | $ | 27.3 |  |  | $ | 15.2 |
Weighted average remaining lease term (years) |  |  |
Operating leases | 3.4 |  | 3.8
Finance leases | 9.0 |  | 0.6
Weighted average discount rate |  |  |
Operating leases | 6.8 | % |  | 7.3 | %
Finance leases | 11.2 | % |  | 6.0 | %
Schedule of Supplemental Cash Flow Information Related to Leases | Supplemental cash flow information related to leases during the years ended December 31, 2020 and 2019 was as follows:
| Year Ended December 31,
| 2020 |  | 2019
| (Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows for operating leases | $ | 35.1 |  |  | $ | 51.0 |
Operating cash flows for finance leases | 0.8 |  |  | 1.5 |
Financing cash flows for finance leases | 8.9 |  |  | 29.6 |
Right-of-use assets obtained in exchange for lease obligations: |  |  |
Operating leases | 16.5 |  |  | 16.6 |
Finance leases | 1.6 |  |  | 1.6 |
Lessee, Operating Lease, Liability, Maturity | The Company's leases have remaining lease terms ranging from 1 year to 21.0 years, some of which include options to extend the terms deemed reasonably certain of exercise. The contractual maturities of lease liabilities were as follows:
Period Ending December 31, |  | Operating Leases |  | Finance Leases
|  | (Dollars in millions)
2021 |  | $ | 24.8 |  |  | $ | 17.1 |
2022 |  | 17.6 |  |  | 5.8 |
2023 |  | 16.8 |  |  | 1.5 |
2024 |  | 6.0 |  |  | 0.7 |
2025 |  | 3.4 |  |  | 0.5 |
2026 and thereafter |  | 3.8 |  |  | 7.7 |
Total lease payments |  | 72.4 |  |  | 33.3 |
Less imputed interest |  | (5.8) |  |  | (6.0) |
Total lease liabilities |  | $ | 66.6 |  |  | $ | 27.3 |
Finance Lease, Liability, Maturity | The Company's leases have remaining lease terms ranging from 1 year to 21.0 years, some of which include options to extend the terms deemed reasonably certain of exercise. The contractual maturities of lease liabilities were as follows:
Period Ending December 31, |  | Operating Leases |  | Finance Leases
|  | (Dollars in millions)
2021 |  | $ | 24.8 |  |  | $ | 17.1 |
2022 |  | 17.6 |  |  | 5.8 |
2023 |  | 16.8 |  |  | 1.5 |
2024 |  | 6.0 |  |  | 0.7 |
2025 |  | 3.4 |  |  | 0.5 |
2026 and thereafter |  | 3.8 |  |  | 7.7 |
Total lease payments |  | 72.4 |  |  | 33.3 |
Less imputed interest |  | (5.8) |  |  | (6.0) |
Total lease liabilities |  | $ | 66.6 |  |  | $ | 27.3 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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