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Leases (Tables) | 9 Months Ended
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Sep. 30, 2019
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease expense during the three and nine months ended September 30, 2019 were as follows:
| Three Months Ended September 30, 2019 |  | Nine Months Ended September 30, 2019
| (Dollars in millions)
Operating lease cost: |  |  |
Operating lease cost | $ | 9.9 |  |  | $ | 33.9 |
Short-term lease cost | 15.8 |  |  | 34.7 |
Variable lease cost | 2.0 |  |  | 16.6 |
Sublease income | (1.0 | ) |  | (1.9 | )
Total operating lease cost | $ | 26.7 |  |  | $ | 83.3 |
Finance lease cost: |  |  |
Amortization of right-of-use assets | $ | 3.4 |  |  | $ | 12.0 |
Interest on lease liabilities | 0.3 |  |  | 1.2 |
Total finance lease cost | $ | 3.7 |  |  | $ | 13.2 |
Schedule of Supplemental Balance Sheet Information Related to Leases [Table Text Block] | Supplemental balance sheet information related to leases at September 30, 2019 was as follows:
| September 30, 2019
| (Dollars in millions)
Operating leases: |
Operating lease right-of-use assets | $ | 85.6 |
Accounts payable and accrued expenses | $ | 27.6 |
Operating lease liabilities, less current portion | 55.1 |
Total operating lease liabilities | $ | 82.7 |
Finance leases: |
Property, plant, equipment and mine development | $ | 95.4 |
Accumulated depreciation | (49.3 | )
Property, plant, equipment and mine development, net | $ | 46.1 |
Current portion of long-term debt | $ | 19.4 |
Long-term debt, less current portion | 0.2 |
Total finance lease liabilities | $ | 19.6 |
Weighted average remaining lease term (years) |
Operating leases | 4.0 |
Finance leases | 0.6 |
Weighted average discount rate |
Operating leases | 7.3 | %
Finance leases | 5.9 | %
Schedule of Supplemental Cash Flow Information Related to Leases [Table Text Block] | Supplemental cash flow information related to leases during the three and nine months ended September 30, 2019 was as follows:
| Three Months Ended September 30, 2019 |  | Nine Months Ended September 30, 2019
| (Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows for operating leases | $ | 8.4 |  |  | $ | 41.8 |
Operating cash flows for finance leases | 0.3 |  |  | 1.2 |
Financing cash flows for finance leases | 5.6 |  |  | 24.0 |
Right-of-use assets obtained in exchange for lease obligations: |  |  |
Operating leases | 3.4 |  |  | 9.7 |
Finance leases | 0.3 |  |  | 0.4 |
Schedule of Maturities of Operating and Finance Lease Liabilities [Table Text Block] | Maturities of lease liabilities were as follows:
Period Ending December 31, |  | Operating Leases |  | Finance Leases
|  | (Dollars in millions)
2019 |  | $ | 8.8 |  |  | $ | 5.9 |
2020 |  | 30.9 |  |  | 13.9 |
2021 |  | 19.7 |  |  | 0.1 |
2022 |  | 13.0 |  |  | 0.1 |
2023 |  | 12.1 |  |  | 0.1 |
2024 and thereafter |  | 12.1 |  |  | — |
Total lease payments |  | 96.6 |  |  | 20.1 |
Less imputed interest |  | (13.9 | ) |  | (0.5 | )
Total lease liabilities |  | $ | 82.7 |  |  | $ | 19.6 |

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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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