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Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease expense during the three and six months ended June 30, 2019 were as follows:
| Three Months Ended June 30, 2019 |  | Six Months Ended June 30, 2019
| (Dollars in millions)
Operating lease cost: |  |  |
Operating lease cost | $ | 11.8 |  |  | $ | 27.2 |
Short-term lease cost | 7.4 |  |  | 15.7 |
Variable lease cost | 8.5 |  |  | 14.5 |
Sublease income | (0.4 | ) |  | (0.8 | )
Total operating lease cost | $ | 27.3 |  |  | $ | 56.6 |
Finance lease cost: |  |  |
Amortization of right-of-use assets | $ | 1.9 |  |  | $ | 8.6 |
Interest on lease liabilities | 0.4 |  |  | 0.9 |
Total finance lease cost | $ | 2.3 |  |  | $ | 9.5 |
Schedule of Supplemental Balance Sheet Information Related to Leases [Table Text Block] | Supplemental balance sheet information related to leases at June 30, 2019 was as follows:
| June 30, 2019
| (Dollars in millions)
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 | )
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, less current portion | — |
Total finance lease liabilities | $ | 24.5 |
Weighted average remaining lease term (years) |
Operating leases | 4.1 |
Finance leases | 0.7 |
Weighted average discount rate |
Operating leases | 7.4 | %
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 six months ended June 30, 2019 was as follows:
| Three Months Ended June 30, 2019 |  | Six Months Ended June 30, 2019
| (Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows for operating leases | $ | 9.3 |  |  | $ | 33.3 |
Operating cash flows for finance leases | 0.4 |  |  | 1.2 |
Financing cash flows for finance leases | 8.2 |  |  | 18.4 |
Right-of-use assets obtained in exchange for lease obligations: |  |  |
Operating leases | $ | 27.3 |  |  | $ | 27.8 |
Finance leases | 1.4 |  |  | 1.4 |
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 |  | $ | 16.8 |  |  | $ | 17.4 |
2020 |  | 30.0 |  |  | 7.6 |
2021 |  | 18.4 |  |  | — |
2022 |  | 13.3 |  |  | — |
2023 |  | 12.2 |  |  | — |
2024 and thereafter |  | 12.1 |  |  | — |
Total lease payments |  | 102.8 |  |  | 25.0 |
Less imputed interest |  | (15.4 | ) |  | (0.5 | )
Total lease liabilities |  | $ | 87.4 |  |  | $ | 24.5 |

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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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