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Leases (Tables) | 3 Months Ended
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Mar. 31, 2019
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease expense during the three months ended March 31, 2019 were as follows:
| Three Months Ended March 31, 2019
| (Dollars in millions)
Operating lease cost: |
Operating lease cost | $ | 15.5 |
Short-term lease cost | 8.3 |
Variable lease cost | 6.0 |
Sublease income | (1.4 | )
Total operating lease cost | $ | 28.4 |
Finance lease cost: |
Amortization of right-of-use assets | $ | 4.1 |
Interest on lease liabilities | 0.5 |
Total finance lease cost | $ | 4.6 |
Schedule of Supplemental Balance Sheet Information Related to Leases [Table Text Block] | Supplemental balance sheet information related to leases at March 31, 2019 was as follows:
| March 31, 2019
| (Dollars in millions)
Operating leases: |
Operating lease right-of-use assets | $ | 97.0 |
Accounts payable and accrued expenses | $ | 30.7 |
Operating lease liabilities, less current portion | 58.2 |
Total operating lease liabilities | $ | 88.9 |
Finance leases: |
Property, plant, equipment and mine development | $ | 97.8 |
Accumulated depreciation | (33.4 | )
Property, plant, equipment and mine development, net | $ | 64.4 |
Current portion of long-term debt | $ | 30.8 |
Long-term debt, less current portion | 1.9 |
Total finance lease liabilities | $ | 32.7 |
Weighted average remaining lease term |
Operating leases | 4.2 years |
Finance leases | 5.4 years |
Weighted average discount rate |
Operating leases | 7.4 | %
Finance leases | 7.6 | %
Schedule of Supplemental Cash Flow Information Related to Leases [Table Text Block] | Supplemental cash flow information related to leases during the three months ended March 31, 2019 was as follows:
| Three Months Ended March 31, 2019
| (Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities: |
Operating cash flows for operating leases | $ | 24.1 |
Operating cash flows for finance leases | 0.7 |
Financing cash flows for finance leases | 7.3 |
Right-of-use assets obtained in exchange for lease obligations: |
Operating leases | $ | 0.5 |
Finance leases | — |
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 |  | $ | 27.0 |  |  | $ | 28.7 |
2020 |  | 28.0 |  |  | 8.1 |
2021 |  | 16.5 |  |  | 0.5 |
2022 |  | 11.9 |  |  | 0.5 |
2023 |  | 12.2 |  |  | 0.5 |
2024 and thereafter |  | 12.1 |  |  | 8.7 |
Total lease payments |  | 107.7 |  |  | 47.0 |
Less imputed interest |  | (18.8 | ) |  | (14.3 | )
Total lease liabilities |  | $ | 88.9 |  |  | $ | 32.7 |

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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/2003/role/presentationRef -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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