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Leases (Tables) | 3 Months Ended
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Mar. 31, 2020
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease expense during the three months ended March 31, 2020 and 2019 were as follows:
| Three Months Ended March 31,
| 2020 |  | 2019
| (Dollars in millions)
Operating lease cost: |  |  |
Operating lease cost | $ | 8.6 |  |  | $ | 15.5 |
Short-term lease cost | 9.9 |  |  | 8.3 |
Variable lease cost | 1.0 |  |  | 6.0 |
Sublease income | — |  |  | (1.4 | )
Total operating lease cost | $ | 19.5 |  |  | $ | 28.4 |
Finance lease cost: |  |  |
Amortization of right-of-use assets | $ | 3.4 |  |  | $ | 4.1 |
Interest on lease liabilities | 0.2 |  |  | 0.5 |
Total finance lease cost | $ | 3.6 |  |  | $ | 4.6 |
Schedule of Supplemental Balance Sheet Information Related to Leases [Table Text Block] | Supplemental balance sheet information related to leases at March 31, 2020 and December 31, 2019 was as follows:
| March 31, 2020 |  | December 31, 2019
| (Dollars in millions)
Operating leases: |  |  |
Operating lease right-of-use assets | $ | 78.0 |  |  | $ | 82.4 |
Accounts payable and accrued expenses | $ | 25.2 |  |  | $ | 29.6 |
Operating lease liabilities, less current portion | 44.5 |  |  | 52.8 |
Total operating lease liabilities | $ | 69.7 |  |  | $ | 82.4 |
Finance leases: |  |  |
Property, plant, equipment and mine development | $ | 88.0 |  |  | $ | 89.6 |
Accumulated depreciation | (47.6 | ) |  | (45.9 | )
Property, plant, equipment and mine development, net | $ | 40.4 |  |  | $ | 43.7 |
Current portion of long-term debt | $ | 8.6 |  |  | $ | 14.3 |
Long-term debt, less current portion | 0.5 |  |  | 0.9 |
Total finance lease liabilities | $ | 9.1 |  |  | $ | 15.2 |
Weighted average remaining lease term (years) |  |  |
Operating leases | 3.7 |  |  |
Finance leases | 14.8 |  |  |
Weighted average discount rate |  |  |
Operating leases | 7.3 | % |  |
Finance leases | 6.0 | % |  |
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, 2020 and 2019 was as follows:
| Three Months Ended March 31,
| 2020 |  | 2019
| (Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows for operating leases | $ | 12.8 |  |  | $ | 24.1 |
Operating cash flows for finance leases | 0.2 |  |  | 0.7 |
Financing cash flows for finance leases | 5.8 |  |  | 7.3 |
Right-of-use assets obtained in exchange for lease obligations: |  |  |
Operating leases | 1.3 |  |  | 0.5 |
Finance leases | 0.1 |  |  | — |
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)
2020 |  | $ | 21.8 |  |  | $ | 0.7 |
2021 |  | 22.6 |  |  | 1.0 |
2022 |  | 13.5 |  |  | 0.7 |
2023 |  | 11.6 |  |  | 0.5 |
2024 |  | 4.7 |  |  | 0.5 |
2025 and thereafter |  | 7.3 |  |  | 8.2 |
Total lease payments |  | 81.5 |  |  | 11.6 |
Less imputed interest |  | (11.8 | ) |  | (2.5 | )
Total lease liabilities |  | $ | 69.7 |  |  | $ | 9.1 |

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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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