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Leases (Tables)
 6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of lease expense during the three and six months ended June 30, 2020 and 2019 were as follows:
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
(Dollars in millions)
Operating lease cost:
Operating lease cost$8.4  $11.8  $17.0  $27.2  
Short-term lease cost11.6  7.4  21.5  15.7  
Variable lease cost1.6  8.5  2.6  14.5  
Sublease income—  (0.4) —  (0.8) 
Total operating lease cost$21.6  $27.3  $41.1  $56.6  
Finance lease cost:
Amortization of right-of-use assets$1.0  $1.9  $4.4  $8.6  
Interest on lease liabilities0.1  0.4  0.3  0.9  
Total finance lease cost$1.1  $2.3  $4.7  $9.5  
Schedule of Supplemental Balance Sheet Information Related to Leases [Table Text Block]
Supplemental balance sheet information related to leases at June 30, 2020 and December 31, 2019 was as follows:
June 30, 2020December 31, 2019
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets$50.7  $82.4  
Accounts payable and accrued expenses$24.9  $29.6  
Operating lease liabilities, less current portion42.0  52.8  
Total operating lease liabilities$66.9  $82.4  
Finance leases:
Property, plant, equipment and mine development$44.2  $89.6  
Accumulated depreciation(27.6) (45.9) 
Property, plant, equipment and mine development, net$16.6  $43.7  
Current portion of long-term debt$6.9  $14.3  
Long-term debt, less current portion1.0  0.9  
Total finance lease liabilities$7.9  $15.2  
Weighted average remaining lease term (years)
Operating leases3.6
Finance leases17.3
Weighted average discount rate
Operating leases7.4 %
Finance leases6.2 %
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, 2020 and 2019 was as follows:
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases$6.8  $9.3  $19.6  $33.3  
Operating cash flows for finance leases0.1  0.4  0.3  1.2  
Financing cash flows for finance leases2.1  8.2  7.9  18.4  
Right-of-use assets obtained in exchange for lease obligations:
Operating leases0.8  5.8  2.1  6.3  
Finance leases0.8  0.1  0.9  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 LeasesFinance Leases
 (Dollars in millions)
2020$15.9  $0.6  
202123.6  1.2  
202214.0  0.9  
202311.9  0.7  
20244.8  0.6  
2025 and thereafter7.2  8.2  
Total lease payments77.4  12.2  
Less imputed interest(10.5) (4.3) 
Total lease liabilities$66.9  $7.9