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EXPENSES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Expenses by nature [abstract]    
Raw materials and consumables $ 148.1 $ 85.0
Salaries and employee benefits 102.1 59.6
Contractors 60.6 32.2
Repairs and maintenance 47.7 15.1
General and administrative 20.3 15.7
Operating leases 4.2 2.3
Royalties 3.5 2.9
Drilling and analytical 2.4 1.3
Other 5.2 2.5
Total production expenses 394.1 216.6
Less: Production expenses capitalized (45.3) (22.5)
Less: Change in inventories (23.4) 4.2
Total operating expenses $ 325.4 $ 198.3