Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Details)

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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Estimated Project Capital Expenditures $ 830.0  
Project Spend Contingency Percentage 20.00%  
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months $ 290.0  
Accrual for Environmental Loss Contingencies 2.0 $ 2.5
Capital Addition Purchase Commitments [Member]    
Loss Contingencies [Line Items]    
Unrecorded Unconditional Purchase Obligation $ 260.0