Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES - Purchase Commitments (Details)

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COMMITMENTS AND CONTINGENCIES - Purchase Commitments (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
Estimated Project Capital Expenditures $ 1,000.0
Total Project Expenditures, Excluding Capitalized Interest 894.3
Capital Addition Purchase Commitments [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Capital Additions, Purchase Commitments $ 92.2