Annual report pursuant to Section 13 and 15(d)

RELATED PARTIES (Summary of Balance Sheet Presentation) (Details)

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RELATED PARTIES (Summary of Balance Sheet Presentation) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Related Party Transaction, Due from (to) Related Party $ 73.6 $ 220.0
Trade Accounts Receivable [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current 31.1 176.0
Derivative Asset [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current 44.5 89.3
Other Current Liabilities [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current $ 2.0 $ 45.3