Quarterly report pursuant to Section 13 or 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
Mar. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Partnership distribution payable $ 43.8 $ 43.5
Related Party Transaction, Due from (to) Related Party 77.4 220.0
Trade Accounts Receivable [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current 15.3 176.0
Derivative [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current 106.4 89.3
Other Current Liabilities [Member]    
Related Party Transaction [Line Items]    
Due to Related Parties, Current $ (0.5) $ (1.8)