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
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Partnership distribution payable $ 44.2 $ 44.2 $ 44.2
Related Party Transaction, Due from (to) Related Party 162.1   8.1
Trade Accounts Receivable [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Current 83.2   68.1
Derivative [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Current 169.4   37.9
Due to Related Parties, Current (42.7)   (41.4)
Other Current Liabilities [Member]      
Related Party Transaction [Line Items]      
Due to Related Parties, Current $ (3.6)   $ (12.3)