Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
RELATED PARTIES (Summary of Balance Sheet Presentation) (Details) - USD ($)
$ in Millions
Mar. 31, 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 11.4   8.1
Trade Accounts Receivable [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Current 7.9   68.1
Derivative [Member]      
Related Party Transaction [Line Items]      
Due from Related Parties, Current 91.3   37.9
Due to Related Parties, Current (42.0)   (41.4)
Accounts Payable [Member]      
Related Party Transaction [Line Items]      
Due to Related Parties, Current (1.2)   0.0
Other Current Liabilities [Member]      
Related Party Transaction [Line Items]      
Due to Related Parties, Current $ (0.4)   $ (12.3)