Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
RELATED PARTIES (Summary of Balance Sheet Presentation) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Partnership distribution payable $ 44.1 $ 43.5
Related Party Transaction, Due from (to) Related Party 208.7 220.0
Trade Accounts Receivable [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current 139.3 176.0
Derivative [Member]    
Related Party Transaction [Line Items]    
Due from Related Parties, Current 116.2 89.3
Other Current Liabilities [Member]    
Related Party Transaction [Line Items]    
Due to Related Parties, Current $ (2.7) $ (1.8)