PARTNERS' CAPITAL (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 27, 2017	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Unamortized Beneficial Conversion Feature Discount	$ 8.5
Increase In General Partners' Capital Account	$ 2,700.0
Incentive Distributions Description		The Class F units are entitled to (i) 13% of all distributions of available cash in excess of $0.295 per unit, but less than or equal to $0.35 per unit, and (ii) 23% of all distributions of available cash in excess of $0.35 per unit.
General Partner [Member]
Allocations from capital accounts			$ 11.9
Incentive Distribution Units [Member]
Number of units waived (in shares)	1,000	1,000	1,000
Class D Units [Member]
Number of units waived (in shares)	66,100,000	66,100,000	66,100,000
I Units [Member]
Allocations from capital accounts			$ 39.9
Limited Partners' Capital Account, Units Issued		85,620,914	85,620,914	81,857,168
Series 1 Preferred units [Member]
Stock Redeemed or Called During Period, Value	$ 1,200.0
General Partner Distributions	$ 357.3
Common Class F [Member]
Limited Partners' Capital Account, Units Issued	1,000	1,000	1,000
Limited Partners' Contributed Capital	$ 263.0
Common Class A [Member]
Stock Issued During Period, Value, New Issues	$ 1,200.0
Shares Issued, Price Per Share	$ 18.66
Fair value Per Share	$ 18.57
Common Class A [Member] | General Partner [Member]
Stock Issued During Period, Shares, New Issues	64,308,682	64,308,682	64,308,682