SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Oct. 25, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Subsequent Event [Line Items]
Cash Available for Distribution		$ 160.9		$ 160.9
Cash distributions paid per limited partner unit outstanding (in dollars per share)		$ 0.35
Amount of distribution		$ 147.7	$ 204.1	441.0	$ 608.7
Subsequent Event [Member]
Subsequent Event [Line Items]
Distribution declaration date	Oct. 25, 2017
Distribution payment date	Nov. 14, 2017
Distribution record date	Nov. 07, 2017
Total amount of distribution paid	$ 129.7
Percentage of Distribution Retained	2.00%
Subsequent Event [Member] | I Units [Member]
Subsequent Event [Line Items]
Amount of distribution	$ 30.6
Amount paid to parent	$ 0.6
Series EA Interests [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Distribution declaration date	Oct. 25, 2017
Amount paid to parent	$ 51.4
Amount paid to the noncontrolling interest	$ 34.3
Series ME Interests [Member]
Subsequent Event [Line Items]
Total amount of distribution paid				162.7
Amount paid to parent				40.7
Amount paid to the noncontrolling interest				$ 122.0
Series ME Interests [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Distribution declaration date	Oct. 25, 2017
Amount paid to parent	$ 44.2
Amount paid to the noncontrolling interest	$ 14.7