INVENTORY (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
INVENTORY [Abstract]
Materials and supplies	$ 2.2		$ 2.2		$ 2.2
Crude oil inventory	5.7		5.7		13.2
Natural gas and NGL inventory	82.3		82.3		78.8
Inventory, Net, Total	90.2		90.2		$ 94.2
Charges related to cost of natural gas	$ 0.7	$ 1.5	$ 5.3	$ 3.3