INVENTORY (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
INVENTORY [Abstract]
Materials and supplies	$ 2.2		$ 2.2		$ 2.2
Crude oil inventory	0.8		0.8		13.2
Natural gas and NGL inventory	85.3		85.3		78.8
Inventory, Net, Total	88.3		88.3		$ 94.2
Charges related to cost of natural gas	$ 0.1	$ 1.5	$ 5.4	$ 4.8