PROPERTY, PLANT AND EQUIPMENT (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 20,923.3	$ 20,648.2
Accumulated depreciation	(3,350.7)	(3,235.8)
Property, plant and equipment, net	17,572.6	17,412.4
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	67.2	62.9
Rights-of-Way [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	958.8	952.5
Pipelines [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	10,415.9	10,376.3
Pumping Equipment, Buildings and Tanks [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,474.2	4,232.3
Compressors, Meters and Other Operating Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,160.2	2,147.6
Vehicles, Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	284.4	280.0
Processing and Treating Plants [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	629.2	627.8
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,933.4	$ 1,968.8