PROPERTY, PLANT AND EQUIPMENT (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 20,381.0	$ 20,648.2
Accumulated depreciation	(3,658.4)	(3,235.8)
Property, plant and equipment, net	16,722.6	17,412.4
Land [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	103.2	62.9
Rights-of-Way [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 932.2	952.5
Rights-of-Way [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	1.80%
Rights-of-Way [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	13.00%
Pipelines [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 10,448.6	10,376.3
Pipelines [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	1.79%
Pipelines [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	13.00%
Pumping Equipment, Buildings and Tanks [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 4,953.8	4,232.3
Pumping Equipment, Buildings and Tanks [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	1.48%
Pumping Equipment, Buildings and Tanks [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	13.00%
Compressors, Meters and Other Operating Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 2,182.6	2,147.6
Compressors, Meters and Other Operating Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	1.80%
Compressors, Meters and Other Operating Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	20.00%
Vehicles, Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 233.8	280.0
Vehicles, Office Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	1.33%
Vehicles, Office Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	33.33%
Processing and Treating Plants [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 630.0	627.8
Processing and Treating Plants [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	2.21%
Processing and Treating Plants [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	4.00%
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 896.8	$ 1,968.8