RELATED PARTY TRANSACTIONS (Tables)

9 Months Ended

Sep. 30, 2015

RELATED PARTY TRANSACTIONS [Abstract]

Schedule of Distributions

Distribution	Distribution	Amount Paid to		Amount Paid to the		Total MEP
Declaration Date	Payment Date	EEP		noncontrolling interest		Distribution
		(in millions)
July 29, 2015	August 14, 2015	$	8.8	$	7.5	$	16.3
April 29, 2015	May 15, 2015		8.6		7.4		16.0
January 28, 2015	February 13, 2015		8.5		7.3		15.8
		$	25.9	$	22.2	$	48.1

Distribution	Distribution	Amount Paid to		Amount paid to the		Total Series AC
Declaration Date	Payment Date	Partnership		noncontrolling interest		Distribution
		(in millions)
January 29, 2015	February 13, 2015	$	13.7	$	27.5	$	41.2

Distribution	Distribution	Amount Paid to		Amount Paid to the		Total Series EA
Declaration Date	Payment Date	EEP		noncontrolling interest		Distribution
		(in millions)
July 30, 2015	August 14, 2015	$	56.5	$	—	$	56.5
April 30, 2015	May 15, 2015		17.5		52.3		69.8
January 29, 2015	February 13, 2015		22.3		67.0		89.3
		$	96.3	$	119.3	$	215.6

Distribution	Distribution	Amount Paid to		Amount Paid to the		Total Series ME
Declaration Date	Payment Date	EEP		noncontrolling interest		Distribution
		(in millions)
July 30, 2015	August 14, 2015	$	14.8	$	—	$	14.8
April 30, 2015	May 15, 2015		1.5		4.5		6.0
January 29, 2015	February 13, 2015		1.8		5.2		7.0
		$	18.1	$	9.7	$	27.8

Schedule of Components of Noncontrolling Interests

	For the three months					For the nine months
	ended September 30,					ended September 30,
	2015			2014		2015			2014
	(in millions)					(in millions)
Alberta Clipper Interests	$	—		$	16.3	$	(0.8	)	$	38.0
Eastern Access Interests		50.3			41.7		140.2			90.5
U.S. Mainline Expansion Interests		29.1			9.8		73.5			20.0
Midcoast Energy Partners, L.P.		(1.6	)		2.9		(73.8	)		0.9
Total	$	77.8		$	70.7	$	139.1		$	149.4