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NONCONTROLLING INTERESTS (Tables)
 6 Months Ended
Jun. 30, 2017
Noncontrolling Interest [Abstract]  
Schedule of Non Controlling Interest

 
 
 
Three months
ended June 30,
 
Six months
ended June 30,
  
 
2017
 
2016
 
2017
 
2016
  
 
(in millions)
Eastern Access Interests
 
$
36.8
 
 
$
53.2
 
 
$
76.3
 
 
$
104.7
 
U.S. Mainline Expansion Interests
 
 
35.8
 
 
 
34.1
 
 
 
69.2
 
 
 
60.7
 
North Dakota Pipeline Company Interests
 
 
18.4
 
 
 
—
 
 
 
16.8
 
 
 
—
 
Line 3 Replacement Interests
 
 
6.0
 
 
 
—
 
 
 
10.6
 
 
 
—
 
Enbridge Holdings (DakTex) L.L.C. Interests
 
 
4.8
 
 
 
—
 
 
 
4.8
 
 
 
—
 
Midcoast Energy Partners, L.P. – Discontinued Operations
 
 
(11.2
) 
 
 
(17.0
) 
 
 
(18.8
) 
 
 
(26.3
) 
Total
 
$
90.6
 
 
$
70.3
 
 
$
158.9
 
 
$
139.1