CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 196.0	$ (574.6)	$ 550.5	$ (224.5)
Other comprehensive income (loss), net of tax
Change in unrealized (gain) loss on cash flow hedges	(4.2)	4.8	(24.5)	(134.3)
Reclassification to earnings of loss on cash flow hedges	9.8	9.9	30.5	29.7
Other comprehensive income (loss), net of tax	5.6	14.7	6.0	(104.6)
Comprehensive income (loss)	201.6	(559.9)	556.5	(329.1)
Less:
Comprehensive income (loss) attributable to noncontrolling interests	102.9	(191.9)	261.8	(52.8)
Series 1 preferred unit distributions	0.0	22.5	29.0	67.5
Net income attributable to accretion of discount on Series 1 preferred units	0.0	1.2	8.5	3.5
Comprehensive income (loss) attributable to general and limited partner ownership interests in Enbridge Energy Partners, L.P.	$ 98.7	$ (391.7)	$ 257.2	$ (347.3)