CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents (Note 4)	$ 110.5	$ 197.9
Restricted cash (Notes 3, 10 and 12)	46.2	97.0
Receivables, trade and other, net of allowance for doubtful accounts of $1.6 million and $1.8 million at September 30, 2015 and December 31, 2014, respectively	9.8	46.2
Due from General Partner and affiliates	69.9	41.4
Accrued receivables	44.1	260.3
Inventory (Note 5)	88.3	94.2
Other current assets (Note 12)	193.8	218.4
Assets, Current, Total	562.6	955.4
Property, plant and equipment, net (Notes 6 and 16)	$ 17,006.4	15,692.7
Goodwill (Note 7)		246.7
Intangible assets, net	$ 284.3	254.8
Other assets, net (Note 12)	553.6	597.3
Total assets	18,406.9	17,746.9
Current liabilities:
Due to General Partner and affiliates (Note 10)	225.4	143.7
Accounts payable and other (Notes 4, 12 and 16)	903.5	777.7
Environmental liabilities (Note 11)	101.6	141.7
Accrued purchases	200.6	375.7
Interest payable	74.7	74.6
Property and other taxes payable (Note 13)	$ 99.2	96.5
Note payable to General Partner (Note 10)		306.0
Liabilities, Current, Total	$ 1,605.0	1,915.9
Long-term debt (Note 8)	7,169.8	6,675.2
Due to General Partner and affiliates (Note 10)	215.8	148.3
Other long-term liabilities (Notes 6, 11, 12 and 13)	357.0	278.1
Total Liabilities	$ 9,347.6	$ 9,017.5
Commitments and contingencies (Note 11)
Partners' capital: (Notes 9 and 10)
Series 1 preferred units (48,000,000 authorized and issued at September 30, 2015 and December 31, 2014)	$ 1,185.7	$ 1,175.6
General Partner	169.5	198.3
Accumulated other comprehensive loss (Note 12)	(388.7)	(211.4)
Total Enbridge Energy Partners, L.P. partners' capital	5,156.9	5,120.4
Noncontrolling interest (Note 10)	3,902.4	3,609.0
Total partners' capital	9,059.3	8,729.4
Liabilities and Stockholders' Equity, Total	18,406.9	17,746.9
Class D Units [Member]
Partners' capital: (Notes 9 and 10)
Common units	2,517.6	$ 2,516.8
Class E Units [Member]
Partners' capital: (Notes 9 and 10)
Common units	$ 778.3
Class A Common Units [Member]
Partners' capital: (Notes 9 and 10)
Common units		$ 235.5
Class B Common Units [Member]
Partners' capital: (Notes 9 and 10)
Common units
i-Units [Member]
Partners' capital: (Notes 9 and 10)
Common units	$ 399.6	$ 712.6
Incentive Distribution Units [Member]
Partners' capital: (Notes 9 and 10)
Common units	$ 494.9	$ 493.0