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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Revenues - related parties: |  |  |  |  |
Total revenue - related parties | $ 13.2 | $ 7.3 | $ 28.8 | $ 13.4 |
Costs and expenses - related parties: |  |  |  |  |
Total costs and expenses - related parties | 298.8 | 295.2 | 609.0 | 556.3 |
Accounts receivable - related parties: |  |  |  |  |
Total accounts receivable - related parties | 2.1 |  | 2.1 |  | $ 1.2
Accounts payable - related parties: |  |  |  |  |
Total accounts payable - related parties | 78.8 |  | 78.8 |  | $ 84.1
Related Party Transactions [Abstract] |  |  |  |  |
Operating costs and expenses | 270.3 | 267.1 | 550.9 | 499.2 |
General and administrative expenses | 28.5 | 28.1 | 58.1 | 57.1 |
Relationship with Affiliates [Abstract] |  |  |  |  |
Net cash proceeds from the issuance of common units |  |  | $ 1,888.3 | $ 944.1 |
Number of Designated Units excluded from distributions (in units) |  |  |  |  | 35,380,000
At-the-Market Registration [Member] |  |  |  |  |
Relationship with Affiliates [Abstract] |  |  |  |  |
Number of common units issued (in units) |  |  | 68,645,180 | 23,258,453 |
Gross proceeds from the sale of common units |  |  | $ 1,660.0 | $ 767.1 |
Net cash proceeds from the issuance of common units |  |  | $ 1,650.0 | $ 760.0 |
Distribution Reinvestment Plan [Member] |  |  |  |  |
Relationship with Affiliates [Abstract] |  |  |  |  |
Number of common units issued (in units) |  |  | 10,104,741 | 5,453,541 |
Net cash proceeds from the issuance of common units |  |  | $ 232.3 | $ 177.8 |
EPCO and its privately held affiliates [Member] |  |  |  |  |
Costs and expenses - related parties: |  |  |  |  |
Total costs and expenses - related parties | 241.4 | 236.0 | 478.7 | 457.9 |
Accounts payable - related parties: |  |  |  |  |
Total accounts payable - related parties | $ 67.1 |  | 67.1 |  | $ 75.6
Distributions: |  |  |  |  |
Total cash distributions |  |  | $ 525.2 | $ 466.7 |
Relationship with Affiliates [Abstract] |  |  |  |  |
Total Number of Units (in units) | 685,481,428 |  | 685,481,428 |  |
Percentage of Total Units Outstanding (in hundredths) | 32.80% |  | 32.80% |  |
Number of Designated Units excluded from distributions (in units) |  |  |  |  | 35,380,000
Enterprise common units pledged as security (in units) | 118,000,000 |  | 118,000,000 |  |
EPCO and its privately held affiliates [Member] | At-the-Market Registration [Member] |  |  |  |  |
Relationship with Affiliates [Abstract] |  |  |  |  |
Number of common units issued (in units) |  |  | 3,830,256 | 3,225,057 |
Gross proceeds from the sale of common units |  |  | $ 100.0 | $ 100.0 |
EPCO and its privately held affiliates [Member] | Distribution Reinvestment Plan [Member] |  |  |  |  |
Relationship with Affiliates [Abstract] |  |  |  |  |
Number of common units issued (in units) |  |  | 4,481,504 |  |
Net cash proceeds from the issuance of common units |  |  | $ 100.0 |  |
EPCO and its privately held affiliates [Member] | Administrative Services Agreement [Member] |  |  |  |  |
Costs and expenses - related parties: |  |  |  |  |
Total costs and expenses - related parties | $ 236.9 | 231.7 | 469.6 | 449.3 |
Related Party Transactions [Abstract] |  |  |  |  |
Operating costs and expenses | 210.6 | 205.9 | 416.0 | 396.9 |
General and administrative expenses | 26.3 | 25.8 | 53.6 | 52.4 |
Unconsolidated affiliates [Member] |  |  |  |  |
Revenues - related parties: |  |  |  |  |
Total revenue - related parties | 13.2 | 7.3 | 28.8 | 13.4 |
Costs and expenses - related parties: |  |  |  |  |
Total costs and expenses - related parties | 57.4 | $ 59.2 | 130.3 | $ 98.4 |
Accounts receivable - related parties: |  |  |  |  |
Total accounts receivable - related parties | 2.1 |  | 2.1 |  | $ 1.2
Accounts payable - related parties: |  |  |  |  |
Total accounts payable - related parties | $ 11.7 |  | $ 11.7 |  | $ 8.5

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