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Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 26, 2016 | Jan. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015
Revenues - related parties: |  |  |  |  |  |
Total revenue - related parties |  |  | $ 72.3 | $ 71.5 | $ 65.9 |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | 1,194.6 | 1,122.9 | 1,052.2 |
Accounts receivable - related parties: |  |  |  |  |  |
Total accounts receivable - related parties |  |  | 1.2 | 2.8 |  |
Accounts payable - related parties: |  |  |  |  |  |
Total accounts payable - related parties |  |  | 84.1 | 118.9 |  |
Related Party Transactions [Abstract] |  |  |  |  |  |
Operating costs and expenses |  |  | 1,080.5 | 992.1 | 937.9 |
General and administrative expenses |  |  | 114.1 | 130.8 | 114.3 |
Relationship with Affiliates [Abstract] |  |  |  |  |  |
Net cash proceeds from the issuance of common units |  |  | $ 1,188.6 | $ 388.8 | $ 1,792.0 |
At-the-Market Registration [Member] |  |  |  |  |  |
Relationship with Affiliates [Abstract] |  |  |  |  |  |
Number of common units issued (in units) |  |  | 25,520,424 | 1,590,334 | 15,249,378 |
Net cash proceeds from the issuance of common units |  |  | $ 817.4 | $ 57.7 | $ 456.3 |
Distribution Reinvestment Plan [Member] |  |  |  |  |  |
Relationship with Affiliates [Abstract] |  |  |  |  |  |
Number of common units issued (in units) |  |  | 12,413,351 | 9,480,407 | 10,024,828 |
Net cash proceeds from the issuance of common units |  |  | $ 359.8 | $ 321.3 | $ 287.6 |
EPCO and affiliates [Member] |  |  |  |  |  |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | 949.3 | 939.9 | 892.2 |
Accounts payable - related parties: |  |  |  |  |  |
Total accounts payable - related parties |  |  | 75.6 | 98.1 |  |
Distributions: |  |  |  |  |  |
Total cash distributions |  |  | $ 948.3 | $ 877.0 | $ 811.4 |
Number of Designated Units excluded from distributions (in units) |  |  | 35,380,000 | 45,120,000 | 47,400,000 |
Relationship with Affiliates [Abstract] |  |  |  |  |  |
Number of Units (in units) |  |  | 677,159,667 |  |  |
Percentage of total units outstanding (in hundredths) |  |  | 33.60% |  |  |
Enterprise common units pledged as security (in units) |  |  | 118,000,000 |  |  |
EPCO and affiliates [Member] | At-the-Market Registration [Member] |  |  |  |  |  |
Relationship with Affiliates [Abstract] |  |  |  |  |  |
Number of common units issued (in units) |  | 3,830,256 | 3,225,057 |  |  |
Offering price of common unit (in dollars per unit) |  |  |  |  |  | $ 31.01
Net cash proceeds from the issuance of common units |  | $ 100.0 | $ 100.0 |  |  |
EPCO and 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 |  | 100.0 | $ 100.0 |  |
EPCO and affiliates [Member] | Administrative Services Agreement [Member] |  |  |  |  |  |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | 931.6 | 923.3 | $ 875.8 |
Related Party Transactions [Abstract] |  |  |  |  |  |
Operating costs and expenses |  |  | 826.4 | 801.6 | 770.6 |
General and administrative expenses |  |  | 105.2 | 121.7 | 105.2 |
Unconsolidated affiliates [Member] |  |  |  |  |  |
Revenues - related parties: |  |  |  |  |  |
Total revenue - related parties |  |  | 72.3 | 71.5 | 65.9 |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | 245.3 | 183.0 | 160.0 |
Accounts receivable - related parties: |  |  |  |  |  |
Total accounts receivable - related parties |  |  | 1.2 | 2.8 |  |
Accounts payable - related parties: |  |  |  |  |  |
Total accounts payable - related parties |  |  | 8.5 | 20.8 |  |
Unconsolidated affiliates [Member] | Seaway Crude Pipeline Company [Member] |  |  |  |  |  |
Revenues - related parties: |  |  |  |  |  |
Total revenue - related parties |  |  | 47.7 | 29.4 | 41.3 |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | 175.8 | 130.8 | 132.4 |
Unconsolidated affiliates [Member] | K/D/S Promix, L.L.C. [Member] |  |  |  |  |  |
Revenues - related parties: |  |  |  |  |  |
Total revenue - related parties |  |  | 8.8 | 11.1 | 9.8 |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | 24.9 | 25.8 | 28.1 |
Unconsolidated affiliates [Member] | Eagle Ford Pipeline LLC [Member] |  |  |  |  |  |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | 39.4 | 25.8 | 5.4 |
Unconsolidated affiliates [Member] | Other investments in unconsolidated subsidiaries [Member] |  |  |  |  |  |
Costs and expenses - related parties: |  |  |  |  |  |
Total costs and expenses - related parties |  |  | $ 19.1 | $ 24.5 | $ 21.8 |

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