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Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues - related parties: |  |  |
Total revenue - related parties | $ 45.0 | $ 56.7 | $ 72.3
Costs and expenses - related parties: |  |  |
Operating costs and expenses | 1,112.8 | 1,104.0 | 1,080.5
General and administrative expenses | 121.5 | 113.1 | 114.1
Total costs and expenses - related parties | 1,234.3 | 1,217.1 | $ 1,194.6
Accounts receivable - related parties: |  |  |
Total accounts receivable - related parties | 1.8 | 1.1 |
Accounts payable - related parties: |  |  |
Total accounts payable - related parties | $ 127.3 | $ 105.1 |
At-the-Market Registration [Member] |  |  |
Relationship with Affiliates [Abstract] |  |  |
Number of common units issued (in units) | 21,807,726 | 87,867,037 | 25,520,424
Gross proceeds from the sale of common units | $ 603.1 | $ 2,170.0 | $ 825.4
Distribution Reinvestment Plan [Member] |  |  |
Relationship with Affiliates [Abstract] |  |  |
Number of common units issued (in units) | 18,541,355 | 15,809,503 | 12,413,351
EPCO and its privately held affiliates [Member] |  |  |
Costs and expenses - related parties: |  |  |
Total costs and expenses - related parties | $ 1,010.9 | $ 963.2 | $ 949.3
Accounts payable - related parties: |  |  |
Total accounts payable - related parties | 99.3 | 88.9 |
Distributions: |  |  |
Total cash distributions | $ 1,120.0 | $ 1,070.0 | $ 948.3
Number of Designated Units excluded from distributions (in units) |  |  | 35,380,000
Relationship with Affiliates [Abstract] |  |  |
Number of Units (in units) | 689,767,023 |  |
Percentage of Total Units Outstanding | 32.00% |  |
Enterprise common units pledged as security (in units) | 81,346,154 |  |
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) | 4,246,498 |  |
Gross proceeds from the sale of common units | $ 100.0 | 100.0 | 100.0
EPCO and its privately held affiliates [Member] | Administrative Services Agreement [Member] |  |  |
Costs and expenses - related parties: |  |  |
Operating costs and expenses | 882.1 | 840.7 | 826.4
General and administrative expenses | 110.4 | 105.3 | 105.2
Total costs and expenses - related parties | 992.5 | 946.0 | 931.6
Unconsolidated affiliates [Member] |  |  |
Revenues - related parties: |  |  |
Total revenue - related parties | 45.0 | 56.7 | 72.3
Costs and expenses - related parties: |  |  |
Total costs and expenses - related parties | 223.4 | 253.9 | 245.3
Accounts receivable - related parties: |  |  |
Total accounts receivable - related parties | 1.8 | 1.1 |
Accounts payable - related parties: |  |  |
Total accounts payable - related parties | 28.0 | 16.2 |
Unconsolidated affiliates [Member] | Seaway Crude Pipeline Company [Member] |  |  |
Revenues - related parties: |  |  |
Total revenue - related parties | 19.6 | 36.3 | 47.7
Costs and expenses - related parties: |  |  |
Total costs and expenses - related parties | 98.8 | 161.2 | 175.8
Unconsolidated affiliates [Member] | K/D/S Promix, L.L.C. [Member] |  |  |
Revenues - related parties: |  |  |
Total revenue - related parties | 7.8 | 7.0 | 8.8
Costs and expenses - related parties: |  |  |
Total costs and expenses - related parties | 27.8 | 27.1 | 24.9
Unconsolidated affiliates [Member] | Texas Express Pipeline LLC [Member] |  |  |
Costs and expenses - related parties: |  |  |
Total costs and expenses - related parties | 29.5 | 22.8 | 6.7
Unconsolidated affiliates [Member] | Eagle Ford Pipeline LLC [Member] |  |  |
Costs and expenses - related parties: |  |  |
Total costs and expenses - related parties | 42.8 | 36.2 | 39.4
Unconsolidated affiliates [Member] | Management/Operator Fees [Member] |  |  |
Costs and expenses - related parties: |  |  |
Total costs and expenses - related parties | $ (10.6) | $ (10.7) | $ (19.1)

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