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Equity and Distributions, Issuances of Equity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Registration Statements and Equity Offerings [Line Items] |  |  |  |
Common units issued in connection with acquisition of Oiltanking (in units) |  |  | 36,827,517 | 54,807,352
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Net cash proceeds from the issuance of common units | $ 1,073.4 | $ 2,542.8 | $ 1,188.6 |
Common units issued in connection with employee compensation (in units) | 1,176,103 |  |  |
Common units issued in connection with employee compensation | $ 33.7 |  |  |
Restricted Common Unit Awards [Member] |  |  |  |
Treasury Units: |  |  |  |
Conversion of restricted units to common units (in units) | 681,044 |  |  |
Acquisition of treasury units in connection with vesting of equity-based awards (in units) | 229,910 |  |  |
Phantom Unit Awards [Member] |  |  |  |
Treasury Units: |  |  |  |
Acquisition of treasury units in connection with vesting of equity-based awards (in units) | 797,888 |  |  |
Treasury Units [Member] |  |  |  |
Treasury Units: |  |  |  |
Maximum common units authorized for repurchase under a buy-back program (in units) | 4,000,000 |  |  |
Total of common units repurchased under a buy-back program (in units) | 2,763,200 |  |  |
Remaining common units available for repurchase (in units) | 1,236,800 |  |  |
Total cost of treasury units | $ 29.5 |  |  |
Junior Debt Obligations [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Debt issued under universal shelf registration | 1,700.0 |  |  |
Universal Shelf Registration [Member] | Senior Debt Obligations [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Debt issued under universal shelf registration |  | $ 1,250.0 | $ 2,500.0 |
Universal Shelf Registration [Member] | Junior Debt Obligations [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Debt issued under universal shelf registration | 1,700.0 |  |  |
At-the-Market Registration [Member] |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |
Maximum common units authorized for issuance | $ 2,540.0 |  |  |
Net Cash Proceeds from Sale of Common Units [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 |
Net cash proceeds from the issuance of common units | 597.0 | $ 2,160.0 | $ 817.4 |
Remaining units available for issuance | $ 2,540.0 |  |  |
At-the-Market Registration [Member] | EPCO and its privately held affiliates [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [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 |
Distribution Reinvestment Plan [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Number of common units issued (in units) | 18,541,355 | 15,809,503 | 12,413,351 |
Net cash proceeds from the issuance of common units | $ 462.9 | $ 374.0 | $ 359.8 |
Distribution reinvestment plan discount rate | 2.50% |  |  |
Remaining units available for issuance (in units) | 80,717,140 |  |  |
Distribution Reinvestment Plan [Member] | Minimum [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Distribution reinvestment plan discount rate range | 0.00% |  |  |
Distribution Reinvestment Plan [Member] | Maximum [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Distribution reinvestment plan discount rate range | 5.00% |  |  |
Distribution Reinvestment Plan [Member] | EPCO and its privately held affiliates [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [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 |
Net cash proceeds from the issuance of common units | $ 100.0 | $ 100.0 | $ 100.0 |
Employee Unit Purchase Plan [Member] |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |
Number of common units issued (in units) | 504,664 | 507,031 | 380,562 |
Net cash proceeds from the issuance of common units | $ 13.5 | $ 12.7 | $ 11.4 |
Remaining units available for issuance (in units) | 5,760,811 |  |  |

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