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Equity and Distributions, Issuances of Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014 | Jan. 31, 2019
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Common units issued in connection with acquisition of Oiltanking (in units) |  |  |  |  | 54,807,352 |
Limited partner interests of Oiltanking acquired |  |  |  |  | 65.90% |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Net cash proceeds from the issuance of common units |  | $ 538.4 | $ 1,073.4 | $ 2,542.8 |  |
Common units issued in connection with employee compensation (in units) |  | 1,443,586 | 1,176,103 |  |  |
Common units issued in connection with employee compensation |  | $ 39.1 | $ 33.7 |  |  |
Treasury Units: |  |  |  |  |  |
Total of common units repurchased under a buyback program (in units) |  | 1,236,800 |  |  |  |
Common units acquired in connection with buyback program |  | $ 30.8 |  |  |  |
Acquisition of treasury units in connection with vesting of equity-based awards (in units) |  | 1,037,522 | 1,027,798 | 1,000,619 |  |
Phantom Unit Awards [Member] |  |  |  |  |  |
Treasury Units: |  |  |  |  |  |
Phantom units vesting during the period (in units) |  | 3,479,958 | 2,490,081 | 1,761,455 |  |
Treasury Units [Member] |  |  |  |  |  |
Treasury Units: |  |  |  |  |  |
Maximum common units authorized for repurchase under a buyback program (in units) |  | 4,000,000 |  |  |  |
Total of common units repurchased under a buyback program (in units) |  | 1,236,800 |  |  |  |
Common units acquired in connection with buyback program |  | $ 30.8 |  |  |  |
Average price of treasury units acquired under buyback program (dollars per unit) |  | $ 24.92 |  |  |  |
Acquisition of treasury units in connection with vesting of equity-based awards (in units) |  | 1,037,522 |  |  |  |
Common units acquired in connection with phantom unit awards |  | $ 27.3 |  |  |  |
Treasury Units [Member] | Subsequent Event [Member] |  |  |  |  |  |
Treasury Units: |  |  |  |  |  |
Amount authorized under buyback program |  |  |  |  |  | $ 2,000.0
Junior Debt Obligations [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Debt issued under universal shelf registration |  | 700.0 | $ 1,700.0 |  |  |
Universal Shelf Registration [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Debt issued under universal shelf registration |  | 5,700.0 |  |  |  |
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 |  |
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 |  |
Gross proceeds from the sale of common units |  |  | $ 603.1 | $ 2,170.0 |  |
Net cash proceeds from the issuance of common units |  |  | $ 597.0 | $ 2,160.0 |  |
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 |  |
Gross proceeds from the sale of common units |  |  |  | $ 100.0 |  |
Distribution Reinvestment Plan [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Number of common units issued (in units) |  | 19,316,781 | 18,541,355 | 15,809,503 |  |
Net cash proceeds from the issuance of common units |  | $ 523.3 | $ 462.9 | $ 374.0 |  |
Distribution reinvestment plan discount rate |  | 2.50% |  |  |  |
Remaining units available for issuance (in units) |  | 61,400,359 |  |  |  |
Distribution Reinvestment Plan [Member] | Forecast [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Distribution reinvestment plan discount rate | 0.00% |  |  |  |  |
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] |  |  |  |  |  |
Gross proceeds from the sale of common units |  | $ 213.0 | 100.0 | 100.0 |  |
Net cash proceeds from the issuance of common units |  | $ 213.0 | $ 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) |  | 545,170 | 504,664 | 507,031 |  |
Net cash proceeds from the issuance of common units |  | $ 15.1 | $ 13.5 | $ 12.7 |  |
Remaining units available for issuance (in units) |  | 5,215,641 |  |  |  |

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