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Equity and Distributions, Issuances of Equity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Net cash proceeds from the issuance of common units | $ 42.7 | $ 177.0
Common units issued in connection with employee compensation (in units) | 1,626,041 |
Common units issued in connection with employee compensation | $ 45.6 | $ 39.1
Common units issued in connection with the vesting of phantom unit awards, net (in units) | 2,379,620 |
Treasury Units: |  |
Amount authorized under 2019 Buyback Program | $ 2,000.0 |
Remaining available capacity under the 2019 Buyback Program | $ 1,950.0 |
Total of common units repurchased under a buyback program (in units) | 1,852,392 |
Common units acquired in connection with buyback program | $ 51.6 |
Long-Term Incentive Plan (2008) [Member] |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Common units issued in connection with employee compensation (in units) | 1,626,041 |
Common units issued in connection with employee compensation | $ 45.6 |
Common units issued in connection with the vesting of phantom unit awards, net (in units) | 2,379,620 |
At-the-Market Registration [Member] |  |
Registration Statements and Equity Offerings [Line Items] |  |
Maximum common units authorized for issuance | $ 2,540.0 |
Remaining units available for issuance | $ 2,540.0 |
Distribution Reinvestment Plan [Member] |  |
Registration Statements and Equity Offerings [Line Items] |  |
Remaining units available for issuance (in units) | 60,032,214 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Number of common units issued (in units) | 1,368,145 | 6,509,653
Net cash proceeds from the issuance of common units | $ 38.5 | $ 173.3
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 | $ 7.0 |
Employee Unit Purchase Plan [Member] |  |
Registration Statements and Equity Offerings [Line Items] |  |
Remaining units available for issuance (in units) | 5,067,007 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Number of common units issued (in units) | 148,634 | 132,633
Net cash proceeds from the issuance of common units | $ 4.2 | $ 3.7

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