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Equity and Distributions, Issuances of Equity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Net cash proceeds from the issuance of common units | $ 177.0 | $ 448.8
Common units issued in connection with employee compensation | $ 39.1 | $ 33.7
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) | 1,443,586 |
Common units issued in connection with employee compensation | $ 39.1 |
Universal Shelf Registration [Member] |  |
Registration Statements and Equity Offerings [Line Items] |  |
Debt issued under universal shelf registration | 2,700.0 |
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 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Number of common units issued (in units) |  | 12,865,371
Gross proceeds from the sale of common units |  | $ 359.7
Net cash proceeds from the issuance of common units |  | $ 356.0
Distribution Reinvestment Plan [Member] |  |
Registration Statements and Equity Offerings [Line Items] |  |
Remaining units available for issuance (in units) | 74,207,487 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Number of common units issued (in units) | 6,509,653 | 3,325,798
Net cash proceeds from the issuance of common units | $ 173.3 | $ 89.6
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 | 100.0 |
Net cash proceeds from the issuance of common units | $ 100.0 |
Employee Unit Purchase Plan [Member] |  |
Registration Statements and Equity Offerings [Line Items] |  |
Remaining units available for issuance (in units) | 5,628,178 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |
Number of common units issued (in units) | 132,633 | 114,761
Net cash proceeds from the issuance of common units | $ 3.7 | $ 3.2

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