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Equity and Distributions, Issuances of Equity (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |
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Feb. 26, 2016 USD ($) shares | Jan. 31, 2016 USD ($) shares | Nov. 30, 2013 USD ($) $ / shares shares | Feb. 28, 2013 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2009 | Aug. 02, 2015 USD ($) | Mar. 31, 2015 $ / shares
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Net cash proceeds from the issuance of common units | $ |  |  |  |  | $ 1,188.6 | $ 388.8 | $ 1,792.0 |  |  |
Split of limited partner units ratio |  |  |  |  |  | 2 |  |  |  |
Class B Units [Member] |  |  |  |  |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Common unit exchange ratio in connection with merger |  |  |  |  |  |  |  | 1.24 |  |
Treasury Units [Member] |  |  |  |  |  |  |  |  |  |
Treasury Units [Abstract] |  |  |  |  |  |  |  |  |  |
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 | $ |  |  |  |  | $ 33.6 |  |  |  |  |
Shelf Registration 2010 [Member] |  |  |  |  |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  |  |  | 18,400,000 |  |  |  |  |  |
Over-allotment of common units included in offering (in units) |  |  |  | 2,400,000 |  |  |  |  |  |
Offering price of common unit (in dollars per unit) | $ / shares |  |  |  | $ 27.28 |  |  |  |  |  |
Net cash proceeds from the issuance of common units | $ |  |  |  | $ 486.6 |  |  |  |  |  |
Senior notes issued under universal shelf registration | $ |  |  |  |  |  |  | $ 2,250.0 |  |  |
Shelf Registration 2013 [Member] |  |  |  |  |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  |  | 18,400,000 |  |  |  |  |  |  |
Over-allotment of common units included in offering (in units) |  |  | 2,400,000 |  |  |  |  |  |  |
Offering price of common unit (in dollars per unit) | $ / shares |  |  | $ 31.03 |  |  |  |  |  |  |
Net cash proceeds from the issuance of common units | $ |  |  | $ 553.0 |  |  |  |  |  |  |
Senior notes issued under universal shelf registration | $ |  |  |  |  | 2,500.0 | $ 4,750.0 |  |  |  |
At-the-Market Registration [Member] |  |  |  |  |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum common units authorized for issuance | $ |  |  |  |  | 1,920.0 |  |  |  | $ 1,250.0 |
Remaining units available for issuance | $ |  |  |  |  | $ 1,860.0 |  |  |  | $ 424.6 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  |  |  |  | 25,520,424 | 1,590,334 | 15,249,378 |  |  |
Gross proceeds from the sale of common units | $ |  |  |  |  | $ 825.4 | $ 58.3 | $ 460.4 |  |  |
Net cash proceeds from the issuance of common units | $ |  |  |  |  | $ 817.4 | $ 57.7 | $ 456.3 |  |  |
At-the-Market Registration [Member] | EPCO and affiliates [Member] |  |  |  |  |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  | 3,830,256 |  |  | 3,225,057 |  |  |  |  |
Offering price of common unit (in dollars per unit) | $ / shares |  |  |  |  |  |  |  |  |  | $ 31.01
Net cash proceeds from the issuance of common units | $ |  | $ 100.0 |  |  | $ 100.0 |  |  |  |  |
Distribution Reinvestment Plan [Member] |  |  |  |  |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum common units authorized for issuance (in units) |  |  |  |  | 140,000,000 |  |  |  |  |
Remaining units available for issuance (in units) |  |  |  |  | 15,067,998 |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  |  |  |  | 12,413,351 | 9,480,407 | 10,024,828 |  |  |
Net cash proceeds from the issuance of common units | $ |  |  |  |  | $ 359.8 | $ 321.3 | $ 287.6 |  |  |
Distribution Reinvestment Plan [Member] | EPCO and affiliates [Member] |  |  |  |  |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) | 4,481,504 |  |  |  |  |  |  |  |  |
Net cash proceeds from the issuance of common units | $ | $ 100.0 |  |  |  | $ 100.0 | $ 100.0 |  |  |  |
Employee Unit Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum common units authorized for issuance (in units) |  |  |  |  | 8,000,000 |  |  |  |  |
Remaining units available for issuance (in units) |  |  |  |  | 6,772,506 |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |  |  |  |  |
Number of common units issued (in units) |  |  |  |  | 380,562 | 273,820 | 283,426 |  |  |
Net cash proceeds from the issuance of common units | $ |  |  |  |  | $ 11.4 | $ 9.8 | $ 8.5 |  |  |

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