Equity and Distributions, Issuances of Equity (Details) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	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