Equity and Distributions, Issuances of Equity (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Net Cash Proceeds from Sale of Common Units [Abstract]
Net cash proceeds from the issuance of common units	$ 757.2	$ 1,888.3
At-the-Market Registration [Member]
Registration Statements and Equity Offerings [Line Items]
Maximum common units authorized for issuance	1,890.0
Remaining units available for issuance	$ 864.4
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units issued (in units)	20,857,006	68,645,180
Gross proceeds from the sale of common units	$ 577.3	$ 1,660.0
Net cash proceeds from the issuance of common units	$ 571.8	$ 1,650.0
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]
Registration Statements and Equity Offerings [Line Items]
Maximum common units authorized for issuance (in units)	240,000,000
Remaining units available for issuance (in units)	92,455,606
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units issued (in units)	6,802,889	10,104,741
Net cash proceeds from the issuance of common units	$ 179.0	$ 232.3
Distribution Reinvestment Plan [Member] | EPCO and its privately held affiliates [Member]
Net Cash Proceeds from Sale of Common Units [Abstract]
Net cash proceeds from the issuance of common units		$ 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)	6,032,683
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units issued (in units)	232,792	279,960
Net cash proceeds from the issuance of common units	$ 6.4	$ 6.8