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