Equity and Distributions, Issuances of Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Cash Proceeds from Sale of Common Units [Abstract]
Net cash proceeds from the issuance of common units	$ 42.7	$ 177.0
Common units issued in connection with employee compensation (in units)	1,626,041
Common units issued in connection with employee compensation	$ 45.6	$ 39.1
Common units issued in connection with the vesting of phantom unit awards, net (in units)	2,379,620
Treasury Units:
Amount authorized under 2019 Buyback Program	$ 2,000.0
Remaining available capacity under the 2019 Buyback Program	$ 1,950.0
Total of common units repurchased under a buyback program (in units)	1,852,392
Common units acquired in connection with buyback program	$ 51.6
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)	1,626,041
Common units issued in connection with employee compensation	$ 45.6
Common units issued in connection with the vesting of phantom unit awards, net (in units)	2,379,620
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
Distribution Reinvestment Plan [Member]
Registration Statements and Equity Offerings [Line Items]
Remaining units available for issuance (in units)	60,032,214
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units issued (in units)	1,368,145	6,509,653
Net cash proceeds from the issuance of common units	$ 38.5	$ 173.3
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	$ 7.0
Employee Unit Purchase Plan [Member]
Registration Statements and Equity Offerings [Line Items]
Remaining units available for issuance (in units)	5,067,007
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units issued (in units)	148,634	132,633
Net cash proceeds from the issuance of common units	$ 4.2	$ 3.7