Equity and Distributions, Issuances of Equity (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Net Cash Proceeds from Sale of Common Units [Abstract]
Net cash proceeds from the issuance of common units				$ 82.2	$ 449.4
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)	163,550	120,831	2,379,620
Treasury Units:
Total of common units repurchased under a buyback program (in units)		1,056,736	1,852,392
Common units acquired in connection with buyback program	$ 0.0			$ 81.1
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)				2,664,001
2019 Buyback Program [Member]
Treasury Units:
Amount authorized under 2019 Buyback Program	2,000.0			$ 2,000.0
Remaining available capacity under the 2019 Buyback Program	1,920.0			$ 1,920.0
Total of common units repurchased under a buyback program (in units)				2,909,128
Common units acquired in connection with buyback program				$ 81.1
Universal Shelf Registration [Member] | Senior Notes [Member]
Registration Statements and Equity Offerings [Line Items]
Debt issued under universal shelf registration				2,500.0
At-the-Market Registration [Member]
Registration Statements and Equity Offerings [Line Items]
Maximum common units authorized for issuance	2,540.0			2,540.0
Remaining units available for issuance	$ 2,540.0			$ 2,540.0
Distribution Reinvestment Plan [Member]
Registration Statements and Equity Offerings [Line Items]
Remaining units available for issuance (in units)	57,544,841			57,544,841
Distribution reinvestment plan discount rate				0.00%		2.50%
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units issued (in units)				2,601,727	16,073,974
Net cash proceeds from the issuance of common units				$ 73.7	$ 438.1
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				$ 21.6
Employee Unit Purchase Plan [Member]
Registration Statements and Equity Offerings [Line Items]
Remaining units available for issuance (in units)	4,763,149			4,763,149
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units issued (in units)				296,263	403,602
Net cash proceeds from the issuance of common units				$ 8.5	$ 11.3
Employer contribution to EUPP	$ 0.5
Distribution Reinvestment and Employee Unit Purchase Plans [Member]
Net Cash Proceeds from Sale of Common Units [Abstract]
Number of common units purchased on the open market and delivered to participants (in units)	1,410,020