Equity-Based Awards, Profits Interest Awards (Details) - Profits Interest Awards [Member] $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
EPD PubCo I [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Enterprise common units contributed to Employee Partnership by EPCO Holdings (in units) | shares	2,723,052
Class A capital base	$ 63.7	[1]
Class A preference return | $ / shares	$ 0.39	[2]
Expected vesting/liquidation date	Feb. 01, 2020
Estimated grant date fair value of profits interest awards	$ 13.0	[3]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation cost	$ 5.9	[4]
Recognition period for total unrecognized compensation cost	1 year 7 months 6 days
Estimated Grant Date Fair Value Assumptions [Abstract]
Expected life of award	4 years
EPD PubCo I [Member] | Minimum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	0.90%
Expected distribution yield	6.20%
Expected unit price volatility	20.00%
EPD PubCo I [Member] | Maximum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	2.50%
Expected distribution yield	7.00%
Expected unit price volatility	40.00%
EPD PubCo II [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Enterprise common units contributed to Employee Partnership by EPCO Holdings (in units) | shares	2,834,198
Class A capital base	$ 66.3	[1]
Class A preference return | $ / shares	$ 0.39	[2]
Expected vesting/liquidation date	Feb. 01, 2021
Estimated grant date fair value of profits interest awards	$ 14.7	[3]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation cost	$ 8.3	[4]
Recognition period for total unrecognized compensation cost	2 years 7 months 6 days
Estimated Grant Date Fair Value Assumptions [Abstract]
Expected life of award	5 years
EPD PubCo II [Member] | Minimum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	1.10%
Expected distribution yield	6.10%
Expected unit price volatility	27.00%
EPD PubCo II [Member] | Maximum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	2.70%
Expected distribution yield	7.00%
Expected unit price volatility	40.00%
EPD PubCo III [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Enterprise common units contributed to Employee Partnership by EPCO Holdings (in units) | shares	105,000
Class A capital base	$ 2.5	[1]
Class A preference return | $ / shares	$ 0.39	[2]
Expected vesting/liquidation date	Apr. 01, 2020
Estimated grant date fair value of profits interest awards	$ 0.5	[3]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation cost	$ 0.3	[4]
Recognition period for total unrecognized compensation cost	1 year 9 months 18 days
Estimated Grant Date Fair Value Assumptions [Abstract]
Expected life of award	4 years
EPD PubCo III [Member] | Minimum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	1.00%
Expected distribution yield	6.10%
Expected unit price volatility	27.00%
EPD PubCo III [Member] | Maximum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	2.20%
Expected distribution yield	6.80%
Expected unit price volatility	40.00%
EPD PrivCo I [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Enterprise common units contributed to Employee Partnership by EPCO Holdings (in units) | shares	1,111,438
Class A capital base	$ 26.0	[1]
Class A preference return | $ / shares	$ 0.39	[2]
Expected vesting/liquidation date	Feb. 01, 2021
Estimated grant date fair value of profits interest awards	$ 5.8	[3]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation cost	$ 0.7	[4]
Recognition period for total unrecognized compensation cost	2 years 7 months 6 days
Estimated Grant Date Fair Value Assumptions [Abstract]
Expected life of award	5 years
EPD PrivCo I [Member] | Minimum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	1.20%
Expected distribution yield	6.10%
Expected unit price volatility	28.00%
EPD PrivCo I [Member] | Maximum [Member]
Estimated Grant Date Fair Value Assumptions [Abstract]
Risk-free interest rate	1.60%
Expected distribution yield	6.70%
Expected unit price volatility	40.00%

[1] Represents fair market value of the Enterprise common units contributed to each Employee Partnership at the applicable contribution date.

[2] Each quarter, the Class A limited partner in each Employee Partnership is paid a cash distribution equal to the product of (i) the number of common units owned by the Employee Partnership and (ii) the Class A Preference Return of $0.39 per unit (subject to equitable adjustment in order to reflect any equity split, equity distribution or dividend, reverse split, combination, reclassification, recapitalization or other similar event affecting such common units). To the extent that the Employee Partnership has cash remaining after making this quarterly payment to the Class A limited partner, the residual cash is distributed to the Class B limited partners on a quarterly basis.

[3] Represents the total grant date fair value of the profits interest awards irrespective of how such costs will be allocated between us and EPCO and its privately held affiliates.

[4] Represents our expected share of the unrecognized compensation cost at June 30, 2018. We expect to recognize our share of the unrecognized compensation cost for PubCo I, PubCo II, PubCo III and PrivCo I over a weighted-average period of 1.6 years, 2.6 years, 1.8 years and 2.6 years, respectively.