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Equity-Based Awards, Profits Interest Awards (Details) - Profits Interest Awards [Member] $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 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 | $ 5.3 | [4]
Recognition period for total unrecognized compensation cost | 1 year 4 months 24 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 | 5.90% |
Expected unit price volatility | 19.00% |
EPD PubCo I [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 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 | $ 14.9 | [3]
Unrecognized Compensation Expense [Abstract] |  |
Unrecognized compensation cost | $ 8.1 | [4]
Recognition period for total unrecognized compensation cost | 2 years 4 months 24 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 | 5.90% |
Expected unit price volatility | 24.00% |
EPD PubCo II [Member] | Maximum [Member] |  |
Estimated Grant Date Fair Value Assumptions [Abstract] |  |
Risk-free interest rate | 2.80% |
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 | $ 0.2 | [4]
Recognition period for total unrecognized compensation cost | 1 year 6 months |
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 | $ 0.6 | [4]
Recognition period for total unrecognized compensation cost | 2 years 4 months 24 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 September 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 1.4 years, 2.4 years, 1.5 years and 2.4 years, respectively.

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- Definition 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. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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