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Equity-based Awards, Other Awards (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Equity-based compensation expense [Abstract] |  |  |  |
Total compensation expense | $ 60.0 | $ 50.9 | $ 70.4 |
Holdings Merger [Member] |  |  |  |
Summary of awards activity, equity instruments other than options [Roll Forward] |  |  |  |
Common unit exchange ratio in connection with merger |  |  | 1.5 |
Unit Appreciation Rights [Member] |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |
Total compensation expense | 0.9 | (0.4) | 3.1 |
Summary of awards activity, equity instruments other than options [Roll Forward] |  |  |  |
Beginning of period (in units) | 107,328 | 170,104 | 232,196 |
Vested (in units) | (107,328) | (17,776) |  |
Settled, forfeited or cancelled (in units) |  | (45,000) | (197,092) | [1]
Awards assumed by Enterprise in connection with the Holdings Merger (in units) |  |  | 135,000 | [2]
End of period (in units) | 0 | 107,328 | 170,104 |
Unit Appreciation Rights [Member] | Enterprise [Member] |  |  |  |
Summary of awards activity, equity instruments other than options [Roll Forward] |  |  |  |
Beginning of period (in units) | 107,328 | 170,104 | 142,196 |
Vested (in units) | (107,328) | (17,776) |  |
Settled, forfeited or cancelled (in units) |  | (45,000) | (107,092) | [1]
Awards assumed by Enterprise in connection with the Holdings Merger (in units) |  |  | 135,000 | [2]
End of period (in units) | 0 | 107,328 | 170,104 |
Unit Appreciation Rights [Member] | Holdings [Member] |  |  |  |
Summary of awards activity, equity instruments other than options [Roll Forward] |  |  |  |
Beginning of period (in units) | 0 | 0 | 90,000 |
Vested (in units) | 0 | 0 |  |
Settled, forfeited or cancelled (in units) |  | 0 | (90,000) | [1]
Awards assumed by Enterprise in connection with the Holdings Merger (in units) |  |  | 0 | [2]
End of period (in units) | 0 | 0 | 0 |
Cash paid to settle equity-based awards during period |  |  | 2.5 |
Employee Partnerships [Member] |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |
Total compensation expense |  |  | 31.3 |
Employee Partnerships [Abstract] |  |  |  |
Costs recognized in connection with liquidation of Employee Partnerships |  |  | 26.8 |
Changes in the aggregate grant date fair value of the Employee Partnerships [Roll Forward] |  |  |  |
Liquidation of partnerships |  |  | $ 51.3 |
[1] | Prior to the Holdings Merger, the non-employee directors of DEP GP, the general partner of Duncan Energy Partners, were granted 90,000 UARs denominated in Holdings units in connection with certain letter agreements. The compensation expense and associated liability for these UARs was recognized by Enterprise since it owned DEP GP. At the effective date of the Holdings Merger in November 2010, these UARs were settled and $2.5 million in cash was paid to award recipients.
[2] | At the effective date of the Holdings Merger, Enterprise assumed 90,000 UARs that had been issued by Holdings GP to its non-employee directors. Since these UARs were denominated in Holdings units, they converted into 135,000 Enterprise UARs based on the 1.5:1 merger exchange ratio.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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