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Equity-based Awards, Unit Option Awards (Details) (Unit Option Awards [Member], USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Unit Option Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 4 years |  |  |  |
Summary of awards activity, options [Roll Forward] |  |  |  |  |
Beginning of period (in units) | 2,761,140 | [1],[2] | 3,753,420 |  |
Exercised (in units) | (736,140) |  | (742,280) |  |
Forfeited (in units) |  |  | (250,000) |  |
End of period (in units) | 2,025,000 | [1],[2] | 2,761,140 | [1],[2] | 3,753,420
Options outstanding, weighted-average strike price [Roll Forward] |  |  |  |  |
Weighted average strike price, beginning of period (in dollars per unit) | $ 27.41 | [1],[2] | $ 28.08 |  |
Weighted average strike price, exercised (in dollars per unit) | $ 29.95 |  | $ 30.77 |  |
Weighted average strike price, forfeited (in dollars per unit) |  |  | $ 27.45 |  |
Weighted average strike price, end of period (in dollars per unit) | $ 26.49 | [1],[2] | $ 27.41 | [1],[2] | $ 28.08
Weighted average remaining contractual term | 1 year 3 months 18 days |  |  |  |
Aggregate intrinsic value | $ 57.0 | [1],[2],[3] |  |  |
Exercisable (in units) | 0 |  | 0 |  | 0
Option awards vested during period (in units) | 1,330,000 |  |  |  |
Awards exercisable in 2014 (in units) | 1,330,000 |  |  |  |
Option awards vested in 2014 | 695,000 |  |  |  |
Awards exercisable in 2015 (in units) | 695,000 |  |  |  |
Total intrinsic value of unit option awards exercised during period | 19.8 |  | 14.6 |  | 0
Cash received from EPCO in connection with the exercise of unit option awards | 11.5 |  | 10.2 |  | 0
Unit option-related cash reimbursements to EPCO | 19.8 |  | 14.0 |  | 0
Unrecognized Compensation Expense [Abstract] |  |  |  |  |
Unrecognized compensation cost | $ 0.1 |  |  |  |
[1] | At December 31, 2013 and 2012, we were committed to issue 2,025,000 and 2,761,140, respectively, of our common units if all outstanding unit option awards were exercised. Option awards outstanding at December 31, 2013 include 1,330,000 awards that vested during 2013 and became exercisable beginning in February 2014. Of the remaining outstanding option awards at December 31, 2013, 695,000 will vest in 2014 and become exercisable in 2015.
[2] | None of the unit option awards outstanding at December 31, 2013, 2012 and 2011 were exercisable.
[3] | Aggregate intrinsic value reflects fully vested unit option awards at the date indicated.

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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