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Equity-based Awards, Unit Option Awards (Details) (Unit Option Awards [Member], USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
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) |  |  |  | 2,025,000 | [1] |  |  |
Exercised (in units) |  |  |  | (1,360,000) |  |  |  |
Forfeited (in units) |  |  |  | (30,000) |  |  |  |
End of period (in units) | 635,000 | [1] |  | 635,000 | [1] |  | 2,025,000 | [1]
Options outstanding, weighted-average strike price [Roll Forward] |  |  |  |  |  |  |  |
Weighted average strike price, beginning of period (in dollars per unit) |  |  |  | $ 26.49 |  |  |  |
Weighted average strike price, exercised (in dollars per unit) |  |  |  | $ 23.66 |  |  |  |
Weighted average strike price, forfeited (in dollars per unit) |  |  |  | $ 32.27 |  |  |  |
Weighted average strike price, end of period (in dollars per unit) | $ 32.27 |  |  | $ 32.27 |  |  | $ 26.49 |
Weighted average remaining contractual term |  |  |  | 1 year 6 months |  |  | 1 year 3 months 18 days |
Aggregate intrinsic value | $ 29.2 | [2] |  | $ 29.2 | [2] |  | $ 57.0 | [2]
Total intrinsic value of unit option awards exercised during period | 2.8 |  | 3.4 | 57.5 |  | 19.8 |  |
Cash received from EPCO in connection with the exercise of unit option awards | 1.6 |  | 2.0 | 33.4 |  | 11.5 |  |
Unit option award-related cash reimbursements to EPCO | $ 2.8 |  | $ 3.4 | $ 57.5 |  | $ 19.8 |  |
[1] | None of the unit option awards outstanding at June 30, 2014 and December 31, 2013 were exercisable as of such dates, respectively.
[2] | 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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that 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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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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