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Equity-Based Awards, Unit Option Awards (Details) - Unit Option Awards [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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) | 1,270,000 | [1] | 4,050,000 |  | 5,522,280
Exercised (in units) | (1,270,000) |  | (2,720,000) |  | (1,472,280)
Forfeited (in units) |  |  | (60,000) |  |
End of period (in units) | 0 |  | 1,270,000 | [1] | 4,050,000
Options outstanding, weighted-average strike price [Roll Forward] |  |  |  |  |
Weighted average strike price, beginning of period (in dollars per unit) | $ 16.14 |  | $ 13.24 |  | $ 13.71
Weighted average strike price, exercised (in dollars per unit) | 16.14 |  | 11.83 |  | 14.98
Weighted average strike price, forfeited (in dollars per unit) |  |  | 16.14 |  |
Weighted average strike price, end of period (in dollars per unit) | $ 0 |  | $ 16.14 |  | $ 13.24
Total intrinsic value of unit option awards exercised during period | $ 21.7 |  | $ 57.5 |  | $ 19.8
Cash received from EPCO in connection with the exercise of unit option awards | 13.1 |  | 33.4 |  | 11.5
Unit option award-related cash reimbursements to EPCO | $ 21.7 |  | $ 57.5 |  | $ 19.8
[1] | All of the unit option awards outstanding at December 31, 2014 vested during 2014 and were exercised during 2015.

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- Definition Reimbursement to private company affiliate for the cash difference between the strike price paid by the employee and the actual price paid for the units issued to the employee. + References No definition available. + Details
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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 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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