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Equity-based Awards, Unit Option Awards (Details) - Unit Option Awards [Member] - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
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] |  |  | 1,270,000 |
Exercised (in units) |  |  |  | (1,080,000) |
End of period (in units) | [1] | 190,000 |  | 190,000 |
Options outstanding, weighted-average strike price [Roll Forward] |  |  |  |  |
Weighted average strike price, beginning of period (in dollars per unit) |  |  |  | $ 16.14 |
Weighted average strike price, exercised (in dollars per unit) |  |  |  | 16.14 |
Weighted average strike price, end of period (in dollars per unit) |  | $ 16.14 |  | $ 16.14 |
Weighted average remaining contractual term |  |  |  | 3 months 18 days |
Aggregate intrinsic value | [2] | $ 1.7 |  | $ 1.7 |
Total intrinsic value of unit option awards exercised during period |  | 0.2 | $ 0.0 | 19.8 | $ 57.5
Cash received from EPCO in connection with the exercise of unit option awards |  | 0.2 | 0.0 | 11.5 | 33.4
Unit option award-related cash reimbursements to EPCO |  | $ 0.2 | $ 0.0 | $ 19.8 | $ 57.5
[1] | All of the unit option awards outstanding at September 30, 2015 were exercisable. None of the unit option awards outstanding at December 31, 2014 were exercisable.
[2] | Aggregate intrinsic value reflects fully vested unit option awards at the dates indicated.

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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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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