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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, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Summary of awards activity, options [Roll Forward] |  |  |  |  |  |  |  |
Beginning of period (in units) |  |  |  | 2,761,140 |  |  |  |
Exercised (in units) |  |  |  | (736,140) |  |  |  |
End of period (in units) | 2,025,000 |  |  | 2,025,000 |  |  | 2,761,140 |
Options outstanding, weighted-average strike price [Roll Forward] |  |  |  |  |  |  |  |
Weighted average strike price, beginning of period (in dollars per unit) |  |  |  | $ 27.41 |  |  |  |
Weighted average strike price, exercised (in dollars per unit) |  |  |  | $ 29.95 |  |  |  |
Weighted average strike price, end of period (in dollars per unit) | $ 26.49 |  |  | $ 26.49 |  |  | $ 27.41 |
Weighted average remaining contractual term |  |  |  | 1 year 10 months |  |  | 2 years |
Aggregate intrinsic value | $ 51.4 | [1] |  | $ 51.4 | [1] |  | $ 13.0 | [1]
Exercisable (in units) | 0 |  |  | 0 |  |  |  |
Exercisable - Weighted average strike price (in dollars per unit) | $ 0 |  |  | $ 0 |  |  |  |
Exercisable - Weighted average remaining contractual term (in years) |  |  |  | 0 years |  |  |  |
Exercisable - Aggregate intrinsic value | 0 | [1] |  | 0 | [1] |  |  |
Total intrinsic value of unit option awards exercised during period | 3.4 |  | 0 | 19.8 |  | 14.0 |  |
Cash received from EPCO in connection with the exercise of unit option awards | 2.0 |  | 0 | 11.5 |  | 10.2 |  |
Unit option award-related cash reimbursements to EPCO | 3.4 |  | 0 | 19.8 |  | 14.0 |  |
Unrecognized Compensation Expense [Abstract] |  |  |  |  |  |  |  |
Unrecognized compensation cost | 0.3 |  |  | 0.3 |  |  |  |
Recognition period for total unrecognized compensation cost |  |  |  | 0 years 7 months |  |  |  |
Enterprise [Member] |  |  |  |  |  |  |  |
Unrecognized Compensation Expense [Abstract] |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ 0.3 |  |  | $ 0.3 |  |  |  |
[1] | Aggregate intrinsic value reflects fully vested unit option awards at the date 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 Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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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- 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 The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -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 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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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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