Consolidated Statements of Changes in Members' Equity (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Members' Equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 7,232.6	$ 6,971.1
Unit-based compensation	13.9
Issuance of units by the Partnership	362.2
Conversion of restricted units for common, net of units withheld for taxes	(2.7)
Conversion of the Partnership's restricted units to common units	(2.4)
Change in equity due to issuance of units by the partnership	(5.0)
Non-controlling interest distributions	(85.8)
Non-controlling interest contribution	2.8
Distributions to members	(38.8)us-gaap_DividendsCommonStockCash
Tax benefit from vesting of restricted units	1.1
Adjustment related to mandatory redemption of E2 non-controlling interest	(5.4)
Redeemable non-controlling interest	(4.9)
Contribution from Devon to the Partnership	2.2enlc_ContributionByAffiliate
Net income	24.3us-gaap_ProfitLoss
Increase (Decrease) in Temporary Equity
Redeemable Noncontrolling Interest Reclassifications Between Permanen And Temporary Equity	4.9
Redeemable Noncontrolling Interest, Equity, Carrying Amount	4.9	0
Common Units
Increase (Decrease) in Members' Equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,765.8	2,774.3
Common Stock, Shares, Outstanding	164.2	164.1
Unit-based compensation	7.1
Conversion of restricted units for common, net of units withheld for taxes	(2.7)
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings	0.1
Change in equity due to issuance of units by the partnership	8.5
Distributions to members	(38.8)
Tax benefit from vesting of restricted units	1.1
Net income	16.3
Non-Controlling Interest
Increase (Decrease) in Members' Equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4,466.8	4,196.8
Unit-based compensation	6.8
Issuance of units by the Partnership	362.2
Conversion of the Partnership's restricted units to common units	(2.4)
Change in equity due to issuance of units by the partnership	(13.5)
Non-controlling interest distributions	(85.8)
Non-controlling interest contribution	2.8
Adjustment related to mandatory redemption of E2 non-controlling interest	(5.4)
Redeemable non-controlling interest	(4.9)
Contribution from Devon to the Partnership	2.2
Net income	$ 8.0

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The cash outflow to pay taxes for the conversion of restricted units for common units.

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As of reporting date, the carrying amount of noncontrolling interest which are mandatorily redeemable by the entity.

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Represents an increase (decrease) in equity due to reclassifications between permanent and temporary equity recorded during the period. Amounts reclassified from permanent equity to temporary equity relate to an agreement that gives the non-controlling interest holder a contingent option to put a portion of its interest to the reporting entity. Amounts reclassified from temporary equity to permanent equity relate to the portion of the put option that lapses during the period thereby reducing the amount that may be put to the reporting entity.

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Represents an increase (decrease) in temporary equity due to reclassifications between permanent and temporary equity recorded during the period. Amounts reclassified from permanent equity to temporary equity relate to an agreement that gives the non-controlling interest holder a contingent option to put a portion of its interest to the reporting entity. Amounts reclassified from temporary equity to permanent equity relate to the portion of the put option that lapses during the period thereby reducing the amount that may be put to the reporting entity.

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Total change in each class of partners' capital accounts during the year due to unit-based compensation. All partners include general, limited and preferred partners.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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