Acquisition of Oiltanking Partners, L.P., Purchase Price Allocation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 02, 2014
Liabilities assumed in business combination:
Goodwill	$ 4,199.9		$ 2,080.0	$ 2,086.8	$ 2,092.3
Oiltanking Partners L.P. - Step 1 [Member]
Consideration:
Cash	2,438.3
Equity instruments (54,807,352 common units of Enterprise)	2,171.5	[1]
Fair value of total consideration transferred in Step 1	4,609.8
Indentifiable assets acquired in business combination:
Current assets, including cash of $21.5 million						68.0
Property, plant, and equipment						1,080.1
Identifiable intangible assets:
Intangible assets						2,949.1
Other assets						227.6
Total assets acquired						4,324.8
Liabilities assumed in business combination:
Current liabilities						(84.8)
Long-term debt						(223.3)
Other long-term liabilities						(129.7)	[2]
Total liabilities assumed						(437.8)
Noncontrolling interest in Oiltanking						(1,397.2)	[3]
Total assets acquired less liabilities assumed and noncontrolling interest						2,489.8
Total consideration given for ownership interests in Oiltanking in Step 1	4,609.8
Goodwill						2,120.0
Oiltanking Acquisition:
Cash acquired						21.5
Common units issued in connection with acquisition of Oiltanking (in units)	54,807,352
Common unit price (in dollars per share)						$ 39.62
Liquidity Option Agreement						119.4
Noncontrolling interests:
Inputs to calculate noncontrolling interests	28,328,890 Oiltanking common units at $49.32 per unit
Total related party notes receivable						228.3
Current portion of related party notes receivable						5
Long-term portion of related party notes receivable						223.3
Accrued interest						2.5
Oiltanking Partners L.P. - Step 1 [Member] | Minimum [Member]
Noncontrolling interests:
Cash flow projections discount rate (in hundredths)	5.50%
Oiltanking Partners L.P. - Step 1 [Member] | Maximum [Member]
Noncontrolling interests:
Cash flow projections discount rate (in hundredths)	8.50%
Oiltanking Partners L.P. - Step 1 [Member] | Real Property [Member]
Indentifiable assets acquired in business combination:
Property, plant, and equipment						95.4
Oiltanking Partners L.P. - Step 1 [Member] | Personal Property [Member]
Indentifiable assets acquired in business combination:
Property, plant, and equipment						984.7
Oiltanking Partners L.P. - Step 1 [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets:
Intangible assets						1,192.4	[4]
Oiltanking Acquisition:
Weighted-average amortization period (in years)	29 years
Oiltanking Partners L.P. - Step 1 [Member] | Contract-based intangibles [Member]
Identifiable intangible assets:
Intangible assets						297.5	[4]
Oiltanking Acquisition:
Weighted-average amortization period (in years)	6 years
Oiltanking Partners L.P. - Step 1 [Member] | Incentive distribution rights [Member]
Identifiable intangible assets:
Intangible assets						$ 1,459.2

[1] The fair value of the equity-based consideration paid in connection with Step 1 of the Oiltanking acquisition was based on the closing market price of Enterprise's common units of $39.62 per unit on the acquisition date.

[2] Other long-term liabilities includes $119.4 million for the Liquidity Option Agreement. The fair value assigned to the Liquidity Option Agreement is provisional pending completion of certain tax-related computations. See Note 18 for information regarding this agreement.

[3] From an accounting perspective, Enterprise acquired control of Oiltanking as a result of completing Step 1. In accordance with ASC 805, Business Combinations, the estimated fair value of Oiltanking's common units held by parties other than Enterprise following Step 1 (i.e., the "noncontrolling interest") is based on 28,328,890 common units held by third parties on October 1, 2014 multiplied by the closing unit price for Oiltanking common units on that date of $49.32 per unit.

[4] The weighted-average amortization period for the customer relationship intangible assets is 29 years and for the contract-based intangible assets is six years.