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Business Combinations, Purchase Price Allocation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jul. 02, 2015 | Oct. 02, 2014 | Dec. 31, 2013
Liabilities assumed in business combination: |  |  |  |  |  |  |
Goodwill |  | $ 5,745.2 | $ 5,745.2 | $ 4,300.2 |  |  | $ 2,080.0
Eagle Ford Midstream Assets [Member] |  |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |
Cash |  |  | 1,069.9 |  |  |  |
Accrued liability related to EFS Midstream acquisition |  |  | 986.6 |  |  |  |
Fair value of total consideration transferred |  |  | 2,056.5 |  |  |  |
Indentifiable assets acquired in business combination: |  |  |  |  |  |  |
Current assets, including cash |  |  |  |  | $ 64.0 |  |
Property, plant, and equipment |  |  |  |  | 636.0 |  |
Identifiable intangible assets: |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 1,409.8 |  |
Total assets acquired |  |  |  |  | 2,109.8 |  |
Liabilities assumed in business combination: |  |  |  |  |  |  |
Current liabilities |  |  |  |  | (9.6) |  |
Long-term debt |  |  |  |  | (125.0) |  |
Other long-term liabilities |  |  |  |  | (1.3) |  |
Total liabilities assumed |  |  |  |  | (135.9) |  |
Total assets acquired less liabilities assumed and noncontrolling interest |  |  |  |  | 1,973.9 |  |
Total consideration for acquisition |  |  | $ 2,056.5 |  |  |  |
Goodwill |  |  |  |  | 82.6 |  |
Business Combinations: |  |  |  |  |  |  |
Cash acquired |  |  |  |  | $ 13.4 |  |
Oiltanking Partners L.P. - Step 1 [Member] |  |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |
Cash |  |  |  | 2,438.3 |  |  |
Equity instruments (54,807,352 common units of Enterprise) | [1] |  |  | 2,171.5 |  |  |
Fair value of total consideration transferred |  |  |  | 4,609.8 |  |  |
Indentifiable assets acquired in business combination: |  |  |  |  |  |  |
Current assets, including cash |  |  |  |  |  | $ 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 | [2] |  |  |  |  | (230.0) |
Total liabilities assumed |  |  |  |  |  | (538.1) |
Noncontrolling interest in Oiltanking | [3] |  |  |  |  | (1,397.2) |
Total assets acquired less liabilities assumed and noncontrolling interest |  |  |  |  |  | 2,389.5 |
Total consideration for acquisition |  |  |  | $ 4,609.8 |  |  |
Goodwill |  |  |  |  |  | 2,220.3 |
Business Combinations: |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 219.7 |
Noncontrolling interests: |  |  |  |  |  |  |
Inputs to calculate noncontrolling interests |  | 28,328,890 Oiltanking common units at $49.32 per unit |  |  |  |  |
Oiltanking Partners L.P. - Step 1 [Member] | Customer relationship intangibles [Member] |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 1,192.4 |
Oiltanking Partners L.P. - Step 1 [Member] | Contract-based intangibles [Member] |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 297.5 |
Oiltanking Partners L.P. - Step 1 [Member] | Incentive distribution rights [Member] |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  |  |
Intangible assets | [4] |  |  |  |  | $ 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 our common units of $39.62 per unit on the acquisition date.
[2] | In connection with Step 1, we entered into the Liquidity Option Agreement with OTA and Marquard & Bahls ("M&B", a German corporation and ultimate parent company of OTA). Other long-term liabilities include our initial $219.7 million estimated fair value for the Liquidity Option Agreement (see Note 17).
[3] | From an accounting perspective, Enterprise acquired control of Oiltanking as a result of completing Step 1. 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 of $49.32 per unit on that date.
[4] | The IDRs represented contractual rights to future cash incentive distributions to be paid by Oiltanking. These rights were granted to Oiltanking GP under the terms of Oiltanking's partnership agreement. Oiltanking GP could separate and sell the IDRs independent of its other residual general partner interest in Oiltanking. In February 2015 (following completion of Step 2 of the Oiltanking acquisition), the Oiltanking IDRs were cancelled and the carrying value of this intangible asset was reclassified to goodwill.

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