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Commitments and Contingencies, Liquidity Option Agreement (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 02, 2014
Liquidity Option Agreement [Abstract] |  |  |  |
Purchase price adjustment to goodwill | $ 1,454.1 |  |  |
Change in fair value of Liquidity Option Agreement | $ 25.4 | $ 0.0 | $ 0.0 |
Liquidity Option Agreement [Member] |  |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Other Commitments, Description | In connection with Step 1 of the Oiltanking acquisition, we entered into the Liquidity Option Agreement (“Liquidity Option”) with OTA and M&B, whereby we granted M&B the option to sell to us 100% of the issued and outstanding capital stock of OTA at any time within a 90-day period commencing on February 1, 2020. The aggregate consideration to be paid by us for OTA’s capital stock would equal 100% of the then-current fair market value of the Enterprise common units owned by OTA at the exercise date. If a Trigger Event occurs (as defined in the underlying agreements), the Liquidity Option may be exercised earlier within a 135-day period following notice of such event. |  |  |
Level 3 [Member] | Liquidity Option Agreement [Member] |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |
Fair value inputs, assumed long-term debt | $ 2,200.0 |  |  |
Fair value inputs, Interest rate on assumed debt of OTA following option exercise | 6.4% over 30 years |  |  |
Fair value inputs, federal and state tax rate (in hundredths) | 38.00% |  |  |
Cash flow projections discount rate (in hundredths) | 7.50% |  |  |
Fair value inputs, weighted-average expected ownership percentage of contributed units at beginning of option period (in hundredths) | 0.789 |  |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Liquidity Option Agreement | $ 245.1 | $ 219.7 |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Minimum [Member] |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |
Fair value inputs, Expected life of OTA following option exercise (in years) | 1 |  |  |
Fair value inputs, Estimated growth rates in Enterprise earnings before interest, taxes, depreciation and amortization (in hundredths) | 2.00% |  |  |
Fair value inputs, OTA ownership interest in Enterprise common units (in hundredths) | 1.90% |  |  |
Fair value inputs, Forecasted yield on Enterprise common units (in hundredths) | 5.80% |  |  |
Level 3 [Member] | Liquidity Option Agreement [Member] | Maximum [Member] |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |
Fair value inputs, Expected life of OTA following option exercise (in years) | 30 |  |  |
Fair value inputs, Estimated growth rates in Enterprise earnings before interest, taxes, depreciation and amortization (in hundredths) | 15.00% |  |  |
Fair value inputs, OTA ownership interest in Enterprise common units (in hundredths) | 2.70% |  |  |
Fair value inputs, Forecasted yield on Enterprise common units (in hundredths) | 6.60% |  |  |
Oiltanking Partners L.P. - Step 1 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common units issued in connection with acquisition (in units) |  | 54,807,352 |  |
Liquidity Option Agreement [Abstract] |  |  |  |
Liquidity Option Agreement |  |  |  | $ 219.7
Liquidity Option Agreement valuation adjustment |  | $ 100.3 |  |
Purchase price adjustment to goodwill |  | $ 100.3 |  |

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