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Commitments and Contingencies, Liquidity Option Agreement (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |  |
Number of units held by limited partner (in units) | 54,807,352 |  |  | 54,807,352 |  |
Liquidity Option Agreement [Abstract] |  |  |  |  |  |
Liquidity Option Agreement | $ 266.2 |  |  | $ 266.2 |  | $ 245.1
Change in fair value of Liquidity Option Agreement | $ 23.3 | $ (2.2) | $ 11.5 | 21.1 | $ 11.5 |
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 (in hundredths) |  | 5.20% |  | 4.55% |  |
Fair value inputs, Life of debt assumed after Liquidity option is exercised |  |  |  | 30 years |  |
Fair value inputs, federal and state tax rate (in hundredths) |  |  |  | 38.00% |  |
Cash flow projections discount rate (in hundredths) |  | 7.80% |  | 7.60% |  |
Fair value inputs, weighted-average expected ownership percentage of contributed units at beginning of option period (in hundredths) |  |  |  | 0.815 |  |
Liquidity Option Agreement [Abstract] |  |  |  |  |  |
Other Commitments, Description |  |  |  | We entered into a put option agreement (the “Liquidity Option Agreement”) with OTA and Marquard & Bahls (“M&B”) in connection with the Oiltanking acquisition. Under the Liquidity Option Agreement, 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. |  |
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 years |  |
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% |  |
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 year |  |
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% |  |

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