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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%