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Business Combinations (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 14 Months Ended
Feb. 28, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 13, 2015
Description of Business Combinations:              
Cash paid to acquire business       $ 1,056.5 $ 2,416.8 $ 0.0  
Intangible assets reclassified to goodwill       1,454.1      
EFS Midstream Contract with Producers [Member]              
Description of Business Combinations:              
Contractual obligation     $ 270.0 $ 270.0      
Contract term (in years)       10 years      
Eagle Ford Midstream Assets [Member]              
Description of Business Combinations:              
Business Acquisition, Description       The EFS Midstream System includes approximately 460 miles of gathering pipelines, ten central gathering plants, 119 thousand barrels per day of condensate stabilization capacity and 780 million cubic feet per day of associated natural gas treating capacity.      
Total consideration for acquisition       $ 2,056.5      
Revenues from acquired assets     117.8        
Net income from acquired assets     $ 59.9        
Oiltanking Partners L.P. [Member]              
Description of Business Combinations:              
Business Acquisition, Description       Oiltanking owned marine terminals located on the Houston Ship Channel and at the Port of Beaumont with a total of 12 ship and barge docks and approximately 26 MMBbls of crude oil and petroleum products storage capacity. Oiltanking’s marine terminal on the Houston Ship Channel is connected by pipeline to our Mont Belvieu, Texas complex and is integral to our growing LPG export, crude oil storage and octane enhancement and propylene businesses. Our ECHO facility is also connected to Oiltanking’s system.      
Total consideration for acquisition         $ 4,400.0   $ 6,020.0
Number of common units issued for each subordinated unit converted (in units)         1    
Noncontrolling interests acquired       $ 1,400.0      
Number of units owned upon conversion (in units)         54,799,604    
Limited partner interests acquired (in hundredths)   65.90%     65.90%    
Intangible assets reclassified to goodwill       $ 1,454.1      
Revenues from acquired assets   $ 57.5          
Net income from acquired assets   $ 8.1          
Oiltanking Partners L.P. - Step 1 [Member]              
Description of Business Combinations:              
Common units acquired (in units)         15,899,802    
Subordinated units acquired (in units)         38,899,802    
Total consideration for acquisition         $ 4,609.8    
Cash paid to acquire business         $ 2,210.0    
Common units issued in connection with acquisition (in units)         54,807,352    
Intangible assets reclassified to goodwill         $ 100.3    
Cash paid to assume notes receivable         $ 228.3    
Taxable income, goodwill amortization period (in years)         15 years    
Acquisition related costs         $ 3.8    
Oiltanking Partners L.P. - Step 2 [Member]              
Description of Business Combinations:              
Common units issued in connection with acquisition (in units) 36,827,517            
Common units exchanged for each Oiltanking unit (in units) 1.3            
Intangible assets reclassified to goodwill $ 1,460.0