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Intangible Assets and Goodwill, Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Changes in carrying amount of goodwill [Roll Forward]    
Balance at beginning of period $ 2,080.0 [1]  
Goodwill related to the sale of assets (0.1)  
Reclassification of goodwill 0  
Balance at end of period 2,079.9 [1]  
Accumulated impairment charges 1.3 1.3
Fixed assets transferred 73.7  
NGL Pipelines & Services [Member]
    
Changes in carrying amount of goodwill [Roll Forward]    
Balance at beginning of period 341.2 [1]  
Goodwill related to the sale of assets 0  
Reclassification of goodwill 520.0  
Balance at end of period 861.2 [1]  
Onshore Natural Gas Pipelines & Services [Member]
    
Changes in carrying amount of goodwill [Roll Forward]    
Balance at beginning of period 296.3 [1]  
Goodwill related to the sale of assets 0  
Reclassification of goodwill 0  
Balance at end of period 296.3 [1]  
Onshore Crude Oil Pipelines & Services [Member]
    
Changes in carrying amount of goodwill [Roll Forward]    
Balance at beginning of period 305.1 [1]  
Goodwill related to the sale of assets 0  
Reclassification of goodwill 0  
Balance at end of period 305.1 [1]  
Offshore Pipelines & Services [Member]
    
Changes in carrying amount of goodwill [Roll Forward]    
Balance at beginning of period 82.1 [1]  
Goodwill related to the sale of assets (0.1)  
Reclassification of goodwill 0  
Balance at end of period 82.0 [1]  
Petrochemical & Refined Products Services [Member]
    
Changes in carrying amount of goodwill [Roll Forward]    
Balance at beginning of period 1,055.3 [1]  
Goodwill related to the sale of assets 0  
Reclassification of goodwill (520.0)  
Balance at end of period $ 535.3 [1]  
[1] The total carrying amount of goodwill at June 30, 2014 and December 31, 2013 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the six months ended June 30, 2014.