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Intangible Assets and Goodwill, Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Changes in carrying amount of goodwill [Roll Forward]  
Balance at beginning of period $ 2,086.8 [1]
Goodwill related to the sale of assets (6.8)
Balance at end of period 2,080.0 [1]
Accumulated impairment charges 1.3
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
Balance at end of period 341.2 [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
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 311.2 [1]
Goodwill related to the sale of assets (6.1)
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
Balance at end of period 82.1 [1]
Petrochemical & Refined Products Services [Member]
  
Changes in carrying amount of goodwill [Roll Forward]  
Balance at beginning of period 1,056.0 [1]
Goodwill related to the sale of assets (0.7)
Balance at end of period $ 1,055.3 [1]
[1] The total carrying amount of goodwill at June 30, 2013 and December 31, 2012 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the six months ended June 30, 2013.