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Intangible Assets and Goodwill (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Identifiable intangible assets [Abstract]          
Gross Value $ 2,723.1   $ 2,723.1   $ 2,774.0
Accum. Amort. (966.5)   (966.5)   (932.3)
Carrying Value 1,756.6   1,756.6   1,841.7
Amortization Expense 37.4 34.1 75.1 63.7  
Forecasted amortization expense [Abstract]          
Remainder of 2011     69.7    
2012     132.4    
2013     127.1    
2014     127.2    
2015     125.8    
Changes in carrying amount of goodwill [Roll Forward]          
Balance at December 31, 2010     2,107.7    
Goodwill adjustment     (0.6)    
Balance at June 30, 2011 2,107.1   2,107.1    
Accumulated impairment charges 1.3   1.3   1.3
NGL Pipelines and Services [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 628.3   628.3   663.0
Accum. Amort. (279.0)   (279.0)   (283.3)
Carrying Value 349.3   349.3   379.7
Amortization Expense 10.0 10.1 20.4 19.4  
Changes in carrying amount of goodwill [Roll Forward]          
Balance at December 31, 2010     341.2 [1]    
Goodwill adjustment     0 [2]    
Balance at June 30, 2011 341.2 [1]   341.2 [1]    
NGL Pipelines and Services [Member] | Customer relationship intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 340.8   340.8   340.8
Accum. Amort. (117.6)   (117.6)   (106.7)
Carrying Value 223.2   223.2   234.1
NGL Pipelines and Services [Member] | Contract-based intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 287.5   287.5   322.2
Accum. Amort. (161.4)   (161.4)   (176.6)
Carrying Value 126.1   126.1   145.6
Onshore Natural Gas Pipelines And Services [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 1,715.1   1,715.1   1,728.9
Accum. Amort. (509.1)   (509.1)   (482.8)
Carrying Value 1,206.0   1,206.0   1,246.1
Amortization Expense 20.2 18.1 40.1 32.3  
Changes in carrying amount of goodwill [Roll Forward]          
Balance at December 31, 2010     311.1 [1]    
Goodwill adjustment     0 [2]    
Balance at June 30, 2011 311.1 [1]   311.1 [1]    
Onshore Natural Gas Pipelines And Services [Member] | Customer relationship intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 1,163.6   1,163.6   1,163.6
Accum. Amort. (185.5)   (185.5)   (160.8)
Carrying Value 978.1   978.1   1,002.8
Onshore Natural Gas Pipelines And Services [Member] | Contract-based intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 551.5   551.5   565.3
Accum. Amort. (323.6)   (323.6)   (322.0)
Carrying Value 227.9   227.9   243.3
Onshore Crude Oil Pipelines and Services [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 10.1   10.1   10.1
Accum. Amort. (4.1)   (4.1)   (3.9)
Carrying Value 6.0   6.0   6.2
Amortization Expense 0.1 0.1 0.2 0.2  
Changes in carrying amount of goodwill [Roll Forward]          
Balance at December 31, 2010     311.2 [1]    
Goodwill adjustment     0 [2]    
Balance at June 30, 2011 311.2 [1]   311.2 [1]    
Onshore Crude Oil Pipelines and Services [Member] | Customer relationship intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 9.7   9.7   9.7
Accum. Amort. (3.9)   (3.9)   (3.7)
Carrying Value 5.8   5.8   6.0
Onshore Crude Oil Pipelines and Services [Member] | Contract-based intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 0.4   0.4   0.4
Accum. Amort. (0.2)   (0.2)   (0.2)
Carrying Value 0.2   0.2   0.2
Offshore Pipelines And Services [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 207.0   207.0   207.0
Accum. Amort. (124.1)   (124.1)   (118.3)
Carrying Value 82.9   82.9   88.7
Amortization Expense 2.8 3.2 5.8 6.6  
Changes in carrying amount of goodwill [Roll Forward]          
Balance at December 31, 2010     82.1 [1]    
Goodwill adjustment     0 [2]    
Balance at June 30, 2011 82.1 [1]   82.1 [1]    
Offshore Pipelines And Services [Member] | Customer relationship intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 205.8   205.8   205.8
Accum. Amort. (123.8)   (123.8)   (118.1)
Carrying Value 82.0   82.0   87.7
Offshore Pipelines And Services [Member] | Contract-based intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 1.2   1.2   1.2
Accum. Amort. (0.3)   (0.3)   (0.2)
Carrying Value 0.9   0.9   1.0
Petrochemical and Refined Products Services [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 162.6   162.6   165.0
Accum. Amort. (50.2)   (50.2)   (44.0)
Carrying Value 112.4   112.4   121.0
Amortization Expense 4.3 2.6 8.6 5.2  
Changes in carrying amount of goodwill [Roll Forward]          
Balance at December 31, 2010     1,062.1 [1]    
Goodwill adjustment     (0.6) [2]    
Balance at June 30, 2011 1,061.5 [1]   1,061.5 [1]    
Petrochemical and Refined Products Services [Member] | Customer relationship intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 104.8   104.8   104.7
Accum. Amort. (26.5)   (26.5)   (23.8)
Carrying Value 78.3   78.3   80.9
Petrochemical and Refined Products Services [Member] | Contract-based intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Gross Value 57.8   57.8   60.3
Accum. Amort. (23.7)   (23.7)   (20.2)
Carrying Value 34.1   34.1   40.1
Customer relationship intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Carrying Value 1,370.0   1,370.0    
Contract-based intangibles [Member]
         
Identifiable intangible assets [Abstract]          
Carrying Value $ 389.2   $ 389.2    
[1] The total carrying amount of goodwill at June 30, 2011 and December 31, 2010 is presented net of $1.3 million of accumulated impairment charges.
[2] Purchase price adjustment related to a marine business combination completed in November 2010.