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Business Segments, Segment Reporting Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Information by business segment [Abstract]          
Revenues from third parties $ 11,142.6 $ 9,764.2 $ 22,519.8 $ 20,985.9  
Revenues from related parties 6.7 25.6 12.6 56.4  
Revenues 11,149.3 9,789.8 22,532.4 21,042.3  
Equity in income (loss) of unconsolidated affiliates 37.6 11.3 82.1 21.2  
Gross operating margin 1,142.2 1,033.0 2,373.3 2,085.7  
Property, plant and equipment, net (see Note 6) 25,566.1   25,566.1   24,846.4
Investments in unconsolidated affiliates (see Note 7) 1,938.8   1,938.8   1,394.6
Intangible assets, net: (see Note 8) 1,513.2   1,513.2   1,566.8
Goodwill: (see Note 8) 2,080.0 [1]   2,080.0 [1]   2,086.8 [1]
Segment assets 31,098.1   31,098.1   29,894.6
NGL Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 3,504.7 3,327.9 7,455.4 7,682.0  
Revenues from related parties 0.2 4.6 0.5 5.0  
Revenues 3,504.9 3,332.5 7,455.9 7,687.0  
Equity in income (loss) of unconsolidated affiliates 3.8 3.8 7.7 9.0  
Gross operating margin 544.9 565.8 1,137.4 1,220.7  
Property, plant and equipment, net (see Note 6) 9,195.8   9,195.8   8,494.8
Investments in unconsolidated affiliates (see Note 7) 515.5   515.5   324.6
Intangible assets, net: (see Note 8) 301.5   301.5   320.6
Goodwill: (see Note 8) 341.2 [1]   341.2 [1]   341.2 [1]
Segment assets 10,354.0   10,354.0   9,481.2
Onshore Natural Gas Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 953.0 700.9 1,827.2 1,505.8  
Revenues from related parties 4.5 19.5 8.0 48.2  
Revenues 957.5 720.4 1,835.2 1,554.0  
Equity in income (loss) of unconsolidated affiliates 0.9 1.2 1.9 2.6  
Gross operating margin 197.7 175.8 388.5 382.0  
Property, plant and equipment, net (see Note 6) 8,925.8   8,925.8   8,950.1
Investments in unconsolidated affiliates (see Note 7) 24.4   24.4   24.9
Intangible assets, net: (see Note 8) 1,043.2   1,043.2   1,067.9
Goodwill: (see Note 8) 296.3 [1]   296.3 [1]   296.3 [1]
Segment assets 10,289.7   10,289.7   10,339.2
Onshore Crude Oil Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 5,129.5 4,188.7 9,922.7 8,662.3  
Revenues from related parties 0 0 0 0  
Revenues 5,129.5 4,188.7 9,922.7 8,662.3  
Equity in income (loss) of unconsolidated affiliates 30.1 3.6 66.7 4.1  
Gross operating margin 197.2 95.8 433.6 135.1  
Property, plant and equipment, net (see Note 6) 1,426.2   1,426.2   1,385.9
Investments in unconsolidated affiliates (see Note 7) 783.1   783.1   493.8
Intangible assets, net: (see Note 8) 5.2   5.2   5.9
Goodwill: (see Note 8) 305.1 [1]   305.1 [1]   311.2 [1]
Segment assets 2,519.6   2,519.6   2,196.8
Offshore Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 39.3 47.5 79.8 101.9  
Revenues from related parties 2.0 1.5 4.1 3.2  
Revenues 41.3 49.0 83.9 105.1  
Equity in income (loss) of unconsolidated affiliates 8.7 4.1 15.1 11.0  
Gross operating margin 39.7 38.3 80.2 90.4  
Property, plant and equipment, net (see Note 6) 1,277.6   1,277.6   1,343.0
Investments in unconsolidated affiliates (see Note 7) 543.3   543.3   479.0
Intangible assets, net: (see Note 8) 60.2   60.2   66.2
Goodwill: (see Note 8) 82.1 [1]   82.1 [1]   82.1 [1]
Segment assets 1,963.2   1,963.2   1,970.3
Petrochemical and Refined Products Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 1,516.1 1,499.2 3,234.7 3,033.9  
Revenues from related parties 0 0 0 0  
Revenues 1,516.1 1,499.2 3,234.7 3,033.9  
Equity in income (loss) of unconsolidated affiliates (5.9) (1.4) (9.3) (7.9)  
Gross operating margin 162.7 157.3 333.6 255.1  
Property, plant and equipment, net (see Note 6) 2,636.0   2,636.0   2,559.5
Investments in unconsolidated affiliates (see Note 7) 72.5   72.5   72.3
Intangible assets, net: (see Note 8) 103.1   103.1   106.2
Goodwill: (see Note 8) 1,055.3 [1]   1,055.3 [1]   1,056.0 [1]
Segment assets 3,866.9   3,866.9   3,794.0
Other Investment [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 0 0 0 0  
Revenues from related parties 0 0 0 0  
Equity in income (loss) of unconsolidated affiliates 0 0 0 2.4  
Gross operating margin 0 0 0 2.4  
Property, plant and equipment, net (see Note 6) 0   0   0
Investments in unconsolidated affiliates (see Note 7) 0   0   0
Intangible assets, net: (see Note 8) 0   0   0
Goodwill: (see Note 8) 0   0   0
Segment assets 0   0   0
Adjustments and Eliminations [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 0 0 0 0  
Revenues from related parties 0 0 0 0  
Equity in income (loss) of unconsolidated affiliates 0 0 0 0  
Gross operating margin 0 0 0 0  
Property, plant and equipment, net (see Note 6) 2,104.7   2,104.7   2,113.1
Investments in unconsolidated affiliates (see Note 7) 0   0   0
Intangible assets, net: (see Note 8) 0   0   0
Goodwill: (see Note 8) 0   0   0
Segment assets 2,104.7   2,104.7   2,113.1
Operating Segments [Member]
          
Information by business segment [Abstract]          
Revenues 11,149.3 9,789.8 22,532.4 21,042.3  
Operating Segments [Member] | NGL Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues 5,885.3 5,609.0 12,545.3 12,781.7  
Operating Segments [Member] | Onshore Natural Gas Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Revenues 1,212.4 899.4 2,346.3 1,956.7  
Operating Segments [Member] | Onshore Crude Oil Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues 7,846.5 5,924.2 14,664.4 12,128.7  
Operating Segments [Member] | Offshore Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Revenues 45.5 50.7 90.1 110.1  
Operating Segments [Member] | Petrochemical and Refined Products Services [Member]
          
Information by business segment [Abstract]          
Revenues 1,910.3 1,937.9 4,051.0 3,912.5  
Operating Segments [Member] | Other Investment [Member]
          
Information by business segment [Abstract]          
Revenues 0 0 0 0  
Operating Segments [Member] | Adjustments and Eliminations [Member]
          
Information by business segment [Abstract]          
Revenues (5,750.7) (4,631.4) (11,164.7) (9,847.4)  
Intersegment Eliminations [Member]
          
Information by business segment [Abstract]          
Revenues 0 0 0 0  
Intersegment Eliminations [Member] | NGL Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues (2,380.4) (2,276.5) (5,089.4) (5,094.7)  
Intersegment Eliminations [Member] | Onshore Natural Gas Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Revenues (254.9) (179.0) (511.1) (402.7)  
Intersegment Eliminations [Member] | Onshore Crude Oil Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues (2,717.0) (1,735.5) (4,741.7) (3,466.4)  
Intersegment Eliminations [Member] | Offshore Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Revenues (4.2) (1.7) (6.2) (5.0)  
Intersegment Eliminations [Member] | Petrochemical and Refined Products Services [Member]
          
Information by business segment [Abstract]          
Revenues (394.2) (438.7) (816.3) (878.6)  
Intersegment Eliminations [Member] | Other Investment [Member]
          
Information by business segment [Abstract]          
Revenues 0 0 0 0  
Intersegment Eliminations [Member] | Adjustments and Eliminations [Member]
          
Information by business segment [Abstract]          
Revenues $ (5,750.7) $ (4,631.4) $ (11,164.7) $ (9,847.4)  
[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.