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Business Segments, Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Information by business segment [Abstract]          
Revenues from third parties $ 7,085.2 $ 12,503.5 $ 14,551.6 $ 25,377.9  
Revenues from related parties 7.3 17.3 13.4 52.8  
Intersegment and intrasegment revenues 0.0 0.0 0.0 0.0  
Total revenues 7,092.5 12,520.8 14,565.0 25,430.7  
Equity in income (loss) of unconsolidated affiliates 110.2 50.3 199.4 106.8  
Gross operating margin 1,303.2 1,263.2 2,637.6 2,593.0  
Property, plant and equipment, net (see Note 7) 29,783.8   29,783.8   $ 29,881.6
Investments in unconsolidated affiliates (see Note 8) 2,607.2   2,607.2   3,042.0
Intangible assets, net (see Note 9) 2,733.5   2,733.5   4,302.1
Goodwill (see Note 9) 5,664.8   5,664.8   4,292.7
Segment assets 40,789.3   40,789.3   41,518.4
NGL Pipelines and Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 12.5 6.1 24.1 7.5  
Intangible assets, net (see Note 9)         689.2
Goodwill (see Note 9) 2,640.5   2,640.5   2,207.9
Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 79.4 42.2 139.3 84.9  
Intangible assets, net (see Note 9)         2,223.6
Goodwill (see Note 9) 1,765.0   1,765.0   914.3
Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 1.0 0.9 1.9 1.8  
Intangible assets, net (see Note 9)         972.9
Goodwill (see Note 9) 296.3   296.3   296.3
Petrochemical and Refined Products Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates (3.7) (6.5) (7.1) (6.1)  
Intangible assets, net (see Note 9)         374.8
Goodwill (see Note 9) 963.0   963.0   792.2
Offshore Pipelines And Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 21.0 7.6 41.2 18.7  
Intangible assets, net (see Note 9)         41.6
Goodwill (see Note 9) 0.0   0.0   82.0
Reportable Business Segments [Member] | NGL Pipelines and Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 2,263.8 4,019.5 4,938.6 9,193.2  
Revenues from related parties 2.3 1.7 3.8 7.5  
Intersegment and intrasegment revenues 2,781.0 3,324.9 5,224.1 7,185.9  
Total revenues 5,047.1 7,346.1 10,166.5 16,386.6  
Equity in income (loss) of unconsolidated affiliates 12.5 6.1 24.1 7.5  
Gross operating margin 650.6 680.9 1,345.8 1,460.9  
Property, plant and equipment, net (see Note 7) 11,919.2   11,919.2   11,766.9
Investments in unconsolidated affiliates (see Note 8) 683.5   683.5   682.3
Intangible assets, net (see Note 9) 246.6   246.6   689.2
Goodwill (see Note 9) 2,640.5   2,640.5   2,207.9
Segment assets 15,489.8   15,489.8   15,346.3
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 3,087.0 5,865.6 5,764.0 10,801.0  
Revenues from related parties 1.4 6.7 2.4 29.6  
Intersegment and intrasegment revenues 1,539.7 5,634.3 2,816.8 8,185.0  
Total revenues 4,628.1 11,506.6 8,583.2 19,015.6  
Equity in income (loss) of unconsolidated affiliates 79.4 42.2 139.3 84.9  
Gross operating margin 235.6 184.0 449.6 343.7  
Property, plant and equipment, net (see Note 7) 2,484.3   2,484.3   2,332.2
Investments in unconsolidated affiliates (see Note 8) 1,818.3   1,818.3   1,767.7
Intangible assets, net (see Note 9) 1,334.9   1,334.9   2,223.6
Goodwill (see Note 9) 1,765.0   1,765.0   914.3
Segment assets 7,402.5   7,402.5   7,237.8
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 681.4 1,034.5 1,412.3 2,234.5  
Revenues from related parties 3.3 6.5 6.3 11.1  
Intersegment and intrasegment revenues 169.5 295.4 339.5 604.8  
Total revenues 854.2 1,336.4 1,758.1 2,850.4  
Equity in income (loss) of unconsolidated affiliates 1.0 0.9 1.9 1.8  
Gross operating margin 191.4 203.0 395.9 423.4  
Property, plant and equipment, net (see Note 7) 8,741.0   8,741.0   8,835.5
Investments in unconsolidated affiliates (see Note 8) 31.1   31.1   23.2
Intangible assets, net (see Note 9) 953.1   953.1   972.9
Goodwill (see Note 9) 296.3   296.3   296.3
Segment assets 10,021.5   10,021.5   10,127.9
Reportable Business Segments [Member] | Petrochemical and Refined Products Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 1,018.5 1,547.3 2,367.6 3,077.9  
Revenues from related parties 0.0 0.0 0.0 0.0  
Intersegment and intrasegment revenues 322.9 428.4 608.5 865.4  
Total revenues 1,341.4 1,975.7 2,976.1 3,943.3  
Equity in income (loss) of unconsolidated affiliates (3.7) (6.5) (7.1) (6.1)  
Gross operating margin 181.3 161.7 355.9 292.1  
Property, plant and equipment, net (see Note 7) 3,057.9   3,057.9   3,047.2
Investments in unconsolidated affiliates (see Note 8) 74.3   74.3   75.1
Intangible assets, net (see Note 9) 198.9   198.9   374.8
Goodwill (see Note 9) 963.0   963.0   792.2
Segment assets 4,294.1   4,294.1   4,289.3
Reportable Business Segments [Member] | Offshore Pipelines And Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 34.5 36.6 69.1 71.3  
Revenues from related parties 0.3 2.4 0.9 4.6  
Intersegment and intrasegment revenues 0.1 1.3 0.5 3.6  
Total revenues 34.9 40.3 70.5 79.5  
Equity in income (loss) of unconsolidated affiliates 21.0 7.6 41.2 18.7  
Gross operating margin 44.3 33.6 90.4 72.9  
Property, plant and equipment, net (see Note 7) 0.0   0.0   1,145.1
Investments in unconsolidated affiliates (see Note 8) 0.0   0.0   493.7
Intangible assets, net (see Note 9) 0.0   0.0   41.6
Goodwill (see Note 9) 0.0   0.0   82.0
Segment assets 0.0   0.0   1,762.4
Eliminations [Member]          
Information by business segment [Abstract]          
Revenues from third parties 0.0 0.0 0.0 0.0  
Revenues from related parties 0.0 0.0 0.0 0.0  
Intersegment and intrasegment revenues (4,813.2) (9,684.3) (8,989.4) (16,844.7)  
Total revenues (4,813.2) (9,684.3) (8,989.4) (16,844.7)  
Equity in income (loss) of unconsolidated affiliates 0.0 0.0 0.0 0.0  
Gross operating margin 0.0 $ 0.0 0.0 $ 0.0  
Adjustments [Member]          
Information by business segment [Abstract]          
Property, plant and equipment, net (see Note 7) 3,581.4   3,581.4   2,754.7
Investments in unconsolidated affiliates (see Note 8) 0.0   0.0   0.0
Intangible assets, net (see Note 9) 0.0   0.0   0.0
Goodwill (see Note 9) 0.0   0.0   0.0
Segment assets $ 3,581.4   $ 3,581.4   $ 2,754.7