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Business Segments, Segment Reporting Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Information by business segment [Abstract]          
Revenues from third parties $ 12,319.2 $ 12,085.6 $ 37,697.1 $ 34,605.4  
Revenues from related parties 11.0 7.7 63.8 20.3  
Intersegment and intrasegment revenues 0 0 0 0  
Total revenues 12,330.2 12,093.3 37,760.9 34,625.7  
Equity in income (loss) of unconsolidated affiliates 72.3 44.0 179.1 126.1  
Gross operating margin 1,335.1 1,154.0 3,928.1 3,527.3  
Property, plant and equipment, net (see Note 6) 27,963.3   27,963.3   26,946.6
Investments in unconsolidated affiliates (see Note 7) 2,938.3   2,938.3   2,437.1
Intangible assets, net (see Note 8) 1,391.1   1,391.1   1,462.2
Goodwill (see Note 8) 2,079.9 [1]   2,079.9 [1]   2,080.0 [1]
Segment assets 34,372.6   34,372.6   32,925.9
NGL Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 11.7 4.1 19.2 11.8  
Intangible assets, net (see Note 8) 264.6   264.6   285.2
Goodwill (see Note 8) 861.2   861.2   341.2
Onshore Natural Gas Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 0.9 1.0 2.7 2.9  
Intangible assets, net (see Note 8) 983.6   983.6   1,017.8
Goodwill (see Note 8) 296.3   296.3   296.3
Onshore Crude Oil Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 46.8 34.3 131.7 101.0  
Intangible assets, net (see Note 8) 3.6   3.6   4.5
Goodwill (see Note 8) 305.1   305.1   305.1
Offshore Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 17.1 9.8 35.8 24.9  
Intangible assets, net (see Note 8) 43.9   43.9   54.7
Goodwill (see Note 8) 82.0   82.0   82.1
Petrochemical and Refined Products Services [Member]
          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates (4.2) (5.2) (10.3) (14.5)  
Intangible assets, net (see Note 8) 95.4   95.4   100.0
Goodwill (see Note 8) 535.3   535.3   1,055.3
Reportable Business Segments [Member] | NGL Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 4,024.0 4,230.6 13,217.2 11,686.0  
Revenues from related parties 2.7 0.1 10.2 0.6  
Intersegment and intrasegment revenues 3,603.8 2,542.3 10,789.7 7,631.7  
Total revenues 7,630.5 6,773.0 24,017.1 19,318.3  
Equity in income (loss) of unconsolidated affiliates 11.7 4.1 19.2 11.8  
Gross operating margin 711.5 639.6 2,172.4 1,777.0  
Property, plant and equipment, net (see Note 6) 11,768.9   11,768.9   9,957.8
Investments in unconsolidated affiliates (see Note 7) 685.8   685.8   645.5
Intangible assets, net (see Note 8) 264.6   264.6   285.2
Goodwill (see Note 8) 861.2   861.2   341.2
Segment assets 13,580.5   13,580.5   11,229.7
Reportable Business Segments [Member] | Onshore Natural Gas Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 1,026.5 831.4 3,261.0 2,658.6  
Revenues from related parties 5.4 4.1 16.5 12.1  
Intersegment and intrasegment revenues 231.0 215.6 835.8 726.7  
Total revenues 1,262.9 1,051.1 4,113.3 3,397.4  
Equity in income (loss) of unconsolidated affiliates 0.9 1.0 2.7 2.9  
Gross operating margin 195.4 213.4 618.8 601.9  
Property, plant and equipment, net (see Note 6) 8,834.7   8,834.7   8,917.3
Investments in unconsolidated affiliates (see Note 7) 23.5   23.5   24.2
Intangible assets, net (see Note 8) 983.6   983.6   1,017.8
Goodwill (see Note 8) 296.3   296.3   296.3
Segment assets 10,138.1   10,138.1   10,255.6
Reportable Business Segments [Member] | Onshore Crude Oil Pipelines and Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 5,435.6 5,435.4 16,236.6 15,358.1  
Revenues from related parties 1.5 2.1 31.1 2.1  
Intersegment and intrasegment revenues 2,529.5 3,591.3 10,714.5 8,333.0  
Total revenues 7,966.6 9,028.8 26,982.2 23,693.2  
Equity in income (loss) of unconsolidated affiliates 46.8 34.3 131.7 101.0  
Gross operating margin 190.8 146.0 534.5 579.6  
Property, plant and equipment, net (see Note 6) 1,540.6   1,540.6   1,479.9
Investments in unconsolidated affiliates (see Note 7) 1,651.7   1,651.7   1,165.2
Intangible assets, net (see Note 8) 3.6   3.6   4.5
Goodwill (see Note 8) 305.1   305.1   305.1
Segment assets 3,501.0   3,501.0   2,954.7
Reportable Business Segments [Member] | Offshore Pipelines And Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 41.1 38.2 112.4 118.0  
Revenues from related parties 1.4 1.4 6.0 5.5  
Intersegment and intrasegment revenues 1.2 1.8 4.8 8.0  
Total revenues 43.7 41.4 123.2 131.5  
Equity in income (loss) of unconsolidated affiliates 17.1 9.8 35.8 24.9  
Gross operating margin 47.1 37.9 120.0 118.1  
Property, plant and equipment, net (see Note 6) 1,168.2   1,168.2   1,223.7
Investments in unconsolidated affiliates (see Note 7) 502.4   502.4   531.8
Intangible assets, net (see Note 8) 43.9   43.9   54.7
Goodwill (see Note 8) 82.0   82.0   82.1
Segment assets 1,796.5   1,796.5   1,892.3
Reportable Business Segments [Member] | Petrochemical and Refined Products Services [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 1,792.0 1,550.0 4,869.9 4,784.7  
Revenues from related parties 0 0 0 0  
Intersegment and intrasegment revenues 452.2 384.4 1,317.6 1,200.7  
Total revenues 2,244.2 1,934.4 6,187.5 5,985.4  
Equity in income (loss) of unconsolidated affiliates (4.2) (5.2) (10.3) (14.5)  
Gross operating margin 190.3 117.1 482.4 450.7  
Property, plant and equipment, net (see Note 6) 2,845.2   2,845.2   2,712.4
Investments in unconsolidated affiliates (see Note 7) 74.9   74.9   70.4
Intangible assets, net (see Note 8) 95.4   95.4   100.0
Goodwill (see Note 8) 535.3   535.3   1,055.3
Segment assets 3,550.8   3,550.8   3,938.1
Eliminations [Member]
          
Information by business segment [Abstract]          
Revenues from third parties 0 0 0 0  
Revenues from related parties 0 0 0 0  
Intersegment and intrasegment revenues (6,817.7) (6,735.4) (23,662.4) (17,900.1)  
Total revenues (6,817.7) (6,735.4) (23,662.4) (17,900.1)  
Equity in income (loss) of unconsolidated affiliates 0 0 0 0  
Gross operating margin 0 0 0 0  
Adjustments [Member]
          
Information by business segment [Abstract]          
Property, plant and equipment, net (see Note 6) 1,805.7   1,805.7   2,655.5
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 $ 1,805.7   $ 1,805.7   $ 2,655.5
[1] The total carrying amount of goodwill at September 30, 2014 and December 31, 2013 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the nine months ended September 30, 2014.