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Business Segments, Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Information by business segment [Abstract]          
Revenues from third parties $ 6,294.0 $ 12,319.2 $ 20,845.6 $ 37,697.1  
Revenues from related parties 13.9 11.0 27.3 63.8  
Intersegment and intrasegment revenues 0.0 0.0 0.0 0.0  
Total revenues 6,307.9 12,330.2 20,872.9 37,760.9  
Equity in income (loss) of unconsolidated affiliates 103.1 72.3 302.5 179.1  
Gross operating margin 1,341.1 1,335.1 3,978.7 3,928.1  
Property, plant and equipment, net (see Note 6) 31,214.1   31,214.1   $ 29,881.6
Investments in unconsolidated affiliates (see Note 7) 2,625.3   2,625.3   3,042.0
Intangible assets, net (see Note 9) 4,082.1   4,082.1   4,302.1
Goodwill (see Note 9) 5,749.2   5,749.2   4,300.2
Segment assets 43,670.7   43,670.7   41,525.9
NGL Pipelines and Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 18.9 11.7 43.0 19.2  
Intangible assets, net (see Note 9) 460.4   460.4   689.2
Goodwill (see Note 9) 2,651.7   2,651.7   2,210.2
Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 81.2 46.8 220.5 131.7  
Intangible assets, net (see Note 9) 2,402.3   2,402.3   2,223.6
Goodwill (see Note 9) 1,842.8   1,842.8   918.7
Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 0.9 0.9 2.8 2.7  
Intangible assets, net (see Note 9) 1,025.7   1,025.7   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 (3.3) (4.2) (10.4) (10.3)  
Intangible assets, net (see Note 9) 193.7   193.7   374.8
Goodwill (see Note 9) 958.4   958.4   793.0
Offshore Pipelines And Services [Member]          
Information by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 5.4 17.1 46.6 35.8  
Intangible assets, net (see Note 9) [1] 0.0   0.0   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 2,284.6 4,024.0 7,223.2 13,217.2  
Revenues from related parties 2.2 2.7 6.0 10.2  
Intersegment and intrasegment revenues 2,461.0 3,603.8 7,685.1 10,789.7  
Total revenues 4,747.8 7,630.5 14,914.3 24,017.1  
Equity in income (loss) of unconsolidated affiliates 18.9 11.7 43.0 19.2  
Gross operating margin 695.5 711.5 2,041.3 2,172.4  
Property, plant and equipment, net (see Note 6) 12,192.8   12,192.8   11,766.9
Investments in unconsolidated affiliates (see Note 7) 708.9   708.9   682.3
Intangible assets, net (see Note 9) 460.4   460.4   689.2
Goodwill (see Note 9) 2,651.7   2,651.7   2,210.2
Segment assets 16,013.8   16,013.8   15,348.6
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 2,316.4 5,435.6 8,080.4 16,236.6  
Revenues from related parties 6.2 1.5 8.6 31.1  
Intersegment and intrasegment revenues 1,142.1 2,529.5 3,958.9 10,714.5  
Total revenues 3,464.7 7,966.6 12,047.9 26,982.2  
Equity in income (loss) of unconsolidated affiliates 81.2 46.8 220.5 131.7  
Gross operating margin 254.6 190.8 704.2 534.5  
Property, plant and equipment, net (see Note 6) 3,550.0   3,550.0   2,332.2
Investments in unconsolidated affiliates (see Note 7) 1,817.9   1,817.9   1,767.7
Intangible assets, net (see Note 9) 2,402.3   2,402.3   2,223.6
Goodwill (see Note 9) 1,842.8   1,842.8   918.7
Segment assets 9,613.0   9,613.0   7,242.2
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 705.2 1,026.5 2,117.5 3,261.0  
Revenues from related parties 4.5 5.4 10.8 16.5  
Intersegment and intrasegment revenues 180.2 231.0 519.7 835.8  
Total revenues 889.9 1,262.9 2,648.0 4,113.3  
Equity in income (loss) of unconsolidated affiliates 0.9 0.9 2.8 2.7  
Gross operating margin 192.4 195.4 588.3 618.8  
Property, plant and equipment, net (see Note 6) 8,680.6   8,680.6   8,835.5
Investments in unconsolidated affiliates (see Note 7) 23.1   23.1   23.2
Intangible assets, net (see Note 9) 1,025.7   1,025.7   972.9
Goodwill (see Note 9) 296.3   296.3   296.3
Segment assets 10,025.7   10,025.7   10,127.9
Reportable Business Segments [Member] | Petrochemical and Refined Products Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 980.0 1,792.0 3,347.6 4,869.9  
Revenues from related parties 0.0 0.0 0.0 0.0  
Intersegment and intrasegment revenues 267.3 452.2 875.8 1,317.6  
Total revenues 1,247.3 2,244.2 4,223.4 6,187.5  
Equity in income (loss) of unconsolidated affiliates (3.3) (4.2) (10.4) (10.3)  
Gross operating margin 191.5 190.3 547.4 482.4  
Property, plant and equipment, net (see Note 6) 3,013.5   3,013.5   3,047.2
Investments in unconsolidated affiliates (see Note 7) 75.4   75.4   75.1
Intangible assets, net (see Note 9) 193.7   193.7   374.8
Goodwill (see Note 9) 958.4   958.4   793.0
Segment assets 4,241.0   4,241.0   4,290.1
Reportable Business Segments [Member] | Offshore Pipelines And Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 7.8 41.1 76.9 112.4  
Revenues from related parties 1.0 1.4 1.9 6.0  
Intersegment and intrasegment revenues 0.1 1.2 0.6 4.8  
Total revenues 8.9 43.7 79.4 123.2  
Equity in income (loss) of unconsolidated affiliates 5.4 17.1 46.6 35.8  
Gross operating margin 7.1 47.1 97.5 120.0  
Property, plant and equipment, net (see Note 6) 0.0   0.0   1,145.1
Investments in unconsolidated affiliates (see Note 7) 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 (4,050.7) (6,817.7) (13,040.1) (23,662.4)  
Total revenues (4,050.7) (6,817.7) (13,040.1) (23,662.4)  
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 6) 3,777.2   3,777.2   2,754.7
Investments in unconsolidated affiliates (see Note 7) 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 $ 3,777.2   $ 3,777.2   $ 2,754.7
[1] Our intangible assets classified within the Offshore Pipelines & Services segment were sold to Genesis in July 2015 (see Note 6).