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Business Segments, Segment Reporting Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | $ 11,377.2 |  | $ 11,221.7 |  |
Revenues from related parties | 5.9 |  | 30.8 |  |
Intersegment and intrasegment revenues | 0 |  | 0 |  |
Total revenues | 11,383.1 |  | 11,252.5 |  |
Equity in income (loss) of unconsolidated affiliates | 44.5 |  | 9.9 |  |
Gross operating margin | 1,231.1 |  | 1,052.7 |  |
Property, plant and equipment, net (see Note 6) | 25,222.5 |  |  | 24,846.4 |
Investments in unconsolidated affiliates (see Note 7) | 1,679.0 |  |  | 1,394.6 |
Intangible assets, net: (see Note 8) | 1,539.8 |  |  | 1,566.8 |
Goodwill: (see Note 8) | 2,086.1 | [1] |  | 2,086.8 | [1]
Segment assets | 30,527.4 |  |  | 29,894.6 |
NGL Pipelines and Services [Member] |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | 3,950.7 |  | 4,354.1 |  |
Revenues from related parties | 0.3 |  | 0.4 |  |
Intersegment and intrasegment revenues | 2,709.0 |  | 2,818.2 |  |
Total revenues | 6,660.0 |  | 7,172.7 |  |
Equity in income (loss) of unconsolidated affiliates | 3.9 |  | 5.2 |  |
Gross operating margin | 592.5 |  | 654.9 |  |
Property, plant and equipment, net (see Note 6) | 9,059.1 |  |  | 8,494.8 |
Investments in unconsolidated affiliates (see Note 7) | 412.1 |  |  | 324.6 |
Intangible assets, net: (see Note 8) | 311.0 |  |  | 320.6 |
Goodwill: (see Note 8) | 341.2 |  |  | 341.2 |
Segment assets | 10,123.4 |  |  | 9,481.2 |
Onshore Natural Gas Pipelines And Services [Member] |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | 874.2 |  | 804.9 |  |
Revenues from related parties | 3.5 |  | 28.7 |  |
Intersegment and intrasegment revenues | 256.2 |  | 223.7 |  |
Total revenues | 1,133.9 |  | 1,057.3 |  |
Equity in income (loss) of unconsolidated affiliates | 1.0 |  | 1.4 |  |
Gross operating margin | 190.8 |  | 206.2 |  |
Property, plant and equipment, net (see Note 6) | 8,942.0 |  |  | 8,950.1 |
Investments in unconsolidated affiliates (see Note 7) | 24.6 |  |  | 24.9 |
Intangible assets, net: (see Note 8) | 1,055.5 |  |  | 1,067.9 |
Goodwill: (see Note 8) | 296.3 |  |  | 296.3 |
Segment assets | 10,318.4 |  |  | 10,339.2 |
Onshore Crude Oil Pipelines and Services [Member] |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | 4,793.2 |  | 4,473.6 |  |
Revenues from related parties | 0 |  | 0 |  |
Intersegment and intrasegment revenues | 2,024.7 |  | 1,730.9 |  |
Total revenues | 6,817.9 |  | 6,204.5 |  |
Equity in income (loss) of unconsolidated affiliates | 36.6 |  | 0.5 |  |
Gross operating margin | 236.4 |  | 39.3 |  |
Property, plant and equipment, net (see Note 6) | 1,359.0 |  |  | 1,385.9 |
Investments in unconsolidated affiliates (see Note 7) | 660.3 |  |  | 493.8 |
Intangible assets, net: (see Note 8) | 5.6 |  |  | 5.9 |
Goodwill: (see Note 8) | 311.2 |  |  | 311.2 |
Segment assets | 2,336.1 |  |  | 2,196.8 |
Offshore Pipelines And Services [Member] |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | 40.5 |  | 54.4 |  |
Revenues from related parties | 2.1 |  | 1.7 |  |
Intersegment and intrasegment revenues | 2.0 |  | 3.3 |  |
Total revenues | 44.6 |  | 59.4 |  |
Equity in income (loss) of unconsolidated affiliates | 6.4 |  | 6.9 |  |
Gross operating margin | 40.5 |  | 52.1 |  |
Property, plant and equipment, net (see Note 6) | 1,323.5 |  |  | 1,343.0 |
Investments in unconsolidated affiliates (see Note 7) | 509.0 |  |  | 479.0 |
Intangible assets, net: (see Note 8) | 63.1 |  |  | 66.2 |
Goodwill: (see Note 8) | 82.1 |  |  | 82.1 |
Segment assets | 1,977.7 |  |  | 1,970.3 |
Petrochemical and Refined Products Services [Member] |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | 1,718.6 |  | 1,534.7 |  |
Revenues from related parties | 0 |  | 0 |  |
Intersegment and intrasegment revenues | 422.1 |  | 439.9 |  |
Total revenues | 2,140.7 |  | 1,974.6 |  |
Equity in income (loss) of unconsolidated affiliates | (3.4) |  | (6.5) |  |
Gross operating margin | 170.9 |  | 97.8 |  |
Property, plant and equipment, net (see Note 6) | 2,548.4 |  |  | 2,559.5 |
Investments in unconsolidated affiliates (see Note 7) | 73.0 |  |  | 72.3 |
Intangible assets, net: (see Note 8) | 104.6 |  |  | 106.2 |
Goodwill: (see Note 8) | 1,055.3 |  |  | 1,056.0 |
Segment assets | 3,781.3 |  |  | 3,794.0 |
Other Investment [Member] |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | 0 |  | 0 |  |
Revenues from related parties | 0 |  | 0 |  |
Intersegment and intrasegment revenues | 0 |  | 0 |  |
Total revenues | 0 |  | 0 |  |
Equity in income (loss) of unconsolidated affiliates | 0 |  | 2.4 |  |
Gross operating margin | 0 |  | 2.4 |  |
Property, plant and equipment, net (see Note 6) | 0 |  |  | 0 |
Investments in unconsolidated affiliates (see Note 7) | 0 |  |  | 0 |
Intangible assets, net: (see Note 8) | 0 |  |  | 0 |
Goodwill: (see Note 8) | 0 |  |  | 0 |
Segment assets | 0 |  |  | 0 |
Adjustments and Eliminations [Member] |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |
Revenues from third parties | 0 |  | 0 |  |
Revenues from related parties | 0 |  | 0 |  |
Intersegment and intrasegment revenues | (5,414.0) |  | (5,216.0) |  |
Total revenues | (5,414.0) |  | (5,216.0) |  |
Equity in income (loss) of unconsolidated affiliates | 0 |  | 0 |  |
Gross operating margin | 0 |  | 0 |  |
Property, plant and equipment, net (see Note 6) | 1,990.5 |  |  | 2,113.1 |
Investments in unconsolidated affiliates (see Note 7) | 0 |  |  | 0 |
Intangible assets, net: (see Note 8) | 0 |  |  | 0 |
Goodwill: (see Note 8) | 0 |  |  | 0 |
Segment assets | $ 1,990.5 |  |  | $ 2,113.1 |
[1] | The total carrying amount of goodwill at March 31, 2013 and December 31, 2012 is net of $1.3 million of accumulated impairment charges. No goodwill impairment charges were recorded during the three months ended March 31, 2013.

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