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Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | $ 26,955.6 | $ 47,879.7 | $ 47,661.1 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 72.3 | 71.5 | 65.9 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Total revenues |  | $ 6,155.0 | $ 6,307.9 | $ 7,092.5 | $ 7,472.5 | $ 10,190.3 | $ 12,330.2 | $ 12,520.8 | $ 12,909.9 | 27,027.9 | 47,951.2 | 47,727.0 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 373.6 | 259.5 | 167.3 |
Gross operating margin |  |  |  |  |  |  |  |  |  | 5,332.1 | 5,286.5 | 4,818.1 |
Property, plant and equipment, net |  | 32,034.7 |  |  |  | 29,881.6 |  |  |  | 32,034.7 | 29,881.6 | 26,946.6 |
Investments in unconsolidated affiliates |  | 2,628.5 |  |  |  | 3,042.0 |  |  |  | 2,628.5 | 3,042.0 | 2,437.1 |
Intangible assets, net |  | 4,037.2 |  |  |  | 4,302.1 |  |  |  | 4,037.2 | 4,302.1 | 1,462.2 |
Goodwill |  | 5,745.2 |  |  |  | 4,300.2 |  |  |  | 5,745.2 | 4,300.2 | 2,080.0 | $ 2,086.8
Segment assets |  | 44,445.6 |  |  |  | 41,525.9 |  |  |  | 44,445.6 | 41,525.9 | 32,925.9 |
NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 9,788.0 | 17,089.8 | 17,120.2 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 57.5 | 30.6 | 15.7 |
Intangible assets, net |  | 380.3 |  |  |  | 689.2 |  |  |  | 380.3 | 689.2 |  |
Goodwill |  | 2,651.7 |  |  |  | 2,210.2 |  |  |  | 2,651.7 | 2,210.2 | 341.2 | 341.2
Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 10,305.9 | 20,184.3 | 20,650.4 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 281.4 | 184.6 | 140.3 |
Intangible assets, net |  | 2,377.5 |  |  |  | 2,223.6 |  |  |  | 2,377.5 | 2,223.6 |  |
Goodwill |  | 1,841.0 |  |  |  | 918.7 |  |  |  | 1,841.0 | 918.7 | 305.1 | 311.2
Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 2,743.3 | 4,203.8 | 3,538.5 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 3.8 | 3.6 | 3.8 |
Intangible assets, net |  | 1,087.7 |  |  |  | 972.9 |  |  |  | 1,087.7 | 972.9 |  |
Goodwill |  | 296.3 |  |  |  | 296.3 |  |  |  | 296.3 | 296.3 | 296.3 | 296.3
Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 4,111.9 | 6,316.5 | 6,258.5 |
Equity in income (loss) of unconsolidated affiliates | [1] |  |  |  |  |  |  |  |  | (15.7) | (13.3) | (22.3) |
Intangible assets, net |  | 191.7 |  |  |  | 374.8 |  |  |  | 191.7 | 374.8 |  |
Goodwill |  | 956.2 |  |  |  | 793.0 |  |  |  | 956.2 | 793.0 | 1,055.3 | 1,056.0
Offshore Pipelines And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 78.8 | 156.8 | 159.4 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 46.6 | 54.0 | 29.8 |
Intangible assets, net | [2] | 0.0 |  |  |  | 41.6 |  |  |  | 0.0 | 41.6 |  |
Goodwill |  | 0.0 |  |  |  | 82.0 |  |  |  | 0.0 | 82.0 | 82.1 | $ 82.1
Reportable Business Segments [Member] | NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 9,779.0 | 17,078.4 | 17,119.1 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 9.0 | 11.4 | 1.1 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 10,217.9 | 13,716.5 | 11,096.6 |
Total revenues |  |  |  |  |  |  |  |  |  | 20,005.9 | 30,806.3 | 28,216.8 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 57.5 | 30.6 | 15.7 |
Gross operating margin |  |  |  |  |  |  |  |  |  | 2,771.6 | 2,877.7 | 2,514.4 |
Property, plant and equipment, net |  | 12,909.7 |  |  |  | 11,766.9 |  |  |  | 12,909.7 | 11,766.9 | 9,957.8 |
Investments in unconsolidated affiliates |  | 718.7 |  |  |  | 682.3 |  |  |  | 718.7 | 682.3 | 645.5 |
Intangible assets, net |  | 380.3 |  |  |  | 689.2 |  |  |  | 380.3 | 689.2 | 285.2 |
Goodwill |  | 2,651.7 |  |  |  | 2,210.2 |  |  |  | 2,651.7 | 2,210.2 | 341.2 |
Segment assets |  | 16,660.4 |  |  |  | 15,348.6 |  |  |  | 16,660.4 | 15,348.6 | 11,229.7 |
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 10,258.3 | 20,151.9 | 20,609.1 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 47.6 | 32.4 | 41.3 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 5,162.0 | 12,678.7 | 10,222.3 |
Total revenues |  |  |  |  |  |  |  |  |  | 15,467.9 | 32,863.0 | 30,872.7 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 281.4 | 184.6 | 140.3 |
Gross operating margin |  |  |  |  |  |  |  |  |  | 961.9 | 762.5 | 742.7 |
Property, plant and equipment, net |  | 3,550.3 |  |  |  | 2,332.2 |  |  |  | 3,550.3 | 2,332.2 | 1,479.9 |
Investments in unconsolidated affiliates |  | 1,813.4 |  |  |  | 1,767.7 |  |  |  | 1,813.4 | 1,767.7 | 1,165.2 |
Intangible assets, net |  | 2,377.5 |  |  |  | 2,223.6 |  |  |  | 2,377.5 | 2,223.6 | 4.5 |
Goodwill |  | 1,841.0 |  |  |  | 918.7 |  |  |  | 1,841.0 | 918.7 | 305.1 |
Segment assets |  | 9,582.2 |  |  |  | 7,242.2 |  |  |  | 9,582.2 | 7,242.2 | 2,954.7 |
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 2,729.5 | 4,182.6 | 3,522.7 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 13.8 | 21.2 | 15.8 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 662.1 | 1,106.7 | 959.7 |
Total revenues |  |  |  |  |  |  |  |  |  | 3,405.4 | 5,310.5 | 4,498.2 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 3.8 | 3.6 | 3.8 |
Gross operating margin |  |  |  |  |  |  |  |  |  | 782.6 | 803.3 | 789.0 |
Property, plant and equipment, net |  | 8,620.0 |  |  |  | 8,835.5 |  |  |  | 8,620.0 | 8,835.5 | 8,917.3 |
Investments in unconsolidated affiliates |  | 22.5 |  |  |  | 23.2 |  |  |  | 22.5 | 23.2 | 24.2 |
Intangible assets, net |  | 1,087.7 |  |  |  | 972.9 |  |  |  | 1,087.7 | 972.9 | 1,017.8 |
Goodwill |  | 296.3 |  |  |  | 296.3 |  |  |  | 296.3 | 296.3 | 296.3 |
Segment assets |  | 10,026.5 |  |  |  | 10,127.9 |  |  |  | 10,026.5 | 10,127.9 | 10,255.6 |
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 4,111.9 | 6,316.5 | 6,258.5 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 1,126.0 | 1,779.6 | 1,764.0 |
Total revenues |  |  |  |  |  |  |  |  |  | 5,237.9 | 8,096.1 | 8,022.5 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (15.7) | (13.3) | (22.3) |
Gross operating margin |  |  |  |  |  |  |  |  |  | 718.5 | 681.0 | 625.9 |
Property, plant and equipment, net |  | 3,060.7 |  |  |  | 3,047.2 |  |  |  | 3,060.7 | 3,047.2 | 2,712.4 |
Investments in unconsolidated affiliates |  | 73.9 |  |  |  | 75.1 |  |  |  | 73.9 | 75.1 | 70.4 |
Intangible assets, net |  | 191.7 |  |  |  | 374.8 |  |  |  | 191.7 | 374.8 | 100.0 |
Goodwill |  | 956.2 |  |  |  | 793.0 |  |  |  | 956.2 | 793.0 | 1,055.3 |
Segment assets |  | 4,282.5 |  |  |  | 4,290.1 |  |  |  | 4,282.5 | 4,290.1 | 3,938.1 |
Reportable Business Segments [Member] | Offshore Pipelines And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 76.9 | 150.3 | 151.7 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 1.9 | 6.5 | 7.7 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 0.6 | 6.5 | 9.6 |
Total revenues |  |  |  |  |  |  |  |  |  | 79.4 | 163.3 | 169.0 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 46.6 | 54.0 | 29.8 |
Gross operating margin |  |  |  |  |  |  |  |  |  | 97.5 | 162.0 | 146.1 |
Property, plant and equipment, net |  | 0.0 |  |  |  | 1,145.1 |  |  |  | 0.0 | 1,145.1 | 1,223.7 |
Investments in unconsolidated affiliates |  | 0.0 |  |  |  | 493.7 |  |  |  | 0.0 | 493.7 | 531.8 |
Intangible assets, net |  | 0.0 |  |  |  | 41.6 |  |  |  | 0.0 | 41.6 | 54.7 |
Goodwill |  | 0.0 |  |  |  | 82.0 |  |  |  | 0.0 | 82.0 | 82.1 |
Segment assets |  | 0.0 |  |  |  | 1,762.4 |  |  |  | 0.0 | 1,762.4 | 1,892.3 |
Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | (17,168.6) | (29,288.0) | (24,052.2) |
Total revenues |  |  |  |  |  |  |  |  |  | (17,168.6) | (29,288.0) | (24,052.2) |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Gross operating margin |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Property, plant and equipment, net |  | 3,894.0 |  |  |  | 2,754.7 |  |  |  | 3,894.0 | 2,754.7 | 2,655.5 |
Investments in unconsolidated affiliates |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |
Intangible assets, net |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |
Goodwill |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |
Segment assets |  | $ 3,894.0 |  |  |  | $ 2,754.7 |  |  |  | $ 3,894.0 | $ 2,754.7 | $ 2,655.5 |
[1] | Losses are primarily attributable to our investment in Centennial. As a result of a trend in declining earnings, we estimated the fair value of this equity-method investment during each of the last three fiscal years. Our estimates, based on a combination of the market and income approaches, indicate that the fair value of this investment remains substantially in excess of its carrying value.
[2] | Our intangible assets classified within the Offshore Pipelines & Services segment were sold to Genesis in July 2015 (see Note 5).

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