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Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | $ 5,674.6 | $ 5,230.7 | $ 5,332.1 |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 29,196.5 | 22,965.6 | 26,955.6 |  |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 45.0 | 56.7 | 72.3 |  |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |  |
Total revenues |  | $ 8,426.6 | $ 6,886.9 | $ 6,607.6 | $ 7,320.4 | $ 6,478.8 | $ 5,920.4 | $ 5,617.8 | $ 5,005.3 | 29,241.5 | 23,022.3 | 27,027.9 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 426.0 | 362.0 | 373.6 |  |
Property, plant and equipment, net |  | 35,620.4 |  |  |  | 33,292.5 |  |  |  | 35,620.4 | 33,292.5 | 32,034.7 |  |
Investments in unconsolidated affiliates |  | 2,659.4 |  |  |  | 2,677.3 |  |  |  | 2,659.4 | 2,677.3 | 2,628.5 |  |
Intangible assets, net |  | 3,690.3 |  |  |  | 3,864.1 |  |  |  | 3,690.3 | 3,864.1 | 4,037.2 |  |
Goodwill |  | 5,745.2 |  |  |  | 5,745.2 |  |  |  | 5,745.2 | 5,745.2 | 5,745.2 |  | $ 4,300.2
Segment assets |  | 47,715.3 |  |  |  | 45,579.1 |  |  |  | 47,715.3 | 45,579.1 | 44,445.6 |  |
NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 12,468.0 | 10,242.5 | 9,788.0 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 73.4 | 61.4 | 57.5 |  |
Intangible assets, net |  | 322.3 |  |  |  | 350.2 |  |  |  | 322.3 | 350.2 |  |  |
Goodwill |  | 2,651.7 |  |  |  | 2,651.7 |  |  |  | 2,651.7 | 2,651.7 | 2,651.7 |  | 2,210.2
Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 8,156.8 | 6,515.0 | 10,305.9 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 358.4 | 311.9 | 281.4 |  |
Intangible assets, net |  | 2,186.5 |  |  |  | 2,279.0 |  |  |  | 2,186.5 | 2,279.0 |  |  |
Goodwill |  | 1,841.0 |  |  |  | 1,841.0 |  |  |  | 1,841.0 | 1,841.0 | 1,841.0 |  | 918.7
Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 3,145.6 | 2,543.0 | 2,743.3 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 3.8 | 3.8 | 3.8 |  |
Intangible assets, net |  | 1,018.4 |  |  |  | 1,054.5 |  |  |  | 1,018.4 | 1,054.5 |  |  |
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 |  |  |  |  |  |  |  |  |  | 5,471.1 | 3,721.8 | 4,111.9 |  |
Equity in income (loss) of unconsolidated affiliates | [1] |  |  |  |  |  |  |  |  | (9.6) | (15.1) | (15.7) |  |
Intangible assets, net |  | 163.1 |  |  |  | 180.4 |  |  |  | 163.1 | 180.4 |  |  |
Goodwill |  | 956.2 |  |  |  | 956.2 |  |  |  | 956.2 | 956.2 | 956.2 |  | 793.0
Offshore Pipelines And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 78.8 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 46.6 | [2] |
Goodwill |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |  | $ 82.0
Reportable Business Segments [Member] | NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 3,258.3 | 2,990.6 | 2,771.6 |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 12,455.7 | 10,232.7 | 9,779.0 |  |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 12.3 | 9.8 | 9.0 |  |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 27,278.6 | 19,150.0 | 10,217.9 |  |
Total revenues |  |  |  |  |  |  |  |  |  | 39,746.6 | 29,392.5 | 20,005.9 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 73.4 | 61.4 | 57.5 |  |
Property, plant and equipment, net |  | 13,831.2 |  |  |  | 14,091.5 |  |  |  | 13,831.2 | 14,091.5 | 12,909.7 |  |
Investments in unconsolidated affiliates |  | 733.9 |  |  |  | 750.4 |  |  |  | 733.9 | 750.4 | 718.7 |  |
Intangible assets, net |  | 322.3 |  |  |  | 350.2 |  |  |  | 322.3 | 350.2 | 380.3 |  |
Goodwill |  | 2,651.7 |  |  |  | 2,651.7 |  |  |  | 2,651.7 | 2,651.7 | 2,651.7 |  |
Segment assets |  | 17,539.1 |  |  |  | 17,843.8 |  |  |  | 17,539.1 | 17,843.8 | 16,660.4 |  |
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 987.2 | 854.6 | 961.9 |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 8,137.2 | 6,478.7 | 10,258.3 |  |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 19.6 | 36.3 | 47.6 |  |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 15,943.0 | 9,052.0 | 5,162.0 |  |
Total revenues |  |  |  |  |  |  |  |  |  | 24,099.8 | 15,567.0 | 15,467.9 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 358.4 | 311.9 | 281.4 |  |
Property, plant and equipment, net |  | 5,208.4 |  |  |  | 4,216.1 |  |  |  | 5,208.4 | 4,216.1 | 3,550.3 |  |
Investments in unconsolidated affiliates |  | 1,839.2 |  |  |  | 1,824.6 |  |  |  | 1,839.2 | 1,824.6 | 1,813.4 |  |
Intangible assets, net |  | 2,186.5 |  |  |  | 2,279.0 |  |  |  | 2,186.5 | 2,279.0 | 2,377.5 |  |
Goodwill |  | 1,841.0 |  |  |  | 1,841.0 |  |  |  | 1,841.0 | 1,841.0 | 1,841.0 |  |
Segment assets |  | 11,075.1 |  |  |  | 10,160.7 |  |  |  | 11,075.1 | 10,160.7 | 9,582.2 |  |
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 714.5 | 734.9 | 782.6 |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 3,132.5 | 2,532.4 | 2,729.5 |  |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 13.1 | 10.6 | 13.8 |  |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 850.8 | 668.5 | 662.1 |  |
Total revenues |  |  |  |  |  |  |  |  |  | 3,996.4 | 3,211.5 | 3,405.4 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 3.8 | 3.8 | 3.8 |  |
Property, plant and equipment, net |  | 8,375.0 |  |  |  | 8,403.0 |  |  |  | 8,375.0 | 8,403.0 | 8,620.0 |  |
Investments in unconsolidated affiliates |  | 20.8 |  |  |  | 21.7 |  |  |  | 20.8 | 21.7 | 22.5 |  |
Intangible assets, net |  | 1,018.4 |  |  |  | 1,054.5 |  |  |  | 1,018.4 | 1,054.5 | 1,087.7 |  |
Goodwill |  | 296.3 |  |  |  | 296.3 |  |  |  | 296.3 | 296.3 | 296.3 |  |
Segment assets |  | 9,710.5 |  |  |  | 9,775.5 |  |  |  | 9,710.5 | 9,775.5 | 10,026.5 |  |
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 714.6 | 650.6 | 718.5 |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 5,471.1 | 3,721.8 | 4,111.9 |  |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |  |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 1,766.9 | 1,234.8 | 1,126.0 |  |
Total revenues |  |  |  |  |  |  |  |  |  | 7,238.0 | 4,956.6 | 5,237.9 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (9.6) | (15.1) | (15.7) |  |
Property, plant and equipment, net |  | 3,507.7 |  |  |  | 3,261.2 |  |  |  | 3,507.7 | 3,261.2 | 3,060.7 |  |
Investments in unconsolidated affiliates |  | 65.5 |  |  |  | 80.6 |  |  |  | 65.5 | 80.6 | 73.9 |  |
Intangible assets, net |  | 163.1 |  |  |  | 180.4 |  |  |  | 163.1 | 180.4 | 191.7 |  |
Goodwill |  | 956.2 |  |  |  | 956.2 |  |  |  | 956.2 | 956.2 | 956.2 |  |
Segment assets |  | 4,692.5 |  |  |  | 4,478.4 |  |  |  | 4,692.5 | 4,478.4 | 4,282.5 |  |
Reportable Business Segments [Member] | Offshore Pipelines And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 97.5 |  |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 76.9 |  |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.9 |  |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.6 |  |
Total revenues |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 79.4 |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 46.6 |  |
Property, plant and equipment, net |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |  |
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 |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 |  |
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 |  |  |  |  |  |  |  |  |  | (45,839.3) | (30,105.3) | (17,168.6) |  |
Total revenues |  |  |  |  |  |  |  |  |  | (45,839.3) | (30,105.3) | (17,168.6) |  |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |  |
Property, plant and equipment, net |  | 4,698.1 |  |  |  | 3,320.7 |  |  |  | 4,698.1 | 3,320.7 | 3,894.0 |  |
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 |  | $ 4,698.1 |  |  |  | $ 3,320.7 |  |  |  | $ 4,698.1 | $ 3,320.7 | $ 3,894.0 |  |
[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 market and income approaches, indicate that the fair value of this investment remains in excess of its carrying value.
[2] | Our investments in unconsolidated affiliates classified within the Offshore Pipelines & Services segment were sold in July 2015 (see Note 10).

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