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Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | $ 7,291.0 |  | $ 5,674.6 |  | $ 5,230.7 |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 36,426.5 |  | 29,196.5 |  | 22,965.6 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 107.7 |  | 45.0 |  | 56.7 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0 |
Total revenues |  | $ 9,182.3 | $ 9,585.9 | $ 8,467.5 | $ 9,298.5 | $ 8,426.6 | $ 6,886.9 | $ 6,607.6 | $ 7,320.4 | 36,534.2 | [1] | 29,241.5 | [2] | 23,022.3 | [2]
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 480.0 |  | 426.0 |  | 362.0 |
Property, plant and equipment, net |  | 38,737.6 |  |  |  | 35,620.4 |  |  |  | 38,737.6 |  | 35,620.4 |  | 33,292.5 |
Investments in unconsolidated affiliates |  | 2,615.1 |  |  |  | 2,659.4 |  |  |  | 2,615.1 |  | 2,659.4 |  | 2,677.3 |
Intangible assets, net |  | 3,608.4 |  |  |  | 3,690.3 |  |  |  | 3,608.4 |  | 3,690.3 |  | 3,864.1 |
Goodwill |  | 5,745.2 |  |  |  | 5,745.2 |  |  |  | 5,745.2 |  | 5,745.2 |  | 5,745.2 |
Segment assets |  | 50,706.3 |  |  |  | 47,715.3 |  |  |  | 50,706.3 |  | 47,715.3 |  | 45,579.1 |
NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 15,648.9 | [1] | 12,468.0 | [2] | 10,242.5 | [2]
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 117.0 |  | 73.4 |  | 61.4 |
Intangible assets, net |  | 380.1 |  |  |  | 322.3 |  |  |  | 380.1 |  | 322.3 |  |  |
Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 11,042.6 | [1] | 8,156.8 | [2] | 6,515.0 | [2]
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 365.4 |  | 358.4 |  | 311.9 |
Intangible assets, net |  | 2,094.6 |  |  |  | 2,186.5 |  |  |  | 2,094.6 |  | 2,186.5 |  |  |
Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 3,454.4 | [1] | 3,145.6 | [2] | 2,543.0 | [2]
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 6.8 |  | 3.8 |  | 3.8 |
Intangible assets, net |  | 979.3 |  |  |  | 1,018.4 |  |  |  | 979.3 |  | 1,018.4 |  |  |
Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 6,388.3 | [1] | 5,471.1 | [2] | 3,721.8 | [2]
Equity in income (loss) of unconsolidated affiliates | [3] |  |  |  |  |  |  |  |  | (9.2) |  | (9.6) |  | (15.1) |
Intangible assets, net |  | 154.4 |  |  |  | 163.1 |  |  |  | 154.4 |  | 163.1 |  |  |
Reportable Business Segments [Member] | NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 3,830.7 |  | 3,258.3 |  | 2,990.6 |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 15,630.5 |  | 12,455.7 |  | 10,232.7 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 18.4 |  | 12.3 |  | 9.8 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 26,453.6 |  | 27,278.6 |  | 19,150.0 |
Total revenues |  |  |  |  |  |  |  |  |  | 42,102.5 |  | 39,746.6 |  | 29,392.5 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 117.0 |  | 73.4 |  | 61.4 |
Property, plant and equipment, net |  | 14,845.4 |  |  |  | 13,831.2 |  |  |  | 14,845.4 |  | 13,831.2 |  | 14,091.5 |
Investments in unconsolidated affiliates |  | 662.0 |  |  |  | 733.9 |  |  |  | 662.0 |  | 733.9 |  | 750.4 |
Intangible assets, net |  | 380.1 |  |  |  | 322.3 |  |  |  | 380.1 |  | 322.3 |  | 350.2 |
Goodwill |  | 2,651.7 |  |  |  | 2,651.7 |  |  |  | 2,651.7 |  | 2,651.7 |  | 2,651.7 |
Segment assets |  | 18,539.2 |  |  |  | 17,539.1 |  |  |  | 18,539.2 |  | 17,539.1 |  | 17,843.8 |
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 1,511.3 |  | 987.2 |  | 854.6 |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 10,968.2 |  | 8,137.2 |  | 6,478.7 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 74.4 |  | 19.6 |  | 36.3 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 35,490.4 |  | 15,943.0 |  | 9,052.0 |
Total revenues |  |  |  |  |  |  |  |  |  | 46,533.0 |  | 24,099.8 |  | 15,567.0 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 365.4 |  | 358.4 |  | 311.9 |
Property, plant and equipment, net |  | 5,847.7 |  |  |  | 5,208.4 |  |  |  | 5,847.7 |  | 5,208.4 |  | 4,216.1 |
Investments in unconsolidated affiliates |  | 1,867.5 |  |  |  | 1,839.2 |  |  |  | 1,867.5 |  | 1,839.2 |  | 1,824.6 |
Intangible assets, net |  | 2,094.6 |  |  |  | 2,186.5 |  |  |  | 2,094.6 |  | 2,186.5 |  | 2,279.0 |
Goodwill |  | 1,841.0 |  |  |  | 1,841.0 |  |  |  | 1,841.0 |  | 1,841.0 |  | 1,841.0 |
Segment assets |  | 11,650.8 |  |  |  | 11,075.1 |  |  |  | 11,650.8 |  | 11,075.1 |  | 10,160.7 |
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 891.2 |  | 714.5 |  | 734.9 |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 3,439.5 |  | 3,132.5 |  | 2,532.4 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 14.9 |  | 13.1 |  | 10.6 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 721.9 |  | 850.8 |  | 668.5 |
Total revenues |  |  |  |  |  |  |  |  |  | 4,176.3 |  | 3,996.4 |  | 3,211.5 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 6.8 |  | 3.8 |  | 3.8 |
Property, plant and equipment, net |  | 8,303.8 |  |  |  | 8,375.0 |  |  |  | 8,303.8 |  | 8,375.0 |  | 8,403.0 |
Investments in unconsolidated affiliates |  | 22.8 |  |  |  | 20.8 |  |  |  | 22.8 |  | 20.8 |  | 21.7 |
Intangible assets, net |  | 979.3 |  |  |  | 1,018.4 |  |  |  | 979.3 |  | 1,018.4 |  | 1,054.5 |
Goodwill |  | 296.3 |  |  |  | 296.3 |  |  |  | 296.3 |  | 296.3 |  | 296.3 |
Segment assets |  | 9,602.2 |  |  |  | 9,710.5 |  |  |  | 9,602.2 |  | 9,710.5 |  | 9,775.5 |
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross operating margin |  |  |  |  |  |  |  |  |  | 1,057.8 |  | 714.6 |  | 650.6 |
Revenues from third parties |  |  |  |  |  |  |  |  |  | 6,388.3 |  | 5,471.1 |  | 3,721.8 |
Revenues from related parties |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0 |
Intersegment and intrasegment revenues |  |  |  |  |  |  |  |  |  | 2,917.5 |  | 1,766.9 |  | 1,234.8 |
Total revenues |  |  |  |  |  |  |  |  |  | 9,305.8 |  | 7,238.0 |  | 4,956.6 |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (9.2) |  | (9.6) |  | (15.1) |
Property, plant and equipment, net |  | 6,213.9 |  |  |  | 3,507.7 |  |  |  | 6,213.9 |  | 3,507.7 |  | 3,261.2 |
Investments in unconsolidated affiliates |  | 62.8 |  |  |  | 65.5 |  |  |  | 62.8 |  | 65.5 |  | 80.6 |
Intangible assets, net |  | 154.4 |  |  |  | 163.1 |  |  |  | 154.4 |  | 163.1 |  | 180.4 |
Goodwill |  | 956.2 |  |  |  | 956.2 |  |  |  | 956.2 |  | 956.2 |  | 956.2 |
Segment assets |  | 7,387.3 |  |  |  | 4,692.5 |  |  |  | 7,387.3 |  | 4,692.5 |  | 4,478.4 |
Eliminations [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 |  |  |  |  |  |  |  |  |  | (65,583.4) |  | (45,839.3) |  | (30,105.3) |
Total revenues |  |  |  |  |  |  |  |  |  | (65,583.4) |  | (45,839.3) |  | (30,105.3) |
Equity in income (loss) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0 |
Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  | 3,526.8 |  |  |  | 4,698.1 |  |  |  | 3,526.8 |  | 4,698.1 |  | 3,320.7 |
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 |  | $ 3,526.8 |  |  |  | $ 4,698.1 |  |  |  | $ 3,526.8 |  | $ 4,698.1 |  | $ 3,320.7 |
[1] | Revenues are accounted for under ASC 606 upon implementation at January 1, 2018.
[2] | Revenues are accounted for under ASC 605 for historical periods prior to January 1, 2018.
[3] | 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.

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