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Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Segment gross operating margin | $ 2,123.6 |  | $ 1,304.4 |  | $ 5,160.0 |  | $ 4,157.1 |  |
Revenues from third parties | 9,571.7 |  | 6,874.4 |  | 27,257.4 |  | 20,781.7 |  |
Revenues from related parties | 14.2 |  | 12.5 |  | 94.5 |  | 33.2 |  |
Intersegment and intrasegment revenues | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Total revenues | 9,585.9 | [1] | 6,886.9 | [2] | 27,351.9 | [1] | 20,814.9 | [2] |
Equity in income (loss) of unconsolidated affiliates | 112.0 |  | 113.4 |  | 350.0 |  | 315.2 |  |
Property, plant and equipment, net | 37,802.9 |  |  |  | 37,802.9 |  |  |  | $ 35,620.4
Investments in unconsolidated affiliates | 2,603.4 |  |  |  | 2,603.4 |  |  |  | 2,659.4
Intangible assets, net | 3,654.2 |  |  |  | 3,654.2 |  |  |  | 3,690.3
Goodwill | 5,745.2 |  |  |  | 5,745.2 |  |  |  | 5,745.2
Segment assets | 49,805.7 |  |  |  | 49,805.7 |  |  |  | 47,715.3
NGL Pipelines & Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Total revenues | 4,622.9 | [1] | 2,914.3 | [2] | 11,309.9 | [1] | 8,880.7 | [2] |
Equity in income (loss) of unconsolidated affiliates | 28.3 |  | 18.8 |  | 87.1 |  | 53.3 |  |
Intangible assets, net | 389.2 |  |  |  | 389.2 |  |  |  | 322.3
Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Total revenues | 2,494.9 | [1] | 1,796.7 | [2] | 8,847.0 | [1] | 5,503.5 | [2] |
Equity in income (loss) of unconsolidated affiliates | 83.7 |  | 95.9 |  | 265.1 |  | 266.3 |  |
Intangible assets, net | 2,119.2 |  |  |  | 2,119.2 |  |  |  | 2,186.5
Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Total revenues | 850.2 | [1] | 796.6 | [2] | 2,447.8 | [1] | 2,344.0 | [2] |
Equity in income (loss) of unconsolidated affiliates | 2.1 |  | 0.9 |  | 4.7 |  | 2.8 |  |
Intangible assets, net | 989.3 |  |  |  | 989.3 |  |  |  | 1,018.4
Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Total revenues | 1,617.9 | [1] | 1,379.3 | [2] | 4,747.2 | [1] | 4,086.7 | [2] |
Equity in income (loss) of unconsolidated affiliates | (2.1) |  | (2.2) |  | (6.9) |  | (7.2) |  |
Intangible assets, net | 156.5 |  |  |  | 156.5 |  |  |  | 163.1
Reportable Business Segments [Member] | NGL Pipelines & Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Segment gross operating margin | 1,063.1 |  | 770.9 |  | 2,861.7 |  | 2,386.8 |  |
Revenues from third parties | 4,616.7 |  | 2,911.1 |  | 11,295.1 |  | 8,871.9 |  |
Revenues from related parties | 6.2 |  | 3.2 |  | 14.8 |  | 8.8 |  |
Intersegment and intrasegment revenues | 6,814.9 |  | 5,055.1 |  | 19,384.4 |  | 19,572.0 |  |
Total revenues | 11,437.8 |  | 7,969.4 |  | 30,694.3 |  | 28,452.7 |  |
Equity in income (loss) of unconsolidated affiliates | 28.3 |  | 18.8 |  | 87.1 |  | 53.3 |  |
Property, plant and equipment, net | 14,847.7 |  |  |  | 14,847.7 |  |  |  | 13,831.2
Investments in unconsolidated affiliates | 658.2 |  |  |  | 658.2 |  |  |  | 733.9
Intangible assets, net | 389.2 |  |  |  | 389.2 |  |  |  | 322.3
Goodwill | 2,651.7 |  |  |  | 2,651.7 |  |  |  | 2,651.7
Segment assets | 18,546.8 |  |  |  | 18,546.8 |  |  |  | 17,539.1
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Segment gross operating margin | 594.2 |  | 190.4 |  | 867.0 |  | 691.7 |  |
Revenues from third parties | 2,490.7 |  | 1,790.7 |  | 8,777.2 |  | 5,489.1 |  |
Revenues from related parties | 4.2 |  | 6.0 |  | 69.8 |  | 14.4 |  |
Intersegment and intrasegment revenues | 6,278.8 |  | 2,552.9 |  | 27,683.6 |  | 9,410.6 |  |
Total revenues | 8,773.7 |  | 4,349.6 |  | 36,530.6 |  | 14,914.1 |  |
Equity in income (loss) of unconsolidated affiliates | 83.7 |  | 95.9 |  | 265.1 |  | 266.3 |  |
Property, plant and equipment, net | 5,665.2 |  |  |  | 5,665.2 |  |  |  | 5,208.4
Investments in unconsolidated affiliates | 1,859.8 |  |  |  | 1,859.8 |  |  |  | 1,839.2
Intangible assets, net | 2,119.2 |  |  |  | 2,119.2 |  |  |  | 2,186.5
Goodwill | 1,841.0 |  |  |  | 1,841.0 |  |  |  | 1,841.0
Segment assets | 11,485.2 |  |  |  | 11,485.2 |  |  |  | 11,075.1
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Segment gross operating margin | 216.9 |  | 170.7 |  | 628.2 |  | 536.0 |  |
Revenues from third parties | 846.4 |  | 793.3 |  | 2,437.9 |  | 2,334.0 |  |
Revenues from related parties | 3.8 |  | 3.3 |  | 9.9 |  | 10.0 |  |
Intersegment and intrasegment revenues | 186.6 |  | 220.1 |  | 522.5 |  | 635.2 |  |
Total revenues | 1,036.8 |  | 1,016.7 |  | 2,970.3 |  | 2,979.2 |  |
Equity in income (loss) of unconsolidated affiliates | 2.1 |  | 0.9 |  | 4.7 |  | 2.8 |  |
Property, plant and equipment, net | 8,325.2 |  |  |  | 8,325.2 |  |  |  | 8,375.0
Investments in unconsolidated affiliates | 22.0 |  |  |  | 22.0 |  |  |  | 20.8
Intangible assets, net | 989.3 |  |  |  | 989.3 |  |  |  | 1,018.4
Goodwill | 296.3 |  |  |  | 296.3 |  |  |  | 296.3
Segment assets | 9,632.8 |  |  |  | 9,632.8 |  |  |  | 9,710.5
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Segment gross operating margin | 249.4 |  | 172.4 |  | 803.1 |  | 542.6 |  |
Revenues from third parties | 1,617.9 |  | 1,379.3 |  | 4,747.2 |  | 4,086.7 |  |
Revenues from related parties | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Intersegment and intrasegment revenues | 844.3 |  | 426.4 |  | 2,241.6 |  | 1,230.8 |  |
Total revenues | 2,462.2 |  | 1,805.7 |  | 6,988.8 |  | 5,317.5 |  |
Equity in income (loss) of unconsolidated affiliates | (2.1) |  | (2.2) |  | (6.9) |  | (7.2) |  |
Property, plant and equipment, net | 6,194.9 |  |  |  | 6,194.9 |  |  |  | 3,507.7
Investments in unconsolidated affiliates | 63.4 |  |  |  | 63.4 |  |  |  | 65.5
Intangible assets, net | 156.5 |  |  |  | 156.5 |  |  |  | 163.1
Goodwill | 956.2 |  |  |  | 956.2 |  |  |  | 956.2
Segment assets | 7,371.0 |  |  |  | 7,371.0 |  |  |  | 4,692.5
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 | (14,124.6) |  | (8,254.5) |  | (49,832.1) |  | (30,848.6) |  |
Total revenues | (14,124.6) |  | (8,254.5) |  | (49,832.1) |  | (30,848.6) |  |
Equity in income (loss) of unconsolidated affiliates | 0.0 |  | $ 0.0 |  | 0.0 |  | $ 0.0 |  |
Adjustments [Member] |  |  |  |  |  |  |  |  |
Information by business segment [Abstract] |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 2,769.9 |  |  |  | 2,769.9 |  |  |  | 4,698.1
Investments in unconsolidated affiliates | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Intangible assets, net | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Goodwill | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Segment assets | $ 2,769.9 |  |  |  | $ 2,769.9 |  |  |  | $ 4,698.1
[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.

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