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Business Segments, Consolidated Revenues and Expenses (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Consolidated Revenues [Abstract]

Total consolidated revenues

$ 9,585.9

^[1]

$ 6,886.9

^[2]

$ 27,351.9

^[1]

$ 20,814.9

^[2]

Operating costs and expenses:

Cost of sales

^[3]

6,838.9

5,049.6

20,371.2

15,116.4

Other operating costs and expenses

^[4]

735.7

637.4

2,143.1

1,853.4

Depreciation, amortization and accretion

429.4

383.9

1,249.0

1,139.3

Asset impairment and related charges

4.6

10.0

21.4

35.2

Net gains attributable to asset sales

(6.7)

(1.1)

(8.1)

(1.1)

General and administrative costs

52.7

41.3

157.1

137.4

Total consolidated costs and expenses

8,054.6

6,121.1

23,933.7

18,280.6

NGL Pipelines & Services [Member]

Consolidated Revenues [Abstract]

Total consolidated revenues

4,622.9

^[1]

2,914.3

^[2]

11,309.9

^[1]

8,880.7

^[2]

Crude Oil Pipelines & Services [Member]

Consolidated Revenues [Abstract]

Total consolidated revenues

2,494.9

^[1]

1,796.7

^[2]

8,847.0

^[1]

5,503.5

^[2]

Natural Gas Pipelines & Services [Member]

Consolidated Revenues [Abstract]

Total consolidated revenues

850.2

^[1]

796.6

^[2]

2,447.8

^[1]

2,344.0

^[2]

Petrochemical & Refined Products Services [Member]

Consolidated Revenues [Abstract]

Total consolidated revenues

$ 1,617.9

^[1]

$ 1,379.3

^[2]

$ 4,747.2

^[1]

$ 4,086.7

^[2]

[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]	Cost of sales is a component of "Operating costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations. Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.
[4]	Represents the cost of operating our plants, pipelines and other fixed assets excluding: depreciation, amortization and accretion charges; asset impairment and related charges; and net losses (or gains) attributable to asset sales.

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- Definition

The amount of expense recognized and charged to operating costs and expenses in the current period that reflects the allocation of the cost of assets over the assets' useful lives.

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