The percentage ownership interest in a company.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

The amount of gross profit (loss) reported by an equity method investment of the entity.

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No definition available.

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The amount of net income (loss) reported by an equity method investment of the entity.

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- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 29, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,583.4			$ 2,659.4
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	115.7	$ 94.8
Income Statement Data:
Revenues	396.0	343.2
Operating income	243.7	203.7
Net income	242.3	202.9
NGL Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	$ 19.4	15.5
NGL Pipelines & Services [Member] \| Venice Energy Service Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	13.10%
Investments in unconsolidated affiliates	$ 24.6			25.7
NGL Pipelines & Services [Member] \| K/D/S Promix, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Investments in unconsolidated affiliates	$ 29.6			30.9
NGL Pipelines & Services [Member] \| Baton Rouge Fractionators LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	32.20%
Investments in unconsolidated affiliates	$ 16.8			17.0
NGL Pipelines & Services [Member] \| Skelly-Belvieu Pipeline Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Investments in unconsolidated affiliates	$ 36.4			37.0
NGL Pipelines & Services [Member] \| Texas Express Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	35.00%
Investments in unconsolidated affiliates	$ 310.5			314.4
NGL Pipelines & Services [Member] \| Texas Express Gathering LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	45.00%
Investments in unconsolidated affiliates	$ 35.7			35.9
NGL Pipelines & Services [Member] \| Front Range Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	33.30%
Investments in unconsolidated affiliates	$ 164.5			165.7
NGL Pipelines & Services [Member] \| Delaware Basin Gas Processing LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	100.00%
Investments in unconsolidated affiliates	$ 0.0			107.3
Remaining membership interest acquired			50.00%
Crude Oil Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	$ 97.9	81.2
Crude Oil Pipelines & Services [Member] \| Seaway Crude Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Investments in unconsolidated affiliates	$ 1,392.3			1,378.9
Crude Oil Pipelines & Services [Member] \| Eagle Ford Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Investments in unconsolidated affiliates	$ 387.8			385.2
Crude Oil Pipelines & Services [Member] \| Eagle Ford Terminals Corpus Christi LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Investments in unconsolidated affiliates	$ 92.4			75.1
Natural Gas Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	$ 1.0	1.0
Natural Gas Pipelines & Services [Member] \| White River Hub, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Investments in unconsolidated affiliates	$ 20.6			20.8
Petrochemical & Refined Products Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	$ (2.6)	$ (2.9)
Petrochemical & Refined Products Services [Member] \| Centennial Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Investments in unconsolidated affiliates	$ 57.9			60.8
Petrochemical & Refined Products Services [Member] \| Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 14.3			$ 4.7