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Investments in Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,879.3		$ 2,879.3		$ 2,437.1
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	50.3	37.6	106.8	82.1
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	56.5		56.5		58.1
Equity method investment amortization of excess cost	0.9	0.9	1.6	1.7
NGL Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	6.1	3.8	7.5	7.7
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	27.0		27.0		27.7
Equity method investment amortization of excess cost	0.4	0.3	0.7	0.6
NGL Pipelines & Services [Member] | Venice Energy Service Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	13.10%		13.10%
Investments in unconsolidated affiliates	28.8		28.8		27.6
NGL Pipelines & Services [Member] | K/D/S Promix, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	45.8		45.8		45.4
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	32.20%		32.20%
Investments in unconsolidated affiliates	19.6		19.6		19.5
NGL Pipelines & Services [Member] | Skelly-Belvieu Pipeline Company, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	39.5		39.5		40.8
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	35.00%		35.00%
Investments in unconsolidated affiliates	344.7		344.7		339.9
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	45.00%		45.00%
Investments in unconsolidated affiliates	37.4		37.4		37.8
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	33.30%		33.30%
Investments in unconsolidated affiliates	165.1		165.1		134.5
Onshore Natural Gas Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	0.9	0.9	1.8	1.9
Onshore Natural Gas Pipelines & Services [Member] | White River Hub, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	23.6		23.6		24.2
Onshore Crude Oil Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	42.2	30.1	84.9	66.7
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	17.5		17.5		17.8
Equity method investment amortization of excess cost	0.1	0.2	0.3	0.4
Onshore Crude Oil Pipelines & Services [Member] | Seaway Crude Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	1,329.8		1,329.8		940.7
Onshore Crude Oil Pipelines & Services [Member] | Eagle Ford Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	247.3		247.3		224.5
Offshore Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	7.6	8.7	18.7	15.1
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	9.5		9.5		10.0
Equity method investment amortization of excess cost	0.3	0.4	0.5	0.7
Offshore Pipelines & Services [Member] | Poseidon Oil Pipeline Company, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	36.00%		36.00%
Investments in unconsolidated affiliates	37.9		37.9		41.7
Offshore Pipelines & Services [Member] | Cameron Highway Oil Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	203.7		203.7		207.7
Offshore Pipelines & Services [Member] | Deepwater Gateway LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	81.1		81.1		84.5
Offshore Pipelines & Services [Member] | Neptune Pipeline Company, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	25.70%		25.70%
Investments in unconsolidated affiliates	36.7		36.7		38.7
Offshore Pipelines & Services [Member] | Southeast Keathley Canyon Pipeline Company, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	163.4		163.4		159.2
Petrochemical & Refined Products Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	(6.5)	(5.9)	(6.1)	(9.3)
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	2.5		2.5		2.6
Equity method investment amortization of excess cost	0.1	0	0.1	0
Petrochemical & Refined Products Services [Member] | Baton Rouge Propylene Concentrator, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	30.00%		30.00%
Investments in unconsolidated affiliates	7.1		7.1		7.6
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%		50.00%
Investments in unconsolidated affiliates	65.2		65.2		60.1
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2.6		$ 2.6		$ 2.7

X

- Definition

If the price paid to acquire an ownership interest exceeded the underlying book value of the capital accounts acquired, such excess cost amounts are included within the carrying values of the investments. These costs were attributable to the underlying tangible and amortizable intangible assets of certain unconsolidated affiliates, and are amortized as a reduction in equity earnings in a manner similar to depreciation. This represents the amortization of such excess cost amounts for the period.

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- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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-Name Accounting Standards Codification

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- Definition

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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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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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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