Investments in Unconsolidated Affiliates (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended						1 Months Ended	3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Jan. 18, 2012	Apr. 27, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 3,042.0		$ 2,437.1
Non-cash asset impairment charges			4.8
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	259.5		167.3		64.3
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	59.6		58.1
Equity method investment amortization of excess cost	3.3		3.3		3.4
Forecasted amortization of excess cost amounts - 2015	3.3
Forecasted amortization of excess cost amounts - 2016	3.3
Forecasted amortization of excess cost amounts - 2017	3.3
Forecasted amortization of excess cost amounts - 2018	3.3
Forecasted amortization of excess cost amounts - 2019	3.3
NGL Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	30.6		15.7		15.9
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	26.5		27.7
Equity method investment amortization of excess cost	1.2		1.2		1.0
NGL Pipelines & Services [Member] | Venice Energy Service Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	13.10%
Investments in unconsolidated affiliates	27.7		27.6
NGL Pipelines & Services [Member] | K/D/S Promix, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%
Investments in unconsolidated affiliates	38.5		45.4
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	32.20%
Investments in unconsolidated affiliates	18.8		19.5
NGL Pipelines & Services [Member] | Skelly-Belvieu Pipeline Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%
Investments in unconsolidated affiliates	40.1		40.8
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	35.00%
Investments in unconsolidated affiliates	349.3		339.9
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	45.00%
Investments in unconsolidated affiliates	37.9		37.8
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	33.30%
Investments in unconsolidated affiliates	170.0		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	3.6		3.8		4.4
Onshore Natural Gas Pipelines & Services [Member] | White River Hub, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%
Investments in unconsolidated affiliates	23.2		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	184.6		140.3		32.6
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	21.7		17.8
Equity method investment amortization of excess cost	0.9		0.7		0.7
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%
Investments in unconsolidated affiliates	1,431.2		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%
Investments in unconsolidated affiliates	336.5		224.5
Offshore Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	54.0		29.8		26.9
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	9.0		10.0
Equity method investment amortization of excess cost	1.0		1.3		1.2
Offshore Pipelines & Services [Member] | Poseidon Oil Pipeline Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	36.00%
Investments in unconsolidated affiliates	31.8		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%
Investments in unconsolidated affiliates	201.3		207.7
Offshore Pipelines & Services [Member] | Deepwater Gateway, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%
Investments in unconsolidated affiliates	79.6		84.5
Offshore Pipelines & Services [Member] | Neptune Pipeline Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	25.70%
Investments in unconsolidated affiliates	34.9		38.7
Non-cash asset impairment charges			4.8
Offshore Pipelines & Services [Member] | Southeast Keathley Canyon Pipeline Company L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%
Investments in unconsolidated affiliates	146.1		159.2
Petrochemical & Refined Products Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	(13.3)	[1]	(22.3)	[1]	(17.9)	[1]
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	2.4		2.6
Equity method investment amortization of excess cost	0.2		0.1		0.2
Petrochemical & Refined Products Services [Member] | Baton Rouge Propylene Concentrator, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	30.00%
Investments in unconsolidated affiliates	6.5		7.6
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)	50.00%
Investments in unconsolidated affiliates	66.1		60.1
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	2.5		2.7
Other Investment [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	0	[2]	0	[2]	2.4	[2]
Unamortized excess cost amounts by business segment [Abstract]
Equity method investment amortization of excess cost	0	[3]	0	[3]	0.3	[3]
Other Investment [Member] | Energy Transfer Equity [Member]
Other Investments [Abstract]
Percentage exceeded on ownership interests (in hundredths)									3.00%
Number of Energy Transfer Equity common units sold (in units)							22,762,636	6,540,878
Proceeds from the sale of Energy Transfer Equity common units							825.1	270.2
Gain on the sale of Energy Transfer Equity common units					$ 68.8

[1] 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 the market and income approaches, indicate that the fair value of this investment remains substantially in excess of its carrying value.

[2] With respect to the year ended December 31, 2012, the amount presented reflects our equity in the income of Energy Transfer Equity from January 1, 2012 to January 18, 2012.

[3] Reflects amortization of excess cost amounts related to our investment in Energy Transfer Equity through January 18, 2012, which is the date we ceased using the equity method to account for this investment.