Investments in Unconsolidated Affiliates (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			3 Months Ended																	3 Months Ended				3 Months Ended							3 Months Ended													3 Months Ended											3 Months Ended		1 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 NGL Pipelines and Services [Member]	Mar. 31, 2012 NGL Pipelines and Services [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member]	Mar. 31, 2013 NGL Pipelines and Services [Member] Venice Energy Service Company LLC [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member] Venice Energy Service Company LLC [Member]	Mar. 31, 2013 NGL Pipelines and Services [Member] K/D/S Promix, LLC [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member] K/D/S Promix, LLC [Member]	Mar. 31, 2013 NGL Pipelines and Services [Member] Baton Rouge Fractionators LLC [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member] Baton Rouge Fractionators LLC [Member]	Mar. 31, 2013 NGL Pipelines and Services [Member] Skelly-Belvieu Pipeline Company, LLC [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member] Skelly-Belvieu Pipeline Company, LLC [Member]	Mar. 31, 2013 NGL Pipelines and Services [Member] Texas Express Pipeline LLC [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member] Texas Express Pipeline LLC [Member]	Mar. 31, 2013 NGL Pipelines and Services [Member] Texas Express Gathering LLC [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member] Texas Express Gathering LLC [Member]	Mar. 31, 2013 NGL Pipelines and Services [Member] Front Range Pipeline LLC [Member]	Dec. 31, 2012 NGL Pipelines and Services [Member] Front Range Pipeline LLC [Member]	Mar. 31, 2013 Onshore Natural Gas Pipelines And Services [Member]	Mar. 31, 2012 Onshore Natural Gas Pipelines And Services [Member]	Mar. 31, 2013 Onshore Natural Gas Pipelines And Services [Member] White River Hub, LLC [Member]	Dec. 31, 2012 Onshore Natural Gas Pipelines And Services [Member] White River Hub, LLC [Member]	Mar. 31, 2013 Onshore Crude Oil Pipelines and Services [Member]	Mar. 31, 2012 Onshore Crude Oil Pipelines and Services [Member]	Dec. 31, 2012 Onshore Crude Oil Pipelines and Services [Member]	Mar. 31, 2013 Onshore Crude Oil Pipelines and Services [Member] Seaway Crude Pipeline Company [Member]	Dec. 31, 2012 Onshore Crude Oil Pipelines and Services [Member] Seaway Crude Pipeline Company [Member]	Mar. 31, 2013 Onshore Crude Oil Pipelines and Services [Member] Eagle Ford Pipeline LLC [Member]	Dec. 31, 2012 Onshore Crude Oil Pipelines and Services [Member] Eagle Ford Pipeline LLC [Member]	Mar. 31, 2013 Offshore Pipelines And Services [Member]	Mar. 31, 2012 Offshore Pipelines And Services [Member]	Dec. 31, 2012 Offshore Pipelines And Services [Member]	Mar. 31, 2013 Offshore Pipelines And Services [Member] Poseidon Oil Pipeline Company, LLC [Member]	Dec. 31, 2012 Offshore Pipelines And Services [Member] Poseidon Oil Pipeline Company, LLC [Member]	Mar. 31, 2013 Offshore Pipelines And Services [Member] Cameron Highway Oil Pipeline Company [Member]	Dec. 31, 2012 Offshore Pipelines And Services [Member] Cameron Highway Oil Pipeline Company [Member]	Mar. 31, 2013 Offshore Pipelines And Services [Member] Deepwater Gateway LLC [Member]	Dec. 31, 2012 Offshore Pipelines And Services [Member] Deepwater Gateway LLC [Member]	Mar. 31, 2013 Offshore Pipelines And Services [Member] Neptune Pipeline Company, LLC [Member]	Dec. 31, 2012 Offshore Pipelines And Services [Member] Neptune Pipeline Company, LLC [Member]	Mar. 31, 2013 Offshore Pipelines And Services [Member] Southeast Keathley Canyon Pipeline Company, LLC [Member]	Dec. 31, 2012 Offshore Pipelines And Services [Member] Southeast Keathley Canyon Pipeline Company, LLC [Member]	Mar. 31, 2013 Petrochemical and Refined Products Services [Member]	Mar. 31, 2012 Petrochemical and Refined Products Services [Member]	Dec. 31, 2012 Petrochemical and Refined Products Services [Member]	Mar. 31, 2013 Petrochemical and Refined Products Services [Member] Baton Rouge Propylene Concentrator, LLC [Member]	Dec. 31, 2012 Petrochemical and Refined Products Services [Member] Baton Rouge Propylene Concentrator, LLC [Member]	Mar. 31, 2013 Petrochemical and Refined Products Services [Member] Centennial Pipeline LLC [Member]	Dec. 31, 2012 Petrochemical and Refined Products Services [Member] Centennial Pipeline LLC [Member]	Mar. 31, 2013 Petrochemical and Refined Products Services [Member] Other Unconsolidated Affiliates [Member]		Dec. 31, 2012 Petrochemical and Refined Products Services [Member] Other Unconsolidated Affiliates [Member]		Mar. 31, 2013 Other Investment [Member]	Mar. 31, 2012 Other Investment [Member]	Jan. 18, 2012 Other Investment [Member] Energy Transfer Equity [Member]	Mar. 31, 2012 Other Investment [Member] Energy Transfer Equity [Member]	Dec. 31, 2011 Other Investment [Member] Energy Transfer Equity [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest (in hundredths)							13.10%		50.00%		32.20%		50.00%		35.00%		45.00%		33.30%				50.00%					50.00%		50.00%					36.00%		50.00%		50.00%		25.70%		50.00%					30.00%		50.00%										13.10%
Investments in unconsolidated affiliates	$ 1,679.0		$ 1,394.6				$ 29.9	$ 29.6	$ 46.2	$ 46.9	$ 20.3	$ 20.2	$ 38.7	$ 38.2	$ 196.2	$ 144.4	$ 25.4	$ 20.9	$ 55.4	$ 24.4			$ 24.6	$ 24.9				$ 463.6	$ 341.4	$ 196.7	$ 152.4				$ 46.2	$ 47.3	$ 212.2	$ 220.0	$ 88.8	$ 90.0	$ 45.6	$ 46.8	$ 116.2	$ 74.9				$ 8.2	$ 8.5	$ 61.9	$ 60.8	$ 2.9	[1]	$ 3.0	[1]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	44.5	9.9		3.9	5.2																1.0	1.4			36.6	0.5						6.4	6.9												(3.4)	(6.5)										0	2.4
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	62.9		63.7	28.6		28.9																			18.3		18.5					13.3		13.6											2.7		2.7
Equity method investment amortization of excess cost	0.8	1.1		0.3	0.2																				0.2	0.2						0.3	0.3												0	0.1										0	0.3
Number of common units owned accounted for under equity method (in units)																																																												29,303,514
Number of Energy Transfer Equity common units sold (in units)																																																										22,762,636
Proceeds from the sale of Energy Transfer Equity common units																																																										825.1
Investment in equity securities - available-for-sale
Number of Energy Transfer Equity common units sold (in units)																																																											3,569,232
Proceeds from the sale of available-for-sale securities																																																											150.8
Gain on sales of Energy Transfer Equity common units																																																										27.5	25.8
Summarized income statement information of unconsolidated affiliates [Abstract]
Revenues				83.4	110.9																2.9	30.9			78.5	12.3						42.3	41.1												6.0	5.4
Operating Income (Loss)				15.3	27.0																1.9	2.6			71.7	0.8						18.0	19.1												(3.9)	(9.4)
Net Income (Loss)				$ 15.2	$ 27.0																$ 1.9	$ 2.6			$ 67.9	$ 0.8						$ 17.3	$ 18.4												$ (5.8)	$ (11.4)

[1] Other unconsolidated affiliates include a 50% interest in a propylene pipeline extending from Mont Belvieu, Texas to La Porte, Texas and a 25% interest in a company that provides logistics communications solutions between petroleum pipelines and their customers.