Investments in Unconsolidated Affiliates (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended					3 Months Ended		9 Months Ended																			3 Months Ended		9 Months Ended								3 Months Ended		9 Months Ended							3 Months Ended		9 Months Ended													3 Months Ended		9 Months Ended											3 Months Ended				9 Months Ended						1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011	Sep. 30, 2012 NGL Pipelines and Services [Member]	Sep. 30, 2011 NGL Pipelines and Services [Member]	Sep. 30, 2012 NGL Pipelines and Services [Member]	Sep. 30, 2011 NGL Pipelines and Services [Member]	Dec. 31, 2011 NGL Pipelines and Services [Member]	Sep. 30, 2012 NGL Pipelines and Services [Member] Venice Energy Service Company LLC [Member]	Dec. 31, 2011 NGL Pipelines and Services [Member] Venice Energy Service Company LLC [Member]	Sep. 30, 2012 NGL Pipelines and Services [Member] K/D/S Promix, LLC [Member]	Dec. 31, 2011 NGL Pipelines and Services [Member] K/D/S Promix, LLC [Member]	Sep. 30, 2012 NGL Pipelines and Services [Member] Baton Rouge Fractionators LLC [Member]	Dec. 31, 2011 NGL Pipelines and Services [Member] Baton Rouge Fractionators LLC [Member]	Sep. 30, 2012 NGL Pipelines and Services [Member] Skelly-Belvieu Pipeline Company, LLC [Member]	Dec. 31, 2011 NGL Pipelines and Services [Member] Skelly-Belvieu Pipeline Company, LLC [Member]	Sep. 30, 2012 NGL Pipelines and Services [Member] Texas Express Pipeline LLC [Member]	Dec. 31, 2011 NGL Pipelines and Services [Member] Texas Express Pipeline LLC [Member]	Sep. 30, 2012 NGL Pipelines and Services [Member] Texas Express Gathering LLC [Member]		Dec. 31, 2011 NGL Pipelines and Services [Member] Texas Express Gathering LLC [Member]		Sep. 30, 2012 NGL Pipelines and Services [Member] Front Range Pipeline LLC [Member]	Dec. 31, 2011 NGL Pipelines and Services [Member] Front Range Pipeline LLC [Member]	Sep. 30, 2012 Onshore Natural Gas Pipelines And Services [Member]	Sep. 30, 2011 Onshore Natural Gas Pipelines And Services [Member]	Sep. 30, 2012 Onshore Natural Gas Pipelines And Services [Member]	Sep. 30, 2011 Onshore Natural Gas Pipelines And Services [Member]	Sep. 30, 2012 Onshore Natural Gas Pipelines And Services [Member] Evangeline [Member]		Dec. 31, 2011 Onshore Natural Gas Pipelines And Services [Member] Evangeline [Member]		Sep. 30, 2012 Onshore Natural Gas Pipelines And Services [Member] White River Hub, LLC [Member]	Dec. 31, 2011 Onshore Natural Gas Pipelines And Services [Member] White River Hub, LLC [Member]	Sep. 30, 2012 Onshore Crude Oil Pipelines and Services [Member]	Sep. 30, 2011 Onshore Crude Oil Pipelines and Services [Member]	Sep. 30, 2012 Onshore Crude Oil Pipelines and Services [Member]	Sep. 30, 2011 Onshore Crude Oil Pipelines and Services [Member]	Dec. 31, 2011 Onshore Crude Oil Pipelines and Services [Member]	Sep. 30, 2012 Onshore Crude Oil Pipelines and Services [Member] Seaway Crude Pipeline Company [Member]	Dec. 31, 2011 Onshore Crude Oil Pipelines and Services [Member] Seaway Crude Pipeline Company [Member]	Sep. 30, 2012 Onshore Crude Oil Pipelines and Services [Member] Eagle Ford Pipeline LLC [Member]	Dec. 31, 2011 Onshore Crude Oil Pipelines and Services [Member] Eagle Ford Pipeline LLC [Member]	Sep. 30, 2012 Offshore Pipelines And Services [Member]	Sep. 30, 2011 Offshore Pipelines And Services [Member]	Sep. 30, 2012 Offshore Pipelines And Services [Member]	Sep. 30, 2011 Offshore Pipelines And Services [Member]	Dec. 31, 2011 Offshore Pipelines And Services [Member]	Sep. 30, 2012 Offshore Pipelines And Services [Member] Poseidon Oil Pipeline Company, LLC [Member]	Dec. 31, 2011 Offshore Pipelines And Services [Member] Poseidon Oil Pipeline Company, LLC [Member]	Sep. 30, 2012 Offshore Pipelines And Services [Member] Cameron Highway Oil Pipeline Company [Member]	Dec. 31, 2011 Offshore Pipelines And Services [Member] Cameron Highway Oil Pipeline Company [Member]	Sep. 30, 2012 Offshore Pipelines And Services [Member] Deepwater Gateway LLC [Member]	Dec. 31, 2011 Offshore Pipelines And Services [Member] Deepwater Gateway LLC [Member]	Sep. 30, 2012 Offshore Pipelines And Services [Member] Neptune Pipeline Company, LLC [Member]	Dec. 31, 2011 Offshore Pipelines And Services [Member] Neptune Pipeline Company, LLC [Member]	Sep. 30, 2012 Offshore Pipelines And Services [Member] Southeast Keathley Canyon Pipeline Company, LLC [Member]	Dec. 31, 2011 Offshore Pipelines And Services [Member] Southeast Keathley Canyon Pipeline Company, LLC [Member]	Sep. 30, 2012 Petrochemical and Refined Products Services [Member]	Sep. 30, 2011 Petrochemical and Refined Products Services [Member]	Sep. 30, 2012 Petrochemical and Refined Products Services [Member]	Sep. 30, 2011 Petrochemical and Refined Products Services [Member]	Dec. 31, 2011 Petrochemical and Refined Products Services [Member]	Sep. 30, 2012 Petrochemical and Refined Products Services [Member] Baton Rouge Propylene Concentrator, LLC [Member]	Dec. 31, 2011 Petrochemical and Refined Products Services [Member] Baton Rouge Propylene Concentrator, LLC [Member]	Sep. 30, 2012 Petrochemical and Refined Products Services [Member] Centennial Pipeline LLC [Member]	Dec. 31, 2011 Petrochemical and Refined Products Services [Member] Centennial Pipeline LLC [Member]	Sep. 30, 2012 Petrochemical and Refined Products Services [Member] Other Unconsolidated Affiliates [Member]		Dec. 31, 2011 Petrochemical and Refined Products Services [Member] Other Unconsolidated Affiliates [Member]		Sep. 30, 2012 Other Investment [Member]		Sep. 30, 2011 Other Investment [Member]		Sep. 30, 2012 Other Investment [Member]		Sep. 30, 2011 Other Investment [Member]		Dec. 31, 2011 Other Investment [Member]		Jan. 18, 2012 Other Investment [Member] Energy Transfer Equity [Member]	Apr. 27, 2012 Other Investment [Member] Energy Transfer Equity [Member]	Sep. 30, 2012 Other Investment [Member] Energy Transfer Equity [Member]		Sep. 30, 2011 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%						0.00%				50.00%							50.00%		50.00%							36.00%		50.00%		50.00%		25.70%		50.00%							30.00%		50.00%
Ownership interest (in hundredths)																																																																																										0.00%
Investments in unconsolidated affiliates	$ 1,160.4				$ 1,160.4				$ 1,859.6						$ 31.9	$ 35.5	$ 41.6	$ 40.7	$ 19.9	$ 21.0	$ 37.9	$ 35.0	$ 79.9	$ 13.9	$ 18.6	[1]	$ 0	[1]	$ 12.1	$ 0					$ 0	[2]	$ 4.4	[2]	$ 25.2	$ 25.7						$ 254.6	$ 170.7	$ 117.1	$ 0						$ 48.3	$ 55.4	$ 217.3	$ 222.8	$ 90.8	$ 94.6	$ 48.1	$ 51.1	$ 57.5	$ 1.0						$ 8.2	$ 9.5	$ 48.4	$ 51.8	$ 3.0	[3]	$ 3.4	[3]													$ 0	[4]		$ 1,023.1	[4]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income of unconsolidated affiliates	21.0		8.6		42.2		35.9			3.0	4.3	12.0	16.4																		0.9	1.4	3.5	4.1							16.5	(1.0)	20.6	(3.1)						6.8	5.4	17.8	20.3												(6.2)	(3.8)	(14.1)	(13.1)										0	[5]	2.3	[5]	2.4	[5]	11.3	[5]
Unamortized excess cost amounts by business segment [Abstract]
Unamortized excess cost amounts	59.4				59.4				1,180.6	24.0		24.0		24.7																											18.7		18.7		19.2					13.9		13.9		14.8											2.8		2.8		2.9									0	[6]			0	[6]			1,119.0	[6]
Equity method investment amortization of excess cost	0.7		7.9		2.5		26.9			0.2	0.3	0.7	0.8																												0.2	0.1	0.5	0.5						0.3	0.3	0.9	0.9												0	0.1	0.1	0.1										0	[7]	7.1	[7]	0.3	[7]	24.6	[7]
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				8,564,136
Proceeds from the sale of Energy Transfer Equity common units																																																																																								825.1				333.5
Gain on the sale of Energy Transfer Equity common units	0	[8]	19.4	[8]	0	[8]	24.8	[8]																																																																																				24.8
Investment in equity securities - available-for-sale
Number of Energy Transfer Equity common units sold (in units)																																																																																									6,540,878
Proceeds from the sale of available-for-sale securities																																																																																									270.2
Gain on sales of Energy Transfer Equity common units					68.8		24.8																																																																																			68.8
Summarized income statement information of unconsolidated affiliates [Abstract]
Revenues										63.9	105.2	246.3	321.7																		2.8	59.5	8.5	149.7							49.8	11.9	83.6	32.7						42.5	38.8	122.7	128.8												4.0	5.9	15.3	25.2										0		2,097.9		0		6,061.9
Operating Income (Loss)										4.9	20.7	47.2	74.6																		1.8	2.9	5.5	8.2							43.2	(0.5)	51.4	(2.1)						18.1	15.0	50.0	51.6												(9.9)	(4.8)	(19.6)	(17.2)										0		270.0		0		894.8
Net Income (Loss)										$ 4.9	$ 20.5	$ 47.1	$ 74.5																		$ 1.8	$ 3.0	$ 5.5	$ 8.3							$ 33.0	$ (0.5)	$ 41.1	$ (2.1)						$ 17.4	$ 14.6	$ 48.3	$ 50.8												$ (11.8)	$ (6.9)	$ (25.6)	$ (23.7)										$ 0		$ 69.1		$ 0		$ 224.0

[1] In April 2012, we, along with Enbridge Midcoast Energy, LP ("Enbridge") and WGR Asset Holding Company LLC formed a new joint venture, TEG, to design and construct two NGL gathering systems to complement the Texas Express Pipeline. Enbridge will construct and operate the systems, which are expected to begin service in the second quarter of 2013.

[2] In June 2012, we acquired the remaining ownership interests in Evangeline Gas Pipeline Company, L.P. and Evangeline Gas Corp. (collectively "Evangeline") and they became wholly owned subsidiaries of ours.

[3] 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.

[4] We ceased using the equity method to account for our investment in Energy Transfer Equity limited partner units effective January 18, 2012 and began accounting for them as available-for-sale securities. We completed the sale of the remaining Energy Transfer Equity units in April 2012 (see below).

[5] With respect to the nine months ended September 30, 2012, the amount presented reflects our equity in the income of Energy Transfer Equity from January 1, 2012 to January 18, 2012.

[6] On January 18, 2012, we discontinued using the equity method to account for our investment in Energy Transfer Equity common units and began accounting for this investment as an available-for-sale security. As a result, we no longer recognized any excess cost amounts associated with this investment.

[7] Reflects amortization of excess cost amounts related to our investment in Energy Transfer Equity from January 1, 2012 through January 18, 2012, which is the date we ceased using the equity method to account for this investment.

[8] Amounts pertain to sales of limited partner interests in Energy Transfer Equity while this investment was accounted for using the equity method. See Note 7 for information regarding these sales.