Intangible Assets and Goodwill, Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						1 Months Ended					12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009		May 31, 2010 State Line and Fairplay [Member]	Jun. 30, 2010 Marine Transportation Business [Member]	Aug. 31, 2010 Crude Oil Trucking Business [Member]	Sep. 30, 2010 Trucking Business Acquired From EPCO [Member]	Nov. 30, 2010 Certain Assets Related to Marine Shipyard Operations [Member]	Dec. 31, 2011 NGL Pipelines & Services [Member]		Dec. 31, 2010 NGL Pipelines & Services [Member]		Dec. 31, 2009 NGL Pipelines & Services [Member]		Dec. 31, 2011 Onshore Natural Gas Pipelines & Services [Member]		Dec. 31, 2010 Onshore Natural Gas Pipelines & Services [Member]		Dec. 31, 2009 Onshore Natural Gas Pipelines & Services [Member]		Dec. 31, 2011 Onshore Crude Oil Pipelines & Services [Member]		Dec. 31, 2010 Onshore Crude Oil Pipelines & Services [Member]		Dec. 31, 2009 Onshore Crude Oil Pipelines & Services [Member]		Dec. 31, 2011 Offshore Pipelines & Services [Member]		Dec. 31, 2010 Offshore Pipelines & Services [Member]		Dec. 31, 2009 Offshore Pipelines & Services [Member]		Dec. 31, 2011 Petrochemical & Refined Products Services [Member]		Dec. 31, 2010 Petrochemical & Refined Products Services [Member]		Dec. 31, 2009 Petrochemical & Refined Products Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	$ 2,107.7	[1]	$ 2,018.3	[1]	$ 2,019.6							$ 341.2	[1]	$ 341.2	[1]	$ 341.2		$ 311.1	[1]	$ 284.9	[1]	$ 284.9		$ 311.2	[1]	$ 303.0	[1]	$ 303.0		$ 82.1	[1]	$ 82.1	[1]	$ 82.1		$ 1,062.1	[1]	$ 1,007.1	[1]	$ 1,008.4
Impairment charges					(1.3)	[2]										0	[2]					0	[2]					0	[2]					0	[2]					(1.3)	[2]
Goodwill related to acquisitions			89.4				26.2	6.1	2.1	5.5	49.5			0						26.2						8.2						0						55.0
Goodwill adjustment	(0.6)	[3]										0	[3]					0	[3]					0	[3]					0	[3]					(0.6)	[3]
Goodwill related to the sale of assets	(14.8)	[4]										0	[4]					(14.8)	[4]					0	[4]					0	[4]					0	[4]
Balance at end of period	2,092.3	[1]	2,107.7	[1]	2,018.3	[1]						341.2	[1]	341.2	[1]	341.2	[1]	296.3	[1]	311.1	[1]	284.9	[1]	311.2	[1]	311.2	[1]	303.0	[1]	82.1	[1]	82.1	[1]	82.1	[1]	1,061.5	[1]	1,062.1	[1]	1,007.1	[1]
Accumulated impairment charges	$ 1.3		$ 1.3		$ 1.3

[1] The total carrying amount of goodwill at December 31, 2011, 2010 and 2009 is net of $1.3 million of accumulated impairment charges.

[2] See Note 6 for information regarding impairment charges recorded during 2009.

[3] The goodwill we recorded in connection with a marine business acquisition completed in November 2010 was subsequently reduced in May 2011 due to a purchase price adjustment.

[4] In December 2011, we sold our ownership interests in Crystal, including related goodwill. See Note 8 for additional information regarding the sale of Crystal.