Intangible Assets and Goodwill, Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	$ 2,092.3	$ 2,107.7		$ 2,018.3	[1]
Goodwill related to acquisitions				89.4	[2],[3]
Goodwill adjustment		(0.6)	[4]
Goodwill related to the sale of assets		(14.8)	[5]
Reclassification to assets held for sale	(5.5)
Balance at end of period	2,086.8	2,092.3		2,107.7
Accumulated impairment charges	1.3
NGL Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	341.2	341.2		341.2
Goodwill related to acquisitions				0
Goodwill adjustment		0
Goodwill related to the sale of assets		0
Reclassification to assets held for sale	0
Balance at end of period	341.2	341.2		341.2
Onshore Natural Gas Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	296.3	311.1		284.9
Goodwill related to acquisitions				26.2
Goodwill adjustment		0
Goodwill related to the sale of assets		(14.8)	[5]
Reclassification to assets held for sale	0
Balance at end of period	296.3	296.3		311.1
Onshore Crude Oil Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	311.2	311.2		303.0
Goodwill related to acquisitions				8.2
Goodwill adjustment		0
Goodwill related to the sale of assets		0
Reclassification to assets held for sale	0
Balance at end of period	311.2	311.2		311.2
Offshore Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	82.1	82.1		82.1
Goodwill related to acquisitions				0
Goodwill adjustment		0
Goodwill related to the sale of assets		0
Reclassification to assets held for sale	0
Balance at end of period	82.1	82.1		82.1
Petrochemical & Refined Products Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	1,061.5	1,062.1		1,007.1
Goodwill related to acquisitions				55.0	[2]
Goodwill adjustment		(0.6)	[4]
Goodwill related to the sale of assets		0
Reclassification to assets held for sale	(5.5)
Balance at end of period	$ 1,056.0	$ 1,061.5		$ 1,062.1

[1] The total carrying amount of goodwill at January 1, 2010 is net of $1.3 million of accumulated impairment charges incurred prior to 2010. No goodwill impairment charges were recorded during the three years ended December 31, 2012.

[2] Amount presented for Petrochemical & Refined Products Services includes $5.5 million of goodwill that was part of the drop down of trucking assets from EPCO (see Note 15).

[3] We attribute these goodwill amounts to our ability to leverage the acquired businesses with our existing asset base to create future business opportunities.

[4] 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.

[5] In December 2011, we disposed of our ownership interests in Crystal (see Note 8), including related goodwill.