Intangible Assets and Goodwill, Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	$ 2,086.8	[1]	$ 2,092.3	[1]	$ 2,107.7	[1]
Goodwill adjustment					(0.6)	[2]
Goodwill related to the sale of assets	(6.8)				(14.8)	[3]
Reclassification to assets held for sale			(5.5)
Balance at end of period	2,080.0	[1]	2,086.8	[1]	2,092.3	[1]
Accumulated impairment charges	1.3
NGL Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	341.2	[1]	341.2	[1]	341.2	[1]
Goodwill adjustment					0	[2]
Goodwill related to the sale of assets	0				0	[3]
Reclassification to assets held for sale			0
Balance at end of period	341.2	[1]	341.2	[1]	341.2	[1]
Onshore Natural Gas Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	296.3	[1]	296.3	[1]	311.1	[1]
Goodwill adjustment					0	[2]
Goodwill related to the sale of assets	0				(14.8)	[3]
Reclassification to assets held for sale			0
Balance at end of period	296.3	[1]	296.3	[1]	296.3	[1]
Onshore Crude Oil Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	311.2	[1]	311.2	[1]	311.2	[1]
Goodwill adjustment					0	[2]
Goodwill related to the sale of assets	(6.1)				0	[3]
Reclassification to assets held for sale			0
Balance at end of period	305.1	[1]	311.2	[1]	311.2	[1]
Offshore Pipelines & Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	82.1	[1]	82.1	[1]	82.1	[1]
Goodwill adjustment					0	[2]
Goodwill related to the sale of assets	0				0	[3]
Reclassification to assets held for sale			0
Balance at end of period	82.1	[1]	82.1	[1]	82.1	[1]
Petrochemical & Refined Products Services [Member]
Changes in carrying amount of goodwill [Roll Forward]
Balance at beginning of period	1,056.0	[1]	1,061.5	[1]	1,062.1	[1]
Goodwill adjustment					(0.6)	[2]
Goodwill related to the sale of assets	(0.7)				0	[3]
Reclassification to assets held for sale			(5.5)
Balance at end of period	$ 1,055.3	[1]	$ 1,056.0	[1]	$ 1,061.5	[1]

[1] The total carrying amount of goodwill at December 31, 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, 2013.

[2] 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.

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