Business Combinations (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended									12 Months Ended													8 Months Ended		1 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009		Dec. 31, 2010 NGL Pipelines & Services [Member]	Dec. 31, 2009 NGL Pipelines & Services [Member]	Dec. 31, 2010 Onshore Natural Gas Pipelines & Services [Member]	Dec. 31, 2009 Onshore Natural Gas Pipelines & Services [Member]	Dec. 31, 2010 Onshore Crude Oil Pipelines & Services [Member]	Dec. 31, 2009 Onshore Crude Oil Pipelines & Services [Member]	Dec. 31, 2010 Petrochemical & Refined Products Services [Member]	Dec. 31, 2009 Petrochemical & Refined Products Services [Member]	Dec. 31, 2010 State Line and Fairplay [Member]	May 31, 2010 State Line and Fairplay [Member]	Nov. 30, 2010 Cenac [Member]	Nov. 30, 2010 Bigler [Member]	Jun. 30, 2010 Marine Transportation Business [Member]	Aug. 31, 2010 Crude Oil Trucking Business [Member]	Dec. 31, 2009 Martin Midstream Partners [Member]	Dec. 31, 2009 TransMontaigne Product Services [Member]	Dec. 31, 2009 Rio Grande Pipeline Company [Member]
Business combinations [Line Items]
Total cash used for business combinations										$ 0	$ 1,313.9		$ 107.3		$ 105.6	$ 33.3	$ 1,111.1	$ 0.8	$ 10.2	$ 0	$ 87.0	$ 73.2
Assets acquired in business combination:
Current assets					3.3						3.3		1.4
Property, plant and equipment, net					421.4						421.4		115.9
Intangible assets					907.6						907.6		0.3
Other assets					0						0		(0.3)
Total assets acquired					1,332.3						1,332.3		117.3
Liabilities assumed in business combination:
Current liabilities					(0.4)						(0.4)		0.3
Long-term debt					(1.3)						(1.3)		0
Other long-term liabilities					(0.9)						(0.9)		0
Total liabilities assumed					(2.6)						(2.6)		0.3
Total assets acquired plus liabilities assumed					1,329.7						1,329.7		117.6
Noncontrolling interests acquired					0						0		10.3
Fair value of 2,329,639 of our units					99.7						99.7		0
Total cash used for business combinations										0	1,313.9		107.3		105.6	33.3	1,111.1	0.8	10.2	0	87.0	73.2
Goodwill					83.9	[1]					83.9	[1]	0	[1]
Transactions [Abstract]
Percentage ownership acquired (in hundredths)																								100.00%
Purchase price of acquisition																									141.9
Cash paid for acquisition																								1,200.0	42.2	38.5	12.0	4.0	23.7	50.0	32.8
Common units issued for acquisition (in units)																									2,329,639
Revenues from acquired assets																							119.8
Net income from acquired assets																							14.4
Pro forma earnings data:
Revenues											33,804.7		25,643.2
Costs and expenses											31,713.4		23,879.2
Operating income											2,153.3		1,856.3
Net income											1,388.2		1,135.7
Net income attributable to partners											$ 321.0		$ 203.9
Basic earnings per unit:
As reported basic units outstanding (in units)										824,600,000	274,500,000		206,700,000
Pro forma basic units outstanding (in units)											274,500,000		206,700,000
As reported basic earnings per unit (in dollars per unit)	$ 0.85	$ 0.57	$ 0.53	$ 0.52	$ 0.34		$ 0.18	$ 0.26	$ 0.33	$ 2.48	$ 1.17		$ 0.99
Pro forma basic earnings per unit (in dollars per unit)											$ 1.17		$ 0.99
Diluted earnings per unit:
As reported diluted units outstanding (in units)										859,900,000	278,500,000		206,700,000
Pro forma diluted units outstanding (in units)											278,500,000		206,700,000
As reported diluted earnings per unit (in dollars per unit)	$ 0.82	$ 0.55	$ 0.51	$ 0.49	$ 0.33		$ 0.18	$ 0.26	$ 0.33	$ 2.38	$ 1.15		$ 0.99
Pro forma diluted earnings per unit (in dollars per unit)											$ 1.15		$ 0.99

[1] See Note 11 for additional information regarding goodwill.