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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010 NGL Pipelines & Services [Member]	Dec. 31, 2010 Onshore Natural Gas Pipelines & Services [Member]	Dec. 31, 2010 Onshore Crude Oil Pipelines & Services [Member]	Dec. 31, 2010 Petrochemical & Refined Products Services [Member]	Dec. 31, 2010 State Line and Fairplay [Member]	May 31, 2010 State Line and Fairplay [Member]	Nov. 30, 2010 Marine Shipyard Business [Member]	Nov. 30, 2010 Bigler [Member]	Jun. 30, 2010 Marine Transportation Business [Member]	Aug. 31, 2010 Crude Oil Trucking Business [Member]
Business combinations [Line Items]
Total cash used for business combinations									$ 0	$ 0	$ 1,313.9	$ 105.6	$ 1,111.1	$ 10.2	$ 87.0
Assets acquired in business combination:
Current assets											3.3
Property, plant and equipment, net											421.4
Intangible assets											907.6
Total assets acquired											1,332.3
Liabilities assumed in business combination:
Current liabilities											(0.4)
Long-term debt											(1.3)
Other long-term liabilities											(0.9)
Total liabilities assumed											(2.6)
Total assets acquired plus liabilities assumed											1,329.7
Fair value of 2,329,639 of our units issued as consideration											99.7
Total cash used for business combinations									0	0	1,313.9	105.6	1,111.1	10.2	87.0
Residual Goodwill (see Note 11)											83.9
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
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
Costs and expenses											31,713.4
Operating income											2,153.3
Net income											1,388.2
Net income attributable to limited partners											$ 321.0
Basic earnings per unit:
As reported basic units outstanding (in units)											274,500,000
Pro forma basic units outstanding (in units)											274,500,000
As reported basic earnings per unit (in dollars per unit)	$ 0.70	$ 0.68	$ 0.66	$ 0.76	$ 0.85	$ 0.57	$ 0.53	$ 0.52	$ 2.81	$ 2.48	$ 1.17
Pro forma basic earnings per unit (in dollars per unit)											$ 1.17
Diluted earnings per unit:
As reported diluted units outstanding (in units)									893,200,000	859,900,000	278,500,000
Pro forma diluted units outstanding (in units)											278,500,000
As reported diluted earnings per unit (in dollars per unit)	$ 0.68	$ 0.66	$ 0.64	$ 0.73	$ 0.82	$ 0.55	$ 0.51	$ 0.49	$ 2.71	$ 2.38	$ 1.15
Pro forma diluted earnings per unit (in dollars per unit)											$ 1.15