Derivative Instruments, Hedging Activities and Fair Value Measurements, Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								3 Months Ended			3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2012 Fair Value [Member]	Dec. 31, 2011 Fair Value [Member]	Mar. 31, 2012 Carrying Value [Member]	Dec. 31, 2011 Carrying Value [Member]	Mar. 31, 2012 NGL Pipelines & Services [Member]	Mar. 31, 2012 Petrochemical & Refined Products Services [Member]	Mar. 31, 2012 Level 3 [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Crude Oil [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Crude Oil [Member] Minimum [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Crude Oil [Member] Maximum [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Natural Gas [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Natural Gas [Member] Minimum [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Natural Gas [Member] Maximum [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Propane [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Propane [Member] Minimum [Member]	Mar. 31, 2012 Level 3 [Member] Liability Commodity Derivatives - Propane [Member] Maximum [Member]	Mar. 31, 2012 Level 3 [Member] Asset Commodity derivatives - Propane [Member]	Mar. 31, 2012 Level 3 [Member] Asset Commodity derivatives - Propane [Member] Minimum [Member]	Mar. 31, 2012 Level 3 [Member] Asset Commodity derivatives - Propane [Member] Maximum [Member]	Mar. 31, 2012 Level 3 [Member] Asset Commodity derivatives - Crude oil [Member]	Mar. 31, 2012 Level 3 [Member] Asset Commodity derivatives - Crude oil [Member] Minimum [Member]	Mar. 31, 2012 Level 3 [Member] Asset Commodity derivatives - Crude oil [Member] Maximum [Member]	Mar. 31, 2012 Level 3 [Member] Assets Commodity derivatives - Natural gas [Member]	Mar. 31, 2012 Level 3 [Member] Assets Commodity derivatives - Natural gas [Member] Minimum [Member]	Mar. 31, 2012 Level 3 [Member] Assets Commodity derivatives - Natural gas [Member] Maximum [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member]		Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member]		Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member]		Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value [Member]		Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]
Financial assets:
Investment in equity securities - available-for-sale	$ 119.8																													$ 119.8	[1]	$ 0	[1]	$ 0	[1]	$ 119.8	[1]
Interest rate derivatives																														0		37.4		0		37.4
Commodity derivatives																														34.8		50.5		4.6		89.9
Financial assets											4.6										0.6			3.9			0.1			154.6		87.9		4.6		247.1
Financial liabilities:
Interest rate derivatives																														0		167.1		0		167.1
Commodity derivatives																														89.9		25.8		3.7		119.4
Financial liabilities											3.7	3.6			0.1			0												89.9		192.9		3.7		286.5
Unrealized gain (loss) recognized as a component of net income related to level 3 financial assets and liabilities	0.1		0.2
Nonfinancial assets and liabilities [Abstract]
Property, plant and equipment																																						0.5
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]
Balance, beginning of period	0.4		(25.9)
Total gains (losses) included in:
Net income	0.5	[2]	(0.5)	[2]
Other comprehensive income (loss)	0.5		16.2
Settlements	(0.5)		0.8
Transfers out of Level 3	0	[3]	9.8	[3]
Balance, end of period	0.9		0.4
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Financial assets											4.6										0.6			3.9			0.1			154.6		87.9		4.6		247.1
Financial liabilities											3.7	3.6			0.1			0												89.9		192.9		3.7		286.5
Fair Value Measurements, Valuation Techniques												Discounted cash flow			Discounted cash flow			Discounted cash flow			Discounted cash flow			Discounted cash flow			Discounted cash flow
Input description												Forward commodity price			Forward commodity price			Forward commodity price			Forward commodity price			Forward commodity price			Forward commodity price
Fair value inputs, forward commodity price (in dollars per unit)													103.02	104.66		2.11	2.22		1.27	1.33		1.27	1.33		103.02	104.66		2.11	2.22
Segment Reporting Information [Line Items]
Non-cash asset impairment charges	5.4		0						5.1	0.3
Financial Liabilities: [Abstract]
Fixed Rate Debt Principal Amount Fair Value Disclosure					$ 16,190	$ 15,760	$ 14,580	$ 14,330

[1] See Note 7 for information related to our investment in Energy Transfer Equity common units, which trade on the NYSE under ticker symbol "ETE."

[2] There were unrealized gains of $0.1 million and losses of $0.2 million included in these amounts for the three months ended March 31, 2012 and 2011, respectively.

[3] Transfers out of Level 3 into Level 2 during 2011 were primarily due to the change in observability of forward NGL prices.