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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance				$ (359.0)				$ (370.4)	$ (359.0)	$ (370.4)
Other comprehensive income before reclassifications									161.7	(39.9)
Amounts reclassified from accumulated other comprehensive (income) loss									(44.3)	51.3
Total other comprehensive income (loss)									117.4	11.4	(19.0)
Ending Balance	(241.6)				(359.0)				(241.6)	(359.0)	(370.4)
Interest expense									921.0us-gaap_InterestExpense	802.5us-gaap_InterestExpense	771.8us-gaap_InterestExpense
Revenue	(10,190.3)us-gaap_Revenues	(12,330.2)us-gaap_Revenues	(12,520.8)us-gaap_Revenues	(12,909.9)us-gaap_Revenues	(13,101.3)us-gaap_Revenues	(12,093.3)us-gaap_Revenues	(11,149.3)us-gaap_Revenues	(11,383.1)us-gaap_Revenues	(47,951.2)us-gaap_Revenues	(47,727.0)us-gaap_Revenues	(42,583.1)us-gaap_Revenues
Operating costs and expenses									44,220.5us-gaap_OperatingExpenses	44,238.7us-gaap_OperatingExpenses	39,367.9us-gaap_OperatingExpenses
Total	(681.1)us-gaap_ProfitLoss	(699.2)us-gaap_ProfitLoss	(646.5)us-gaap_ProfitLoss	(806.7)us-gaap_ProfitLoss	(705.7)us-gaap_ProfitLoss	(592.8)us-gaap_ProfitLoss	(553.3)us-gaap_ProfitLoss	(755.3)us-gaap_ProfitLoss	(2,833.5)us-gaap_ProfitLoss	(2,607.1)us-gaap_ProfitLoss	(2,428.0)us-gaap_ProfitLoss
Gains and Losses on Cash Flow Hedges [Member] \| Commodity derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance				(14.7)				10.1	(14.7)	10.1
Other comprehensive income before reclassifications									161.3	(46.9)
Amounts reclassified from accumulated other comprehensive (income) loss									(76.7)	22.1
Total other comprehensive income (loss)									84.6	(24.8)
Ending Balance	69.9				(14.7)				69.9	(14.7)
Gains and Losses on Cash Flow Hedges [Member] \| Interest rate derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance				(347.2)				(383.0)	(347.2)	(383.0)
Other comprehensive income before reclassifications									0	6.6
Amounts reclassified from accumulated other comprehensive (income) loss									32.4	29.2
Total other comprehensive income (loss)									32.4	35.8
Ending Balance	(314.8)				(347.2)				(314.8)	(347.2)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance				2.9				2.5	2.9	2.5
Other comprehensive income before reclassifications									0.4	0.4
Amounts reclassified from accumulated other comprehensive (income) loss									0	0
Total other comprehensive income (loss)									0.4	0.4
Ending Balance	3.3				2.9				3.3	2.9
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total									(44.3)	51.3
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Commodity derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Revenue									(75.0)	22.4
Operating costs and expenses									(1.7)	(0.3)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Interest rate derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Interest expense									$ 32.4	$ 29.2