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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance			$ (241.6)	$ (359.0)
Other comprehensive income before reclassifications			26.9	(42.0)
Amounts reclassified from accumulated other comprehensive loss (income)			(63.9)	46.8
Total other comprehensive income (loss)	$ (15.4)	$ (9.9)	(37.0)	4.8
Ending Balance	(278.6)	(354.2)	(278.6)	(354.2)
Interest expense	240.4	228.9	479.5	449.8
Revenue	(7,092.5)	(12,520.8)	(14,565.0)	(25,430.7)
Operating costs and expenses	6,357.5	11,639.1	12,973.9	23,519.6
Total	(556.6)	(646.5)	(1,207.2)	(1,453.2)
Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance			(314.8)	(347.2)
Other comprehensive income before reclassifications			0.0	0.0
Amounts reclassified from accumulated other comprehensive loss (income)			17.4	15.9
Total other comprehensive income (loss)			17.4	15.9
Ending Balance	(297.4)	(331.3)	(297.4)	(331.3)
Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance			69.9	(14.7)
Other comprehensive income before reclassifications			26.5	(42.0)
Amounts reclassified from accumulated other comprehensive loss (income)			(81.3)	30.9
Total other comprehensive income (loss)			(54.8)	(11.1)
Ending Balance	15.1	(25.8)	15.1	(25.8)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance			3.3	2.9
Other comprehensive income before reclassifications			0.4	0.0
Amounts reclassified from accumulated other comprehensive loss (income)			0.0	0.0
Total other comprehensive income (loss)			0.4	0.0
Ending Balance	3.7	2.9	3.7	2.9
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total	(11.5)	22.9	(63.9)	46.8
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Interest expense	8.7	8.0	17.4	15.9
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Revenue	(20.7)	15.4	(81.8)	32.3
Operating costs and expenses	$ 0.5	$ (0.5)	$ 0.5	$ (1.4)

X

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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