Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance	$ (241.6)	$ (359.0)
Other comprehensive income before reclassifications	30.8	(9.2)
Amounts reclassified from accumulated other comprehensive loss (income)	(52.4)	23.9
Total other comprehensive income (loss)	(21.6)	14.7
Ending Balance	(263.2)	(344.3)
Interest expense	239.1us-gaap_InterestExpense	220.9us-gaap_InterestExpense
Revenue	(7,472.5)us-gaap_SalesRevenueNet	(12,909.9)us-gaap_SalesRevenueNet
Operating costs and expenses	6,616.4us-gaap_OperatingExpenses	11,880.5us-gaap_OperatingExpenses
Total	(650.6)us-gaap_ProfitLoss	(806.7)us-gaap_ProfitLoss
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
Amounts reclassified from accumulated other comprehensive loss (income)	8.7	7.9
Total other comprehensive income (loss)	8.7	7.9
Ending Balance	(306.1)	(339.3)
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	30.8	(9.2)
Amounts reclassified from accumulated other comprehensive loss (income)	(61.1)	16.0
Total other comprehensive income (loss)	(30.3)	6.8
Ending Balance	39.6	(7.9)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance	3.3	2.9
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss (income)	0	0
Total other comprehensive income (loss)	0	0
Ending Balance	3.3	2.9
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total	(52.4)	23.9
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	7.9
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	(61.1)	16.9
Operating costs and expenses	$ 0	$ (0.9)

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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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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