Equity and Distributions, Reclassfications out of Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 195.9	$ 186.5
Revenues	(11,383.1)	(11,252.5)
Operating costs and expenses	10,420.4	10,467.2
Total	(755.3)	(655.5)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total	13.2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	5.9
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	7.7
Operating costs and expenses	$ (0.4)