Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance	$ (280.0)	$ (219.2)
Other comprehensive income (loss) before reclassifications	147.1	(1.3)
Amounts reclassified from accumulated other comprehensive loss (income)	16.7	(48.0)
Total other comprehensive income (loss)	163.8	(49.3)
Ending Balance	(116.2)	(268.5)
Interest expense	249.3	240.6
Revenue	(7,320.4)	(5,005.3)
Operating costs and expenses	6,333.2	4,146.9
Total	(771.0)	(670.2)
Gains and Losses on Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance	(199.8)	(279.5)
Other comprehensive income (loss) before reclassifications	2.4	0.0
Amounts reclassified from accumulated other comprehensive loss (income)	9.6	9.2
Total other comprehensive income (loss)	12.0	9.2
Ending Balance	(187.8)	(270.3)
Gains and Losses on Cash Flow Hedges [Member] | Commodity Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance	(83.8)	56.6
Other comprehensive income (loss) before reclassifications	144.8	(1.2)
Amounts reclassified from accumulated other comprehensive loss (income)	7.1	(57.2)
Total other comprehensive income (loss)	151.9	(58.4)
Ending Balance	68.1	(1.8)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Beginning Balance	3.6	3.7
Other comprehensive income (loss) before reclassifications	(0.1)	(0.1)
Amounts reclassified from accumulated other comprehensive loss (income)	0.0	0.0
Total other comprehensive income (loss)	(0.1)	(0.1)
Ending Balance	3.5	3.6
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total	16.7	(48.0)
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Gains and Losses on Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Interest expense	9.6	9.2
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Gains and Losses on Cash Flow Hedges [Member] | Commodity Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Revenue	7.5	(58.8)
Operating costs and expenses	$ (0.4)	$ 1.6