Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance				$ 50.9				$ (171.7)	$ 50.9		$ (171.7)
Other comprehensive income (loss) for period, before reclassifications									124.9		314.9
Reclassification of losses (gains) to net income during period									(104.4)		(92.3)
Total other comprehensive income (loss) for period									20.5		222.6		$ 108.3
Accumulated Other Comprehensive Income (Loss), Ending balance	$ 71.4				$ 50.9				71.4		50.9		(171.7)
Interest expense									1,243.0		1,096.7		984.6
Revenue	(8,005.3)	$ (7,964.1)	$ (8,276.3)	(8,543.5)	(9,182.3)	$ (9,585.9)	$ (8,467.5)	(9,298.5)	(32,789.2)	[1]	(36,534.2)	[1]	(29,241.5)	[2]
Operating costs and expenses									27,061.8		31,397.3		25,557.5
Total	(1,125.4)	$ (1,044.8)	$ (1,236.5)	(1,280.4)	(1,305.2)	$ (1,334.6)	$ (687.2)	(911.5)	(4,687.1)		(4,238.5)		(2,855.6)
Cash Flow Hedges [Member] | Commodity Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance				152.7				(10.1)	152.7		(10.1)
Other comprehensive income (loss) for period, before reclassifications									44.1		293.2
Reclassification of losses (gains) to net income during period									(141.7)		(130.4)
Total other comprehensive income (loss) for period									(97.6)		162.8
Accumulated Other Comprehensive Income (Loss), Ending balance	55.1				152.7				55.1		152.7		(10.1)
Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance				(104.8)				(165.1)	(104.8)		(165.1)
Other comprehensive income (loss) for period, before reclassifications									81.4		22.2
Reclassification of losses (gains) to net income during period									37.3		38.1
Total other comprehensive income (loss) for period									118.7		60.3
Accumulated Other Comprehensive Income (Loss), Ending balance	13.9				(104.8)				13.9		(104.8)		(165.1)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance				$ 3.0				$ 3.5	3.0		3.5
Other comprehensive income (loss) for period, before reclassifications									(0.6)		(0.5)
Reclassification of losses (gains) to net income during period									0.0		0.0
Total other comprehensive income (loss) for period									(0.6)		(0.5)
Accumulated Other Comprehensive Income (Loss), Ending balance	$ 2.4				$ 3.0				2.4		3.0		$ 3.5
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total									(104.4)		(92.3)
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Revenue									(152.4)		(131.7)
Operating costs and expenses									10.7		1.3
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Interest expense									$ 37.3		$ 38.1

[1] Revenues are accounted for under ASC 606.

[2] Revenues are accounted for under ASC 605.