Segment Information - Revenues and Operating Margin (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Revenues		$ 3,403.7	$ 6,055.8	$ 7,924.2	$ 11,014.9
Sales of Commodities [Member]
Revenues:
Revenues		2,914.6	5,624.2	6,939.7	10,190.3
Fees from Midstream Services [Member]
Revenues:
Revenues		489.1	431.6	984.5	824.6
Gathering and Processing [Member]
Revenues:
Revenues		1,566.2	3,169.6	3,522.0	5,545.6
Operating margin	[1]	502.5	474.7	1,040.9	872.3
Logistics and Transportation [Member]
Revenues:
Revenues		2,756.1	5,690.4	6,581.5	10,617.4
Operating margin	[1]	408.0	322.3	937.1	674.5
Other [Member]
Revenues:
Revenues		151.9	(4.5)	327.7	(182.7)
Operating margin	[1]	151.9	(4.5)	327.7	(182.7)
Corporate and Eliminations [Member]
Revenues:
Revenues		(1,070.5)	(2,799.7)	(2,507.0)	(4,965.4)
Operating Segments [Member]
Revenues:
Revenues		3,403.7	6,055.8	7,924.2	11,014.9
Operating Segments [Member] | Sales of Commodities [Member]
Revenues:
Revenues		2,914.6	5,624.2	6,939.7	10,190.3
Operating Segments [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		489.1	431.6	984.5	824.6
Operating Segments [Member] | Gathering and Processing [Member]
Revenues:
Revenues		589.6	513.5	1,197.9	858.6
Operating Segments [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]
Revenues:
Revenues		268.0	261.9	555.8	396.4
Operating Segments [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		321.6	251.6	642.1	462.2
Operating Segments [Member] | Logistics and Transportation [Member]
Revenues:
Revenues		2,662.2	5,546.8	6,398.6	10,339.0
Operating Segments [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]
Revenues:
Revenues		2,494.7	5,366.8	6,056.2	9,976.6
Operating Segments [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		167.5	180.0	342.4	362.4
Operating Segments [Member] | Other [Member]
Revenues:
Revenues		151.9	(4.5)	327.7	(182.7)
Operating Segments [Member] | Other [Member] | Sales of Commodities [Member]
Revenues:
Revenues		151.9	(4.5)	327.7	(182.7)
Intersegment Eliminations [Member] | Gathering and Processing [Member]
Revenues:
Revenues		976.6	2,656.1	2,324.1	4,687.0
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]
Revenues:
Revenues		976.0	2,656.6	2,323.0	4,687.2
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		0.6	0.5	1.1	(0.2)
Intersegment Eliminations [Member] | Logistics and Transportation [Member]
Revenues:
Revenues		93.9	143.6	182.9	278.4
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]
Revenues:
Revenues		83.0	131.6	161.2	255.8
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		10.9	12.0	21.7	22.6
Intersegment Eliminations [Member] | Corporate and Eliminations [Member]
Revenues:
Revenues		(1,070.5)	(2,799.7)	(2,507.0)	(4,965.4)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Sales of Commodities [Member]
Revenues:
Revenues		(1,059.0)	(2,788.2)	(2,484.2)	(4,943.0)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		$ (11.5)	$ (11.5)	$ (22.8)	$ (22.4)

[1] Operating margin is calculated by subtracting Product purchases and fuel and Operating expenses from Revenues.