Segment Information - Revenues and Operating Margin (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Revenues:
Revenues		$ 4,520.5	$ 4,959.1
Sales of Commodities [Member]
Revenues:
Revenues		4,025.0	4,566.2
Fees from Midstream Services [Member]
Revenues:
Revenues		495.5	392.9
Gathering and Processing [Member]
Revenues:
Revenues		1,955.8	2,375.9
Operating margin	[1]	538.4	397.6
Logistics and Transportation [Member]
Revenues:
Revenues		3,825.4	4,927.5
Operating margin	[1]	529.1	352.1
Other [Member]
Revenues:
Revenues		175.8	(178.3)
Operating margin	[1]	175.8	(178.3)
Corporate and Eliminations [Member]
Revenues:
Revenues		(1,436.5)	(2,166.0)
Operating Segments [Member]
Revenues:
Revenues		4,520.5	4,959.1
Operating Segments [Member] | Sales of Commodities [Member]
Revenues:
Revenues		4,025.0	4,566.2
Operating Segments [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		495.5	392.9
Operating Segments [Member] | Gathering and Processing [Member]
Revenues:
Revenues		608.3	345.0
Operating Segments [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]
Revenues:
Revenues		287.9	134.6
Operating Segments [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		320.4	210.4
Operating Segments [Member] | Logistics and Transportation [Member]
Revenues:
Revenues		3,736.4	4,792.4
Operating Segments [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]
Revenues:
Revenues		3,561.3	4,609.9
Operating Segments [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		175.1	182.5
Operating Segments [Member] | Other [Member]
Revenues:
Revenues		175.8	(178.3)
Operating Segments [Member] | Other [Member] | Sales of Commodities [Member]
Revenues:
Revenues		175.8	(178.3)
Intersegment Eliminations [Member] | Gathering and Processing [Member]
Revenues:
Revenues		1,347.5	2,030.9
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]
Revenues:
Revenues		1,347.0	2,030.6
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		0.5	0.3
Intersegment Eliminations [Member] | Logistics and Transportation [Member]
Revenues:
Revenues		89.0	135.1
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]
Revenues:
Revenues		78.2	124.3
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		10.8	10.8
Intersegment Eliminations [Member] | Corporate and Eliminations [Member]
Revenues:
Revenues		(1,436.5)	(2,166.0)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Sales of Commodities [Member]
Revenues:
Revenues		(1,425.2)	(2,154.9)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		$ (11.3)	$ (11.1)

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