Segment Information - Revenues and Operating Margin (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Revenues:
Revenues		$ 4,561.5	$ 4,562.4
Sales of Commodities [Member]
Revenues:
Revenues		3,884.4	3,942.4
Fees from Midstream Services [Member]
Revenues:
Revenues		677.1	620.0
Gathering and Processing [Member]
Revenues:
Operating expenses		208.2	188.1
Other segment items	[1]	1,382.6	1,070.3
Operating margin		602.2	556.4
Logistics and Transportation [Member]
Revenues:
Operating expenses		95.5	90.0
Other segment items	[1]	3,458.8	3,330.2
Operating margin		646.7	532.1
Other [Member]
Revenues:
Revenues		(248.8)	(22.1)
Operating margin		(248.8)	(22.1)
Corporate and Eliminations [Member]
Revenues:
Revenues		(1,583.7)	(1,182.6)
Operating Segments [Member]
Revenues:
Revenues		4,810.3	4,584.5
Operating expenses		303.7	278.1
Other segment items	[1]	4,841.4	4,400.5
Operating margin		1,248.9	1,088.5
Operating Segments [Member] | Sales of Commodities [Member]
Revenues:
Revenues		4,133.2	3,964.5
Operating Segments [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		677.1	620.0
Operating Segments [Member] | Gathering and Processing [Member]
Revenues:
Revenues		675.8	686.0
Operating Segments [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]
Revenues:
Revenues		200.7	272.7
Operating Segments [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		475.1	413.3
Operating Segments [Member] | Logistics and Transportation [Member]
Revenues:
Revenues		4,134.5	3,898.5
Operating Segments [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]
Revenues:
Revenues		3,932.5	3,691.8
Operating Segments [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		202.0	206.7
Operating Segments [Member] | Other [Member]
Revenues:
Revenues		(248.8)	(22.1)
Operating Segments [Member] | Other [Member] | Sales of Commodities [Member]
Revenues:
Revenues		(248.8)	(22.1)
Intersegment Eliminations [Member]
Revenues:
Revenues		1,583.7	1,182.6
Intersegment Eliminations [Member] | Sales of Commodities [Member]
Revenues:
Revenues		1,576.4	1,177.9
Intersegment Eliminations [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		7.3	4.7
Intersegment Eliminations [Member] | Gathering and Processing [Member]
Revenues:
Revenues		1,517.2	1,128.8
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]
Revenues:
Revenues		1,517.0	1,131.0
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		0.2	(2.2)
Intersegment Eliminations [Member] | Logistics and Transportation [Member]
Revenues:
Revenues		66.5	53.8
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]
Revenues:
Revenues		59.4	46.9
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		7.1	6.9
Intersegment Eliminations [Member] | Corporate and Eliminations [Member]
Revenues:
Revenues		(1,583.7)	(1,182.6)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Sales of Commodities [Member]
Revenues:
Revenues		(1,576.4)	(1,177.9)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Fees from Midstream Services [Member]
Revenues:
Revenues		(7.3)	(4.7)
Consolidated Revenue [Member]
Revenues:
Revenues		6,394.0	5,767.1
Consolidated Revenue [Member] | Gathering and Processing [Member]
Revenues:
Revenues		2,193.0	1,814.8
Consolidated Revenue [Member] | Logistics and Transportation [Member]
Revenues:
Revenues		$ 4,201.0	$ 3,952.3

[1] “Other segment items” represents Product purchases and fuel.