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Segment Information - Revenues and Operating Margin (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenues:        
Revenues $ 3,851.8 $ 3,896.6 $ 11,976.2 $ 11,820.8
Sales of Commodities [Member]        
Revenues:        
Revenues 3,217.0 3,374.3 10,126.2 10,314.0
Fees from Midstream Services [Member]        
Revenues:        
Revenues 634.8 522.3 1,850.0 1,506.8
Gathering and Processing [Member]        
Revenues:        
Revenues 1,566.7 1,868.1 4,899.7 5,390.3
Operating margin [1] 584.3 505.0 1,713.4 1,545.9
Logistics and Transportation [Member]        
Revenues:        
Revenues 3,224.4 3,421.9 10,172.6 10,002.8
Operating margin [1] 619.2 457.4 1,699.0 1,394.4
Other [Member]        
Revenues:        
Revenues (17.7) (33.5) (86.3) 294.3
Operating margin [1] (17.7) (33.5) (86.3) 294.3
Corporate and Eliminations [Member]        
Revenues:        
Revenues (921.6) (1,359.9) (3,009.8) (3,866.6)
Operating Segments [Member]        
Revenues:        
Revenues 3,851.8 3,896.6 11,976.2 11,820.8
Operating Segments [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 3,217.0 3,374.3 10,126.2 10,314.0
Operating Segments [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 634.8 522.3 1,850.0 1,506.8
Operating Segments [Member] | Gathering and Processing [Member]        
Revenues:        
Revenues 679.7 568.7 2,011.2 1,766.8
Operating Segments [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 247.8 231.3 774.7 787.1
Operating Segments [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 431.9 337.4 1,236.5 979.7
Operating Segments [Member] | Logistics and Transportation [Member]        
Revenues:        
Revenues 3,189.8 3,361.4 10,051.3 9,759.7
Operating Segments [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 2,986.9 3,176.5 9,437.8 9,232.6
Operating Segments [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 202.9 184.9 613.5 527.1
Operating Segments [Member] | Other [Member]        
Revenues:        
Revenues (17.7) (33.5) (86.3) 294.3
Operating Segments [Member] | Other [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues (17.7) (33.5) (86.3) 294.3
Intersegment Eliminations [Member] | Gathering and Processing [Member]        
Revenues:        
Revenues 887.0 1,299.4 2,888.5 3,623.5
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 884.7 1,298.8 2,888.2 3,621.8
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 2.3 0.6 0.3 1.7
Intersegment Eliminations [Member] | Logistics and Transportation [Member]        
Revenues:        
Revenues 34.6 60.5 121.3 243.1
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 27.8 49.0 100.5 210.2
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 6.8 11.5 20.8 32.9
Intersegment Eliminations [Member] | Corporate and Eliminations [Member]        
Revenues:        
Revenues (921.6) (1,359.9) (3,009.8) (3,866.6)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues (912.5) (1,347.8) (2,988.7) (3,832.0)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues $ (9.1) $ (12.1) $ (21.1) $ (34.6)
[1] Operating margin is calculated by subtracting Product purchases and fuel and Operating expenses from Revenues.