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Segment Information - Revenues and Operating Margin (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenues:        
Revenues $ 3,562.0 $ 3,403.7 $ 8,124.4 $ 7,924.2
Sales of Commodities [Member]        
Revenues:        
Revenues 2,991.1 2,914.6 6,944.4 6,939.7
Fees from Midstream Services [Member]        
Revenues:        
Revenues 570.9 489.1 1,180.0 984.5
Gathering and Processing [Member]        
Revenues:        
Revenues 1,518.4 1,566.2 3,333.1 3,522.0
Operating margin [1] 572.6 502.5 1,128.9 1,040.9
Logistics and Transportation [Member]        
Revenues:        
Revenues 2,995.9 2,756.1 6,948.3 6,581.5
Operating margin [1] 547.7 408.0 1,079.8 937.1
Other [Member]        
Revenues:        
Revenues (46.6) 151.9 (68.7) 327.7
Operating margin [1] (46.6) 151.9 (68.7) 327.7
Corporate and Eliminations [Member]        
Revenues:        
Revenues (905.7) (1,070.5) (2,088.3) (2,507.0)
Operating Segments [Member]        
Revenues:        
Revenues 3,562.0 3,403.7 8,124.4 7,924.2
Operating Segments [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 2,991.1 2,914.6 6,944.4 6,939.7
Operating Segments [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 570.9 489.1 1,180.0 984.5
Operating Segments [Member] | Gathering and Processing [Member]        
Revenues:        
Revenues 645.6 589.6 1,331.6 1,197.9
Operating Segments [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 254.3 268.0 527.2 555.8
Operating Segments [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 391.3 321.6 804.4 642.1
Operating Segments [Member] | Logistics and Transportation [Member]        
Revenues:        
Revenues 2,963.0 2,662.2 6,861.5 6,398.6
Operating Segments [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 2,783.4 2,494.7 6,485.9 6,056.2
Operating Segments [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 179.6 167.5 375.6 342.4
Operating Segments [Member] | Other [Member]        
Revenues:        
Revenues (46.6) 151.9 (68.7) 327.7
Operating Segments [Member] | Other [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues (46.6) 151.9 (68.7) 327.7
Operating Segments [Member] | Corporate and Eliminations [Member]        
Revenues:        
Revenues     0.0  
Operating Segments [Member] | Corporate and Eliminations [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues     0.0  
Intersegment Eliminations [Member] | Gathering and Processing [Member]        
Revenues:        
Revenues 872.8 976.6 2,001.5 2,324.1
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 872.9 976.0 2,003.5 2,323.0
Intersegment Eliminations [Member] | Gathering and Processing [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues (0.1) 0.6 (2.0) 1.1
Intersegment Eliminations [Member] | Logistics and Transportation [Member]        
Revenues:        
Revenues 32.9 93.9 86.8 182.9
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues 25.8 83.0 72.7 161.2
Intersegment Eliminations [Member] | Logistics and Transportation [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues 7.1 10.9 14.1 21.7
Intersegment Eliminations [Member] | Corporate and Eliminations [Member]        
Revenues:        
Revenues (905.7) (1,070.5) (2,088.3) (2,507.0)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Sales of Commodities [Member]        
Revenues:        
Revenues (898.7) (1,059.0) (2,076.2) (2,484.2)
Intersegment Eliminations [Member] | Corporate and Eliminations [Member] | Fees from Midstream Services [Member]        
Revenues:        
Revenues $ (7.0) $ (11.5) $ (12.1) $ (22.8)
[1] Operating margin is calculated by subtracting Product purchases and fuel and Operating expenses from Revenues.