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Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 5,239.3 $ 5,117.2
Accumulated depreciation (1,894.6) (1,791.8)
Property, plant and equipment, net 3,344.7 3,325.4
Logistics Facilities and Railcars    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 410.8 409.8
Logistics Facilities and Railcars | Minimum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 20 years  
Logistics Facilities and Railcars | Maximum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 25 years  
Storage Facilities    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 19.9 19.9
Storage Facilities | Minimum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 20 years  
Storage Facilities | Maximum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 25 years  
Other    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 40.8 39.0
Other | Minimum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 20 years  
Other | Maximum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 25 years  
Construction-In-Progress    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 313.3 250.1
Gathering Assets | Pipelines    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 22 years  
Total property, plant and equipment, at cost $ 1,817.1 1,782.7
Gathering Assets | Compressors, Pumping Stations and Terminals    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 1,123.6 1,109.1
Gathering Assets | Compressors, Pumping Stations and Terminals | Minimum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 22 years  
Gathering Assets | Compressors, Pumping Stations and Terminals | Maximum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 25 years  
Gas Plant Assets | Pipelines, Pipes and Valves    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 460.0 460.0
Gas Plant Assets | Pipelines, Pipes and Valves | Minimum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 22 years  
Gas Plant Assets | Pipelines, Pipes and Valves | Maximum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 25 years  
Gas Plant Assets | Equipment    
Property Plant And Equipment [Line Items]    
Total property, plant and equipment, at cost $ 428.2 428.2
Gas Plant Assets | Equipment | Minimum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 12 years  
Gas Plant Assets | Equipment | Maximum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 30 years  
Gas Plant Assets | Processing and Fractionation Facilities    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 25 years  
Total property, plant and equipment, at cost $ 443.3 436.1
Gas Plant Assets | Buildings    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Estimated useful life 35 years  
Total property, plant and equipment, at cost $ 182.3 $ 182.3