v3.26.1
Segments - Total Assets for Reportable Segments (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Segment Reporting Information [Line Items]    
Total consolidated assets $ 4,256.6 $ 4,388.3
Operating Segments    
Segment Reporting Information [Line Items]    
Total consolidated assets 3,535.7 3,607.3
Interest and Other    
Segment Reporting Information [Line Items]    
Total consolidated assets 720.9 781.0
Gathering Opco | Operating Segments    
Segment Reporting Information [Line Items]    
Total consolidated assets 2,374.2 2,413.7
Processing and Storage | Operating Segments    
Segment Reporting Information [Line Items]    
Total consolidated assets [1] 936.6 962.8
Terminaling and Export | Operating Segments    
Segment Reporting Information [Line Items]    
Total consolidated assets $ 224.9 $ 230.8
[1] Includes investment in equity investees of $83.2 million as of June 30, 2026 and $81.5 million as of December 31, 2025.