v3.26.1
Related Party Transactions - Summary of Revenues From Contracts With Customers Including Affiliated Services and Third-party Services on Disaggregated Basis (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax $ 397.7 $ 413.5 $ 786.4 $ 794.5
Other income 1.3 0.7 2.7 1.7
Total revenues 399.0 414.2 789.1 796.2
Affiliate        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 379.8 405.3 752.9 779.6
Affiliate | Oil and Gas Gathering Services        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 171.2 185.9 337.5 357.4
Affiliate | Processing and Storage Services        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 140.1 152.3 279.2 295.9
Affiliate | Terminaling and Export Services        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 36.5 33.1 72.6 62.6
Affiliate | Water Gathering and Disposal Services        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 32.0 34.0 63.6 63.7
Third Party        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax $ 17.9 $ 8.2 $ 33.5 $ 14.9