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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax $ 413.5 $ 364.6 $ 794.5 $ 719.3
Other income 0.7 0.9 1.7 1.8
Total revenues 414.2 365.5 796.2 721.1
Affiliate        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 405.3 358.5 779.6 707.9
Third Party        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 8.2 6.1 14.9 11.4
Oil and Gas Gathering Services | Affiliate        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 185.9 165.3 357.4 324.6
Processing and Storage Services | Affiliate        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 152.3 135.2 295.9 270.6
Terminaling and Export Services | Affiliate        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 33.1 29.6 62.6 57.0
Water Gathering and Disposal Services | Affiliate        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer including assessed tax $ 34.0 $ 28.4 $ 63.7 $ 55.7