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
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 354.7	$ 304.3
Other income	0.9	0.7
Total revenues	355.6	305.0
Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	349.4	303.4
Third Party
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	5.3	0.9
Oil and Gas Gathering Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	159.3	144.6
Processing and Storage Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	135.4	113.8
Terminaling and Export Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	27.4	25.2
Water Gathering and Disposal Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 27.3	$ 19.8