Related Party Transactions - Summary of Revenues From Contracts With Customers Including Affiliated Services and Third-party Services on Disaggregated Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 1,491.9	$ 1,346.1	$ 1,273.2
Other income	3.6	2.5	2.0
Total revenues	1,495.5	1,348.6	1,275.2
Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	1,467.8	1,338.1	1,273.2
Third Party
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	24.1	8.0
Oil and Gas Gathering Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	673.4	633.8	600.8
Processing and Storage Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	561.1	496.0	470.8
Terminaling and Export Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	114.8	114.4	124.5
Water Gathering and Disposal Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 118.5	$ 93.9	$ 77.1