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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 364.6	$ 323.5	$ 719.3	$ 627.8
Other income	0.9	0.5	1.8	1.2
Total revenues	365.5	324.0	721.1	629.0
Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	358.5	321.9	707.9	625.3
Third Party
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	6.1	1.6	11.4	2.5
Oil and Gas Gathering Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	165.3	152.7	324.6	297.3
Processing and Storage Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	135.2	121.6	270.6	235.4
Terminaling and Export Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	29.6	26.2	57.0	51.4
Water Gathering and Disposal Services | Affiliate
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer including assessed tax	$ 28.4	$ 21.4	$ 55.7	$ 41.2