Segments - Total Assets for Reportable Segments (Detail) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total consolidated assets		$ 4,151.0	$ 3,789.5
Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets		3,558.0	3,451.4
Interest and Other
Segment Reporting Information [Line Items]
Total consolidated assets		593.0	338.1
Gathering Opco | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets		2,299.0	2,138.6
Processing and Storage | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	[1]	1,010.9	1,048.4
Terminaling and Export | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets		$ 248.1	$ 264.4

[1] Includes investment in equity investees of $87.0 million as of December 31, 2024 and $90.2 million as of December 31, 2023.