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Segments - Total Assets for Reportable Segments (Detail) - USD ($) $ in Millions		Jun. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total consolidated assets		$ 4,423.1	$ 4,151.0
Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets		3,577.0	3,558.0
Interest and Other
Segment Reporting Information [Line Items]
Total consolidated assets		846.1	593.0
Gathering Opco | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets		2,350.6	2,299.0
Processing and Storage | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	[1]	986.5	1,010.9
Terminaling and Export | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets		$ 239.9	$ 248.1
[1] Includes investment in equity investees of $84.8 million as of June 30, 2025 and $87.0 million as of December 31, 2024.

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