Segments - Financial Data for Each Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues and other income	$ 1,495.5	$ 1,348.6	$ 1,275.2
Operating and maintenance expenses (exclusive of depreciation shown separately below)	347.3	313.0	279.6
Depreciation expense	203.1	192.5	181.3
General and administrative expenses	26.1	26.2	23.1
Income from equity investments	14.0	7.7	5.3
Interest expense, net	202.2	179.0	149.3
Income tax expense	71.8	37.9	26.6
Adjusted EBITDA	1,145.6	1,025.8	985.0
Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income	1,495.5	1,348.6	1,275.2
Operating and maintenance expenses (exclusive of depreciation shown separately below)	347.3	313.0	279.6
Depreciation expense	203.1	192.5	181.3
General and administrative expenses	16.6	17.5	15.9
Income from equity investments	14.0	7.7	5.3
Adjusted EBITDA	1,145.6	1,025.8	985.0
Capital expenditures	288.5	245.7	231.8
Interest and Other
Segment Reporting Information [Line Items]
General and administrative expenses	9.5	8.7	7.2
Interest expense, net	202.2	179.0	149.3
Income tax expense	71.8	37.9	26.6
Gathering Opco | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income	799.1	730.0	677.9
Operating and maintenance expenses (exclusive of depreciation shown separately below)	203.5	185.3	170.2
Depreciation expense	126.7	115.6	107.4
General and administrative expenses	10.3	10.9	10.7
Adjusted EBITDA	585.3	533.8	497.0
Capital expenditures	270.2	224.5	210.2
Processing and Storage | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income	577.7	501.7	470.8
Operating and maintenance expenses (exclusive of depreciation shown separately below)	112.9	99.0	85.0
Depreciation expense	59.1	59.9	57.7
General and administrative expenses	5.3	5.3	4.3
Income from equity investments	14.0	7.7	5.3
Adjusted EBITDA	473.5	405.1	386.8
Capital expenditures	17.6	11.2	8.8
Terminaling and Export | Operating Segments
Segment Reporting Information [Line Items]
Revenues and other income	118.7	116.9	126.5
Operating and maintenance expenses (exclusive of depreciation shown separately below)	30.9	28.7	24.4
Depreciation expense	17.3	17.0	16.2
General and administrative expenses	1.0	1.3	0.9
Adjusted EBITDA	86.8	86.9	101.2
Capital expenditures	$ 0.7	$ 10.0	$ 12.8