v3.26.1
Segments - Financial Data for Each Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenues and other income $ 390.1 $ 382.0
Operating and maintenance expenses (exclusive of depreciation shown separately below) 85.6 85.6
Depreciation expense 58.5 51.5
General and administrative expenses 7.9 7.5
Income from equity investments 3.2 3.4
Interest expense, net 55.4 56.4
Income tax expense 28.2 23.0
Adjusted EBITDA 301.9 294.8
Operating Segments    
Segment Reporting Information [Line Items]    
Revenues and other income 390.1 382.0
Operating and maintenance expenses (exclusive of depreciation shown separately below) 85.6 85.6
Depreciation expense 58.5 51.5
General and administrative expenses 5.8 5.0
Income from equity investments 3.2 3.4
Interest expense, net 0.0 0.0
Income tax expense 0.0 0.0
Adjusted EBITDA 301.9 294.8
Capital expenditures 10.4 50.1
Interest and Other    
Segment Reporting Information [Line Items]    
Revenues and other income 0.0 0.0
Operating and maintenance expenses (exclusive of depreciation shown separately below) 0.0 0.0
Depreciation expense 0.0 0.0
General and administrative expenses 2.1 2.5
Income from equity investments 0.0 0.0
Interest expense, net 55.4 56.4
Income tax expense 28.2 23.0
Gathering Opco | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues and other income 204.1 203.6
Operating and maintenance expenses (exclusive of depreciation shown separately below) 49.7 50.4
Depreciation expense 37.7 32.4
General and administrative expenses 4.1 3.0
Income from equity investments 0.0 0.0
Interest expense, net 0.0 0.0
Income tax expense 0.0 0.0
Adjusted EBITDA 150.3 150.2
Capital expenditures 5.8 47.7
Processing and Storage | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues and other income 148.4 147.8
Operating and maintenance expenses (exclusive of depreciation shown separately below) 29.3 27.7
Depreciation expense 16.4 14.7
General and administrative expenses 1.4 1.7
Income from equity investments 3.2 3.4
Interest expense, net 0.0 0.0
Income tax expense 0.0 0.0
Adjusted EBITDA 120.9 121.8
Capital expenditures 4.6 2.4
Terminaling and Export | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues and other income 37.6 30.6
Operating and maintenance expenses (exclusive of depreciation shown separately below) 6.6 7.5
Depreciation expense 4.4 4.4
General and administrative expenses 0.3 0.3
Income from equity investments 0.0 0.0
Interest expense, net 0.0 0.0
Income tax expense 0.0 0.0
Adjusted EBITDA 30.7 22.8
Capital expenditures $ 0.0 $ 0.0