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Segments - Financial Data for Each Reportable Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Revenues and other income | $ 365.5 | $ 324.0 | $ 721.1 | $ 629.0
Operating and maintenance expenses (exclusive of depreciation shown separately below) | 87.5 | 73.1 | 165.6 | 135.6
Depreciation expense | 50.5 | 47.0 | 100.3 | 94.4
General and administrative expenses | 5.2 | 5.8 | 10.9 | 12.2
Income from equity investments | 3.7 | 1.7 | 6.4 | 3.3
Interest expense, net | 49.7 | 43.8 | 98.2 | 85.4
Income tax expense | 16.0 | 8.1 | 30.3 | 14.6
Adjusted EBITDA | 278.2 | 248.8 | 554.9 | 489.0
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues and other income | 365.5 | 324.0 | 721.1 | 629.0
Operating and maintenance expenses (exclusive of depreciation shown separately below) | 87.5 | 73.1 | 165.6 | 135.6
Depreciation expense | 50.5 | 47.0 | 100.3 | 94.4
General and administrative expenses | 3.5 | 3.8 | 7.0 | 7.7
Income from equity investments | 3.7 | 1.7 | 6.4 | 3.3
Adjusted EBITDA | 278.2 | 248.8 | 554.9 | 489.0
Capital expenditures | 72.7 | 52.1 | 107.9 | 109.4
Interest and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expenses | 1.7 | 2.0 | 3.9 | 4.5
Interest expense, net | 49.7 | 43.8 | 98.2 | 85.4
Income tax expense | 16.0 | 8.1 | 30.3 | 14.6
Gathering Opco | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues and other income | 195.5 | 174.5 | 383.6 | 339.2
Operating and maintenance expenses (exclusive of depreciation shown separately below) | 50.8 | 43.8 | 97.1 | 82.2
Depreciation expense | 31.5 | 28.2 | 62.3 | 57.0
General and administrative expenses | 2.3 | 2.5 | 4.4 | 4.9
Adjusted EBITDA | 142.4 | 128.2 | 282.1 | 252.1
Capital expenditures | 69.5 | 46.4 | 101.2 | 95.8
Processing and Storage | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues and other income | 139.5 | 122.8 | 278.6 | 237.2
Operating and maintenance expenses (exclusive of depreciation shown separately below) | 27.3 | 23.8 | 52.5 | 44.0
Depreciation expense | 14.6 | 14.5 | 29.3 | 29.0
General and administrative expenses | 1.0 | 1.1 | 2.2 | 2.3
Income from equity investments | 3.7 | 1.7 | 6.4 | 3.3
Adjusted EBITDA | 114.9 | 99.6 | 230.3 | 194.2
Capital expenditures | 3.2 | 2.7 | 6.6 | 3.6
Terminaling and Export | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues and other income | 30.5 | 26.7 | 58.9 | 52.6
Operating and maintenance expenses (exclusive of depreciation shown separately below) | 9.4 | 5.5 | 16.0 | 9.4
Depreciation expense | 4.4 | 4.3 | 8.7 | 8.4
General and administrative expenses | 0.2 | 0.2 | 0.4 | 0.5
Adjusted EBITDA | $ 20.9 | 21.0 | 42.5 | 42.7
Capital expenditures |  | $ 3.0 | $ 0.1 | $ 10.0

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