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Segment Information - Reconciliation of Reportable Segment Operating Margin to Income (Loss) Before Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Depreciation and amortization expense |  | $ (355.4) | $ (331.3) | $ (1,044.5) | $ (988.2)
General and administrative expense |  | (102.6) | (90.0) | (287.4) | (253.4)
Other operating income (expense) |  | 0.4 | (2.5) | 0.7 | (2.0)
Interest expense, net |  | (184.9) | (175.1) | (589.5) | (509.8)
Equity earnings (loss) |  | 2.2 | 3.0 | 7.9 | 6.2
Gain (loss) from financing activities |  |  |  | (0.8) | 0.0
Other, net |  | (0.4) | (0.1) | 1.1 | (5.0)
Income (loss) before income taxes |  | 545.1 | 332.9 | 1,413.6 | 1,482.4
Gathering and Processing [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | [1] | 584.3 | 505.0 | 1,713.4 | 1,545.9
Logistics and Transportation [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | [1] | 619.2 | 457.4 | 1,699.0 | 1,394.4
Other [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | [1] | $ (17.7) | $ (33.5) | $ (86.3) | $ 294.3
[1] | Operating margin is calculated by subtracting Product purchases and fuel and Operating expenses from Revenues.

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