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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Depreciation and amortization expense |  | $ (348.6) | $ (332.1) | $ (689.1) | $ (656.9)
General and administrative expense |  | (98.3) | (81.0) | (184.8) | (163.4)
Other operating income (expense) |  | 0.2 |  | 0.3 | 0.6
Interest expense, net |  | (176.0) | (166.6) | (404.6) | (334.7)
Equity earnings (loss) |  | 2.9 | 3.4 | 5.6 | 3.2
Gain (loss) from financing activities |  | (0.8) |  | (0.8) | 0.0
Other, net |  | 0.1 | (2.2) | 2.1 | (5.1)
Income (loss) before income taxes |  | 453.2 | 483.9 | 868.7 | 1,149.4
Gathering and Processing [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | [1] | 572.6 | 502.5 | 1,128.9 | 1,040.9
Logistics and Transportation [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | [1] | 547.7 | 408.0 | 1,079.8 | 937.1
Other [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | [1] | $ (46.6) | $ 151.9 | $ (68.7) | $ 327.7
[1] | Operating margin is calculated by subtracting Product purchases and fuel and Operating expenses from Revenues.

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