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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, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | $ 522.1 | $ 479.5 |  | $ 1,147.6 | $ 1,145.5
Depreciation and amortization expense | (211.9) | (204.5) |  | (428.0) | (443.6)
General and administrative expense | (63.7) | (61.5) |  | (125.1) | (121.9)
Impairment of long-lived assets |  |  | $ (2,442.8) |  | (2,442.8)
Interest expense, net | (94.8) | (96.7) |  | (193.2) | (194.7)
Equity earnings (loss) | 12.8 | 14.9 |  | 24.6 | 35.5
Gain (loss) on sale or disposition of business and assets | 0.4 | 0.7 |  | 0.2 |
Write-down of assets | (1.1) |  |  | (4.7) |
Gain (loss) from financing activities | (1.9) | 21.8 |  | (16.6) | 61.1
Other, net | 0.1 | (0.3) |  | 0.1 | (0.8)
Income (loss) before income taxes | 162.0 | 153.9 |  | 404.9 | (1,961.7)
Gathering and Processing [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | 301.2 | 237.2 |  | 576.6 | 492.8
Logistics And Transportation [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | 291.4 | 231.5 |  | 640.1 | 525.5
Other [Member] |  |  |  |  |
Reconciliation of reportable segment operating margin to income (loss) before income taxes: |  |  |  |  |
Operating margin | $ (70.5) | $ 10.8 |  | $ (69.1) | $ 127.2

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