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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | $ 2,485.4 |  | $ 2,485.4 |  | $ 2,600.2
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 82.0 | $ 139.3 | 336.1 | $ 431.3 |
NGL Pipelines & Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 676.4 |  | 676.4 |  | 703.8
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 29.3 | 25.9 | 90.8 | 82.7 |
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 1,774.8 |  | 1,774.8 |  | 1,866.5
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 51.8 | 113.2 | 243.2 | 348.8 |
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 29.9 |  | 29.9 |  | 27.3
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 1.4 | 1.6 | 4.3 | 4.9 |
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 4.3 |  | 4.3 |  | $ 2.6
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ (0.5) | $ (1.4) | $ (2.2) | $ (5.1) |

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