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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 2,608.5 |  | $ 2,600.2
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |
Equity in income (loss) of unconsolidated affiliates | 140.8 | $ 154.6 |
NGL Pipelines & Services [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 699.1 |  | 703.8
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |
Equity in income (loss) of unconsolidated affiliates | 32.7 | 30.1 |
Crude Oil Pipelines & Services [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 1,877.5 |  | 1,866.5
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |
Equity in income (loss) of unconsolidated affiliates | 107.3 | 124.6 |
Natural Gas Pipelines & Services [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 27.9 |  | 27.3
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |
Equity in income (loss) of unconsolidated affiliates | 1.6 | 1.7 |
Petrochemical & Refined Products Services [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 4.0 |  | $ 2.6
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |
Equity in income (loss) of unconsolidated affiliates | $ (0.8) | $ (1.8) |

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