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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | $ 2,433.4 |  | $ 2,433.4 |  | $ 2,429.2
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 137.6 | $ 82.0 | 447.2 | $ 336.1 |
NGL Pipelines & Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 656.4 |  | 656.4 |  | 671.6
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 30.5 | 29.3 | 87.5 | 90.8 |
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 1,742.1 |  | 1,742.1 |  | 1,723.7
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 105.2 | 51.8 | 354.2 | 243.2 |
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 32.1 |  | 32.1 |  | 31.4
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 1.4 | 1.4 | 4.3 | 4.3 |
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 2.8 |  | 2.8 |  | $ 2.5
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ 0.5 | $ (0.5) | $ 1.2 | $ (2.2) |

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