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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 29, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in unconsolidated affiliates | $ 2,583.4 |  |  | $ 2,659.4
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 115.7 | $ 94.8 |  |
Income Statement Data: |  |  |  |
Revenues | 396.0 | 343.2 |  |
Operating income | 243.7 | 203.7 |  |
Net income | 242.3 | 202.9 |  |
NGL Pipelines & Services [Member] |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ 19.4 | 15.5 |  |
NGL Pipelines & Services [Member] | Venice Energy Service Company, L.L.C. [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 13.10% |  |  |
Investments in unconsolidated affiliates | $ 24.6 |  |  | 25.7
NGL Pipelines & Services [Member] | K/D/S Promix, L.L.C. [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 50.00% |  |  |
Investments in unconsolidated affiliates | $ 29.6 |  |  | 30.9
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 32.20% |  |  |
Investments in unconsolidated affiliates | $ 16.8 |  |  | 17.0
NGL Pipelines & Services [Member] | Skelly-Belvieu Pipeline Company, L.L.C. [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 50.00% |  |  |
Investments in unconsolidated affiliates | $ 36.4 |  |  | 37.0
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 35.00% |  |  |
Investments in unconsolidated affiliates | $ 310.5 |  |  | 314.4
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 45.00% |  |  |
Investments in unconsolidated affiliates | $ 35.7 |  |  | 35.9
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 33.30% |  |  |
Investments in unconsolidated affiliates | $ 164.5 |  |  | 165.7
NGL Pipelines & Services [Member] | Delaware Basin Gas Processing LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 100.00% |  |  |
Investments in unconsolidated affiliates | $ 0.0 |  |  | 107.3
Remaining membership interest acquired |  |  | 50.00% |
Crude Oil Pipelines & Services [Member] |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ 97.9 | 81.2 |  |
Crude Oil Pipelines & Services [Member] | Seaway Crude Pipeline Company LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 50.00% |  |  |
Investments in unconsolidated affiliates | $ 1,392.3 |  |  | 1,378.9
Crude Oil Pipelines & Services [Member] | Eagle Ford Pipeline LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 50.00% |  |  |
Investments in unconsolidated affiliates | $ 387.8 |  |  | 385.2
Crude Oil Pipelines & Services [Member] | Eagle Ford Terminals Corpus Christi LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 50.00% |  |  |
Investments in unconsolidated affiliates | $ 92.4 |  |  | 75.1
Natural Gas Pipelines & Services [Member] |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ 1.0 | 1.0 |  |
Natural Gas Pipelines & Services [Member] | White River Hub, LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 50.00% |  |  |
Investments in unconsolidated affiliates | $ 20.6 |  |  | 20.8
Petrochemical & Refined Products Services [Member] |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ (2.6) | $ (2.9) |  |
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest | 50.00% |  |  |
Investments in unconsolidated affiliates | $ 57.9 |  |  | 60.8
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in unconsolidated affiliates | $ 14.3 |  |  | $ 4.7

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