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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 29, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates |  | $ 2,615.1 | $ 2,659.4 | $ 2,677.3 |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates |  | 480.0 | 426.0 | 362.0 |
Unamortized excess cost amounts by business segment: |  |  |  |  |
Unamortized excess cost amounts |  | 40.8 | 42.9 |  |
Equity method investment amortization of excess cost |  | 2.1 | 2.1 | 2.1 |
Forecasted amortization of excess cost amounts - 2019 |  | 2.1 |  |  |
Forecasted amortization of excess cost amounts - 2020 |  | 2.1 |  |  |
Forecasted amortization of excess cost amounts - 2021 |  | 2.1 |  |  |
Forecasted amortization of excess cost amounts - 2022 |  | 2.1 |  |  |
Forecasted amortization of excess cost amounts - 2023 |  | 2.1 |  |  |
Balance Sheet Data: |  |  |  |  |
Current assets |  | 350.2 | 288.8 |  |
Property, plant and equipment, net |  | 5,359.1 | 5,509.7 |  |
Other assets |  | 80.4 | 71.2 |  |
Total assets |  | 5,789.7 | 5,869.7 |  |
Current liabilities |  | 220.6 | 233.5 |  |
Other liabilities |  | 77.9 | 84.8 |  |
Combined equity |  | 5,491.2 | 5,551.4 |  |
Total liabilities and combined equity |  | 5,789.7 | 5,869.7 |  |
Income Statement Data: |  |  |  |  |
Revenues |  | 1,721.3 | 1,509.0 | 1,342.0 |
Operating income |  | 1,074.6 | 925.9 | 786.7 |
Net income |  | 1,069.1 | 929.5 | 781.7 |
NGL Pipelines & Services [Member] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates |  | 117.0 | 73.4 | 61.4 |
Unamortized excess cost amounts by business segment: |  |  |  |  |
Unamortized excess cost amounts |  | $ 21.7 | 22.9 |  |
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 |  | $ 24.1 | 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 |  | $ 28.9 | 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 |  | $ 16.3 | 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 |  | $ 35.6 | 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 |  | $ 337.6 | 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 |  | $ 43.6 | 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 |  | $ 175.9 | 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 | [1] | $ 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 |  | 365.4 | 358.4 | 311.9 |
Unamortized excess cost amounts by business segment: |  |  |  |  |
Unamortized excess cost amounts |  | $ 17.4 | 18.2 |  |
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 |  | $ 1,369.7 | 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 |  | $ 388.7 | 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 |  | $ 109.1 | 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 |  | $ 6.8 | 3.8 | 3.8 |
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 |  | $ 20.1 | 20.8 |  |
Natural Gas Pipelines & Services [Member] | Old Ocean Pipeline, LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest |  | 50.00% |  |  |
Investments in unconsolidated affiliates |  | $ 2.7 | 0.0 |  |
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | [2] | (9.2) | (9.6) | $ (15.1) |
Unamortized excess cost amounts by business segment: |  |  |  |  |
Unamortized excess cost amounts |  | $ 1.7 | 1.8 |  |
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest |  | 50.00% |  |  |
Investments in unconsolidated affiliates |  | $ 59.1 | 60.8 |  |
Petrochemical & Refined Products Services [Member] | Baton Rouge Propylene Concentrator, LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest |  | 30.00% |  |  |
Investments in unconsolidated affiliates |  | $ 3.2 | 4.1 |  |
Petrochemical & Refined Products Services [Member] | Transport 4, LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest |  | 25.00% |  |  |
Investments in unconsolidated affiliates |  | $ 0.5 | $ 0.6 |  |
[1] | In March 2018, we acquired the remaining 50% membership interest in our Delaware Processing joint venture. See Note 12 for information regarding this acquisition.
[2] | Losses are primarily attributable to our investment in Centennial. As a result of a trend in declining earnings, we estimated the fair value of this equity-method investment during each of the last three fiscal years. Our estimates, based on a combination of market and income approaches, indicate that the fair value of this investment remains in excess of its carrying value.

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