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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | $ 2,669.4 |  | $ 2,669.4 |  | $ 2,628.5
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 76.4 | $ 110.2 | 177.5 | $ 199.4 |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |
Unamortized excess cost amounts | 45.8 |  | 45.8 |  | 46.9
Equity method investment amortization of excess cost | 0.6 | 1.3 | 1.1 | 3.9 |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Revenues | 317.5 | 403.7 | 663.0 | 753.2 |
Operating income | 181.7 | 240.7 | 395.4 | 437.3 |
Net income | 178.3 | 237.7 | 393.5 | 431.1 |
NGL Pipelines & Services [Member] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 14.0 | 12.5 | 29.1 | 24.1 |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |
Unamortized excess cost amounts | $ 24.7 |  | $ 24.7 |  | 25.3
NGL Pipelines & Services [Member] | Venice Energy Service Company, L.L.C. [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 13.10% |  | 13.10% |  |
Investments in unconsolidated affiliates | $ 25.4 |  | $ 25.4 |  | 25.9
NGL Pipelines & Services [Member] | K/D/S Promix, L.L.C. [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 38.3 |  | $ 38.3 |  | 38.3
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 32.20% |  | 32.20% |  |
Investments in unconsolidated affiliates | $ 17.4 |  | $ 17.4 |  | 18.5
NGL Pipelines & Services [Member] | Skelly-Belvieu Pipeline Company, L.L.C. [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 39.2 |  | $ 39.2 |  | 39.8
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 35.00% |  | 35.00% |  |
Investments in unconsolidated affiliates | $ 335.3 |  | $ 335.3 |  | 342.0
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 45.00% |  | 45.00% |  |
Investments in unconsolidated affiliates | $ 36.4 |  | $ 36.4 |  | 36.8
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 33.30% |  | 33.30% |  |
Investments in unconsolidated affiliates | $ 170.4 |  | $ 170.4 |  | 171.2
NGL Pipelines & Services [Member] | Delaware Basin Gas Processing LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 83.3 |  | $ 83.3 |  | 46.2
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | 65.8 | 79.4 | 155.9 | 139.3 |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |
Unamortized excess cost amounts | $ 18.9 |  | $ 18.9 |  | 19.3
Crude Oil Pipelines & Services [Member] | Seaway Crude Pipeline Company LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 1,400.1 |  | $ 1,400.1 |  | 1,396.0
Crude Oil Pipelines & Services [Member] | Eagle Ford Pipeline LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 382.6 |  | $ 382.6 |  | 388.8
Crude Oil Pipelines & Services [Member] | Eagle Ford Terminals Corpus Christi LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 44.5 |  | $ 44.5 |  | 28.6
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ 0.9 | 1.0 | $ 1.9 | 1.9 |
Natural Gas Pipelines & Services [Member] | White River Hub, LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 22.0 |  | $ 22.0 |  | 22.5
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | (4.3) | (3.7) | (9.4) | (7.1) |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |
Unamortized excess cost amounts | $ 2.2 |  | $ 2.2 |  | 2.3
Petrochemical & Refined Products Services [Member] | Baton Rouge Propylene Concentrator, LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 30.00% |  | 30.00% |  |
Investments in unconsolidated affiliates | $ 5.0 |  | $ 5.0 |  | 5.4
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest (in hundredths) | 50.00% |  | 50.00% |  |
Investments in unconsolidated affiliates | $ 63.2 |  | $ 63.2 |  | 65.6
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments in unconsolidated affiliates | 6.3 |  | 6.3 |  | $ 2.9
Offshore Pipelines & Services [Member] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates | $ 0.0 | $ 21.0 | $ 0.0 | $ 41.2 |

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- Definition If the price paid to acquire an ownership interest exceeded the underlying book value of the capital accounts acquired, such excess cost amounts are included within the carrying values of the investments. These costs were attributable to the underlying tangible and amortizable intangible assets of certain unconsolidated affiliates, and are amortized as a reduction in equity earnings in a manner similar to depreciation. This represents the amortization of such excess cost amounts for the period. + References No definition available. + Details
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