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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates |  | $ 2,625.3 |  | $ 2,625.3 |  |  | $ 3,042.0
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |  |  |
Equity in income of unconsolidated affiliates |  | 103.1 | $ 72.3 | 302.5 | $ 179.1 |  |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |  |  |
Unamortized excess cost amounts |  | 48.9 |  | 48.9 |  |  | 59.6
Equity method investment amortization of excess cost |  | 0.6 | 0.7 | 4.5 | 2.3 |  |
NGL Pipelines & Services [Member] |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |  |  |
Equity in income of unconsolidated affiliates |  | 18.9 | 11.7 | 43.0 | 19.2 |  |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |  |  |
Unamortized excess cost amounts |  | 25.6 |  | 25.6 |  |  | 26.5
Equity method investment amortization of excess cost |  | $ 0.3 | 0.2 | $ 0.9 | 0.9 |  |
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% |  |  |
Total investments in unconsolidated affiliates |  | $ 26.4 |  | $ 26.4 |  |  | 27.7
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% |  |  |
Total investments in unconsolidated affiliates |  | $ 42.8 |  | $ 42.8 |  |  | 38.5
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership Interest (in hundredths) |  | 32.20% |  | 32.20% |  |  |
Total investments in unconsolidated affiliates |  | $ 18.4 |  | $ 18.4 |  |  | 18.8
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% |  |  |
Total investments in unconsolidated affiliates |  | $ 40.3 |  | $ 40.3 |  |  | 40.1
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership Interest (in hundredths) |  | 35.00% |  | 35.00% |  |  |
Total investments in unconsolidated affiliates |  | $ 343.4 |  | $ 343.4 |  |  | 349.3
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership Interest (in hundredths) |  | 45.00% |  | 45.00% |  |  |
Total investments in unconsolidated affiliates |  | $ 37.2 |  | $ 37.2 |  |  | 37.9
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership Interest (in hundredths) |  | 33.30% |  | 33.30% |  |  |
Total investments in unconsolidated affiliates |  | $ 171.7 |  | $ 171.7 |  |  | 170.0
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% |  |  |
Total investments in unconsolidated affiliates | [1] | $ 28.7 |  | $ 28.7 |  |  | 0.0
Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |  |  |
Equity in income of unconsolidated affiliates |  | 81.2 | 46.8 | 220.5 | 131.7 |  |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |  |  |
Unamortized excess cost amounts |  | 20.9 |  | 20.9 |  |  | 21.7
Equity method investment amortization of excess cost |  | $ 0.3 | 0.2 | $ 0.8 | 0.5 |  |
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% |  |  |
Total investments in unconsolidated affiliates |  | $ 1,403.1 |  | $ 1,403.1 |  |  | 1,431.2
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% |  |  |
Total investments in unconsolidated affiliates |  | $ 391.4 |  | $ 391.4 |  |  | 336.5
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% |  |  |
Total investments in unconsolidated affiliates | [2] | $ 23.4 |  | $ 23.4 |  |  | 0.0
Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |  |  |
Equity in income of unconsolidated affiliates |  | $ 0.9 | 0.9 | $ 2.8 | 2.7 |  |
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% |  |  |
Total investments in unconsolidated affiliates |  | $ 23.1 |  | $ 23.1 |  |  | 23.2
Petrochemical & Refined Products Services [Member] |  |  |  |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |  |  |
Equity in income of unconsolidated affiliates |  | (3.3) | (4.2) | (10.4) | (10.3) |  |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |  |  |
Unamortized excess cost amounts |  | 2.4 |  | 2.4 |  |  | 2.4
Equity method investment amortization of excess cost |  | $ 0.0 | 0.0 | $ 0.0 | 0.1 |  |
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% |  |  |
Total investments in unconsolidated affiliates |  | $ 5.8 |  | $ 5.8 |  |  | 6.5
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership Interest (in hundredths) |  | 50.00% |  | 50.00% |  |  |
Total investments in unconsolidated affiliates |  | $ 67.2 |  | $ 67.2 |  |  | 66.1
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates |  | 2.4 |  | 2.4 |  |  | 2.5
Offshore Pipelines & Services [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates |  |  |  |  |  | $ 482.4 |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |  |  |  |
Equity in income of unconsolidated affiliates |  | 5.4 | 17.1 | 46.6 | 35.8 |  |
Unamortized excess cost amounts by business segment [Abstract] |  |  |  |  |  |  |
Unamortized excess cost amounts | [3] | 0.0 |  | 0.0 |  |  | 9.0
Equity method investment amortization of excess cost |  | 0.0 | $ 0.3 | 2.8 | $ 0.8 |  |
Offshore Pipelines & Services [Member] | Poseidon Oil Pipeline Company, L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates | [4] | 0.0 |  | 0.0 |  |  | 31.8
Offshore Pipelines & Services [Member] | Cameron Highway Oil Pipeline Company [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates | [4] | 0.0 |  | 0.0 |  |  | 201.3
Offshore Pipelines & Services [Member] | Deepwater Gateway, L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates | [4] | 0.0 |  | 0.0 |  |  | 79.6
Offshore Pipelines & Services [Member] | Neptune Pipeline Company, L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates | [4] | 0.0 |  | 0.0 |  |  | 34.9
Offshore Pipelines & Services [Member] | Southeast Keathley Canyon Pipeline Company L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments in unconsolidated affiliates | [4] | $ 0.0 |  | $ 0.0 |  |  | $ 146.1
[1] | New joint venture formed with Oxy Delaware Basin Plant, LLC, a subsidiary of Occidental Petroleum Corporation, in April 2015 that will plan, design and construct a new cryogenic natural gas processing plant to accommodate the growing production of NGL-rich natural gas in the Delaware Basin.
[2] | New joint venture formed with Plains Marketing, L.P., a subsidiary of Plains All American Pipeline, L.P., in March 2015 to construct and operate a marine terminal that will handle crude oil delivered by Eagle Ford Pipeline LLC.
[3] | Our investments in unconsolidated affiliates classified within the Offshore Pipelines & Services segment were sold to Genesis in July 2015.
[4] | Our investments in unconsolidated affiliates classified within the Offshore Pipelines & Services segment were sold to Genesis on July 24, 2015 (see Note 6). At June 30, 2015, the carrying value of these investments was $482.4 million.

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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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