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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in unconsolidated affiliates |  | $ 2,677.3 | $ 2,628.5 | $ 3,042.0
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates |  | 362.0 | 373.6 | 259.5
Unamortized excess cost amounts by business segment: |  |  |  |
Unamortized excess cost amounts |  | 45.2 | 46.9 |
Equity method investment amortization of excess cost |  | 2.1 | 4.9 | 3.3
Forecasted amortization of excess cost amounts - 2017 |  | 2.2 |  |
Forecasted amortization of excess cost amounts - 2018 |  | 2.2 |  |
Forecasted amortization of excess cost amounts - 2019 |  | 2.2 |  |
Forecasted amortization of excess cost amounts - 2020 |  | 2.2 |  |
Forecasted amortization of excess cost amounts - 2021 |  | 2.2 |  |
Balance Sheet Data: |  |  |  |
Current assets |  | 199.5 | 204.5 |
Property, plant and equipment, net |  | 5,644.4 | 5,671.1 |
Other assets |  | 61.5 | 58.9 |
Total assets |  | 5,905.4 | 5,934.5 |
Current liabilities |  | 208.5 | 306.7 |
Other liabilities |  | 112.3 | 103.2 |
Combined equity |  | 5,584.6 | 5,524.6 |
Total liabilities and combined equity |  | 5,905.4 | 5,934.5 |
Income Statement Data: |  |  |  |
Revenues |  | 1,342.0 | 1,426.6 | 1,311.3
Operating income |  | 786.7 | 825.8 | 600.0
Net income |  | 781.7 | 814.1 | 587.9
NGL Pipelines & Services [Member] |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates |  | 61.4 | 57.5 | 30.6
Unamortized excess cost amounts by business segment: |  |  |  |
Unamortized excess cost amounts |  | $ 24.1 | 25.3 |
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 |  | $ 24.8 | 25.9 |
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 |  | $ 33.7 | 38.3 |
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 32.20% |  |
Investments in unconsolidated affiliates |  | $ 17.3 | 18.5 |
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 |  | $ 38.9 | 39.8 |
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 35.00% |  |
Investments in unconsolidated affiliates |  | $ 331.9 | 342.0 |
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 45.00% |  |
Investments in unconsolidated affiliates |  | $ 35.8 | 36.8 |
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 33.30% |  |
Investments in unconsolidated affiliates |  | $ 165.4 | 171.2 |
NGL Pipelines & Services [Member] | Delaware Basin Gas Processing LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |
Investments in unconsolidated affiliates |  | $ 102.6 | 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 |  | 311.9 | 281.4 | 184.6
Unamortized excess cost amounts by business segment: |  |  |  |
Unamortized excess cost amounts |  | $ 19.0 | 19.3 |
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 |  | $ 1,393.8 | 1,396.0 |
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 |  | $ 377.9 | 388.8 |
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 |  | $ 52.9 | 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 |  | $ 3.8 | 3.8 | 3.6
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 |  | $ 21.7 | 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 | [1] | (15.1) | (15.7) | (13.3)
Unamortized excess cost amounts by business segment: |  |  |  |
Unamortized excess cost amounts |  | $ 2.1 | 2.3 |
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |
Investments in unconsolidated affiliates |  | $ 62.3 | 65.6 |
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in unconsolidated affiliates |  | 18.3 | 8.3 |
Offshore Pipelines & Services [Member] |  |  |  |
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract] |  |  |  |
Equity in income (loss) of unconsolidated affiliates |  | $ 0.0 | $ 46.6 | $ 54.0
[1] | 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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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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