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Equity Investees (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jul. 24, 2015 | Jun. 30, 2015
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Equity Method Investments [Line Items] |  |  |  |  |
Unamortized excess cost amount | $ 402.1 |  | $ 414.0 |  |
Deepwater Gateway Acquisition [Member] |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Business Acquisition, Transaction Costs |  | $ 0.0 |  |  |
Enterprise Offshore Acquisition |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Business Acquisition, Transaction Costs |  |  |  | $ 1,500.0 |
Cameron Highway Oil Pipeline Company [Member] | Enterprise Offshore Acquisition |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  |  | 50.00% |
Equity Method Investment, Ownership Percentage | 50.00% |  |  | 100.00% |
Sekco [Member] | Enterprise Offshore Acquisition |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  |  | 50.00% |
Equity Method Investment, Ownership Percentage |  |  |  | 100.00% | 50.00%
Poseidon Oil Pipeline Company [Member] |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 64.00% |  |  |  |
Poseidon Oil Pipeline Company [Member] | Enterprise Offshore Acquisition |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  |  | 36.00% |
Equity Method Investment, Ownership Percentage | 28.00% |  |  | 64.00% |
Deepwater Gateway LLC [Member] | Deepwater Gateway Acquisition [Member] |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  | 50.00% |  |  |
Equity Method Investment, Ownership Percentage | 100.00% |  |  |  |
Deepwater Gateway LLC [Member] | Enterprise Offshore Acquisition |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |
Neptune Pipeline Company LLC [Member] | Enterprise Offshore Acquisition |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 25.70% |

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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