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Partnership Operations, Organization and Basis for Presentation (Details) bbl in Millions, $ in Millions, ft³ in Billions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 Segment mi bbl ft³ | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |
Number of miles of pipelines | mi | 49,000 |  |
Number of barrels of storage capacity | bbl | 250 |  |
Number of cubic feet of storage capacity | ft³ | 14 |  |
Number of reportable segments | Segment | 5 |  |
Limited partners ownership interest (in hundredths) | 100.00% |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs in current assets |  | $ 14.7 |
Unamortized debt issuance costs in other assets |  | 135.1 |
Total unamortized debt issuance costs |  | $ 149.8 |
EPCO and its privately held affiliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of Total Units Outstanding (in hundredths) | 33.30% |  |
Oiltanking Partners L.P. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Limited partner interests acquired (in hundredths) |  |  | 65.90%

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