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Commitments and Contingencies - Joint Venture Agreement (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017
Related Party Transaction [Line Items] |  |  |
Investment in joint venture | $ 1.4 | $ 0.0 |
Coffeyville Resources Pipeline, LLC | Velocity Pipeline Partners, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Joint venture interest | 40.00% |  | 40.00%
Investment in joint venture | $ 1.4 |  | $ 7.0
Velocity Central Oklahoma Pipeline LLC | Velocity Pipeline Partners, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Joint venture interest held by others | 60.00% |  | 60.00%

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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Details
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