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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%