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Equity Method Investment (Details)
bbl / d in Thousands, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
bbl / d
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
bbl / d
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Related Party Transaction [Line Items]              
Investment in joint venture           $ 0.6 $ 3.2
Income from equity method investment   $ 0.1   $ 0.2      
CRRM | Velocity Central Oklahoma Pipeline LLC | Velocity Transportation Agreement              
Related Party Transaction [Line Items]              
Related party costs   $ 0.7   $ 1.2      
Transportation agreement, average barrels per day | bbl / d   18   16      
Due to related party   $ 0.2   $ 0.2   $ 0.2  
Velocity Pipeline Partners, LLC | Coffeyville Resources Pipeline, LLC              
Related Party Transaction [Line Items]              
Joint venture interest   40.00%   40.00%   40.00%  
Equity method investments   $ 6.3   $ 6.3   $ 6.3  
Investment in joint venture     $ 1.4   $ 7.0    
Distribution received from equity method investment $ 0.9            
Velocity Pipeline Partners, LLC | Velocity Central Oklahoma Pipeline LLC              
Related Party Transaction [Line Items]              
Joint venture interest held by others   60.00%   60.00%   60.00%