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Equity Method Investment (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		7 Months Ended
Equity Method Investment (Details) - USD ($) $ in Millions	Jul. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Apr. 30, 2017
Related Party Transaction [Line Items]
Investment in joint venture				$ 1.4	$ 0.0
Income from equity method investment		$ 0.1		$ 0.1	$ 0.0
Coffeyville Resources Pipeline, LLC \| Velocity Pipeline Partners, LLC
Related Party Transaction [Line Items]
Joint venture interest		40.00%		40.00%
Equity method investments		$ 7.1		$ 7.1
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%
Subsequent Event \| Coffeyville Resources Pipeline, LLC \| Velocity Pipeline Partners, LLC
Related Party Transaction [Line Items]
Distribution received from equity method investment	$ 0.9
Velocity Transportation Agreement \| Velocity Central Oklahoma Pipeline LLC \| CRRM
Related Party Transaction [Line Items]
Related party costs		$ 0.5
Due to related party		$ 0.3		$ 0.3