Unaudited Condensed Consolidated Statements of Partners' Capital - USD ($) $ in Millions	Total	General Partner	Limited Partners	Accumulated Other Comprehensive Loss
Beginning of Period at Dec. 31, 2018	$ 65.7	$ 12.8	$ 61.6	$ (8.7)
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income	1.2	0.0	0.0	1.2
Net loss	(0.4)	0.0	(0.4)	0.0
Settlement of tax withholdings on equity-based incentive compensation	(0.5)	0.0	(0.5)	0.0
Amortization of phantom units	1.0	0.0	1.0	0.0
End of Period at Jun. 30, 2019	67.1	12.9	61.7	(7.5)
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Calumet GP, LLC	0.1	0.1	0.0	0.0
Beginning of Period at Mar. 31, 2019	83.5	13.2	77.8	(7.5)
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income	0.0
Net loss	(16.8)	(0.3)	(16.5)	0.0
Settlement of tax withholdings on equity-based incentive compensation	(0.2)	0.0	(0.2)	0.0
Amortization of phantom units	0.6	0.0	0.6	0.0
End of Period at Jun. 30, 2019	67.1	12.9	61.7	(7.5)
Beginning of Period at Dec. 31, 2019	21.6	12.0	20.2	(10.6)
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income	(0.2)	0.0	0.0	(0.2)
Net loss	(10.8)	(0.2)	(10.6)	0.0
Settlement of tax withholdings on equity-based incentive compensation	(0.5)	0.0	(0.5)	0.0
Amortization of phantom units	0.8	0.0	0.8	0.0
End of Period at Jun. 30, 2020	10.9	11.8	9.9	(10.8)
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Calumet GP, LLC	0.0
Beginning of Period at Mar. 31, 2020	7.0	11.7	6.1	(10.8)
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income	0.0
Net loss	3.6	0.1	3.5	0.0
Settlement of tax withholdings on equity-based incentive compensation	(0.2)	0.0	(0.2)	0.0
Amortization of phantom units	0.5	0.0	0.5	0.0
End of Period at Jun. 30, 2020	$ 10.9	$ 11.8	$ 9.9	$ (10.8)