Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities
Net loss	$ (10.8)	$ (0.4)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	52.6	55.2
Amortization of turnaround costs	8.7	10.4
Non-cash interest expense	3.1	3.5
(Gain) loss on debt extinguishment	0.0	(0.7)
Unrealized (gain) loss on derivative instruments	(30.4)	14.8
Loss on impairment and disposal of assets	6.7	27.9
Operating lease expense	32.6	37.8
Operating lease payments	(32.4)	(37.4)
Equity-based compensation	0.6	4.6
Lower of cost or market inventory adjustment	34.2	(41.5)
Other non-cash activities	1.7	(3.6)
Changes in assets and liabilities:
Accounts receivable	27.7	(66.6)
Inventories	18.1	40.5
Prepaid expenses and other current assets	1.8	6.0
Derivative activity	(0.3)	(0.3)
Turnaround costs	(16.1)	(6.4)
Increase (Decrease) in Other Noncurrent Assets	0.0	(0.1)
Accounts payable	(55.0)	42.9
Accrued interest payable	(1.4)	(0.5)
Accrued salaries, wages and benefits	(10.1)	(3.0)
Other taxes payable	(0.4)	2.7
Other liabilities	19.8	3.6
Pension and postretirement benefits obligations	(0.3)	0.0
Net cash provided by operating activities	50.4	89.6
Investing activities
Additions to property, plant and equipment	(28.4)	(17.1)
Payments to Acquire Businesses, Net of Cash Acquired	(3.3)	0.0
Proceeds from sale of unconsolidated affiliate	0.0	5.0
Proceeds from sale of business, net	0.0	3.7
Net cash provided by discontinued operations	0.9	5.0
Net cash used in investing activities	(30.8)	(3.4)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from borrowings — revolving credit facility	672.7	0.0
Repayments of borrowings — revolving credit facility	(562.4)	0.0
Repayments of borrowings — senior notes	0.0	88.6
Payments on finance lease obligations	(0.2)	(0.7)
Proceeds from inventory financing agreements	399.3	569.7
Payments on inventory financing agreements	(441.4)	(547.7)
Proceeds from other financing obligations	31.4	0.0
Payments on other financing obligations	(32.7)	(1.2)
Contributions from Calumet GP, LLC	0.0	0.1
Net cash provided by (used in) in financing activities	66.7	(68.4)
Net increase in cash and cash equivalents	86.3	17.8
Cash and cash equivalents at beginning of period	19.1	155.7
Cash and cash equivalents at end of period	105.4	173.5
Cash and cash equivalents	105.4	173.5
Supplemental disclosure of non-cash investing activities
Non-cash property, plant and equipment additions	$ 4.3	$ 5.6