Consolidated Statements of Cash Flows $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Statement of Cash Flows [Abstract]
Net loss	$ (43.6)	$ (55.1)	$ (103.8)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Net loss from discontinued operations	0.0	4.1	72.5
Depreciation and amortization	110.1	118.1	154.8
Amortization of turnaround costs	19.3	12.8	24.3
Non-cash interest expense	6.1	7.9	10.2
Debt extinguishment costs	2.2	58.8	0.0
Unrealized (gain) loss on derivative instruments	26.1	(30.2)	(3.6)
Loss on impairment and disposal of assets	37.0	0.0	207.3
Operating lease expense	78.2	0.0	0.0
Operating lease payments	(78.2)	0.0	0.0
Equity based compensation	5.9	(1.2)	11.6
Lower of cost or market inventory adjustment	(35.6)	30.6	(30.6)
(Gain) loss from unconsolidated affiliates	(3.8)	3.7	0.0
Gain on sale of unconsolidated affiliates	1.2	0.2	0.0
(Gain) loss on sale of business, net	8.7	(4.8)	(236.0)
Other non-cash activities	(0.4)	6.8	10.2
Changes in assets and liabilities:
Accounts receivable	(37.0)	109.8	(158.9)
Inventories	16.3	(0.3)	(8.5)
Prepaid expenses and other current assets	4.5	(4.5)	(0.8)
Derivative activity	(0.3)	(0.5)	(0.5)
Turnaround costs	(17.8)	(27.9)	(14.5)
Other assets	(0.1)	0.0	(0.5)
Accounts payable	71.3	(78.2)	70.6
Accrued interest payable	1.5	(21.8)	0.9
Accrued salaries, wages and benefits	5.3	(5.6)	18.0
Other taxes payable	2.5	(0.9)	0.9
Other liabilities	14.8	(45.4)	(24.2)
Pension and postretirement benefit obligations	0.1	(0.1)	(2.7)
Net cash provided by (used in) discontinued operating activities	0.0	(0.7)	(23.2)
Net cash provided by (used in) operating activities	191.9	75.2	(26.5)
Investing activities
Additions to property, plant and equipment	(54.9)	(49.8)	(70.0)
Investment in unconsolidated affiliates	0.0	(3.8)	0.0
Proceeds from sale of unconsolidated affiliates	5.0	9.9	0.0
Proceeds from sale of property, plant and equipment	3.7	0.4	0.3
Proceeds from sale of business, net	55.1	44.8	484.5
Net cash provided by discontinued investing activities	5.6	6.8	38.6
Net cash provided by investing activities	14.5	8.3	453.4
Financing activities
Proceeds from borrowings — revolving credit facility	508.5	174.5	901.2
Repayments of borrowings — revolving credit facility	(508.5)	(174.7)	(911.2)
Proceeds from borrowings — senior notes	550.0	0.0	0.0
Repayments of borrowings — senior notes	(898.5)	(400.0)	0.0
Payments on finance lease obligations	(0.9)	(1.6)	(2.5)
Proceeds from inventory financing	1,076.5	1,135.3	671.6
Payments on inventory financing	(1,057.3)	(1,128.3)	(571.5)
Proceeds from other financing obligations	0.0	4.7	0.0
Payments on other financing obligations	(1.9)	(2.5)	(2.3)
Payments on extinguishment of debt	0.0	(46.6)	0.0
Debt issuance costs	(11.0)	(3.0)	(2.2)
Contributions from Calumet GP, LLC	0.1	0.1	0.1
Net cash provided by (used in) financing activities	(343.0)	(442.1)	83.2
Net increase (decrease) in cash, cash equivalents and restricted cash	(136.6)	(358.6)	510.1
Cash, cash equivalents and restricted cash at beginning of year	155.7	514.3	4.2
Cash, cash equivalents and restricted cash at end of year	19.1	155.7	514.3
Cash and cash equivalents	19.1	155.7	164.3
Restricted cash	0.0	0.0	350.0
Supplemental disclosure of cash flow information
Interest Paid, Excluding Capitalized Interest, Operating Activities	128.0	170.8	163.7
Income taxes paid	0.0	0.4	0.4
Non-cash consideration received for the sale of Anchor	0.0	0.0	25.4
Non-cash property, plant and equipment additions	$ 11.8	$ 2.6	$ 9.1