Discontinued Operations Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 21, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
clmt_DiscontinuedOperationsLossonSale		$ 0.0	$ 4.1	$ 62.6
Working capital adjustment		(6.9)
Other accounts receivable		$ 13.5	20.3
Annual Interest Rate on Balance		6.00%
Q'Max Agreement Final Payment		Jun. 30, 2021
Anchor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Date	Nov. 21, 2017
Base price	$ 50.0
Working capital adjustment	$ 14.2
Other accounts receivable		$ 5.5	$ 11.1
Nontrade Receivables, Noncurrent		$ 1.8
Fluid Holding Corp
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percent Ownership	10.00%
Closing Date Value | Anchor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration	$ 89.6
True up Date Value | Anchor
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration	$ 0.0