REVENUES (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenues	$ 2,499.1	$ 6,551.9	$ 7,759.1	$ 11,760.6
Deferred revenue	18.1		18.1		$ 17.0
Gasoline and distillates
Revenues	2,035.9	5,570.7	6,606.3	10,003.7
Feedstocks and other
Revenues	215.3	203.9	526.6	404.6
Asphalt and blackoils
Revenues	164.1	531.8	371.1	884.8
Chemicals
Revenues	45.5	177.6	158.3	329.3
Lubricants
Revenues	$ 38.3	$ 67.9	$ 96.8	$ 138.2

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration