REVENUES (Schedule of Revenue from External Customers) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Product Information [Line Items]
Revenues	$ 38,288.5	$ 46,780.6	$ 27,202.0
Deferred revenue	63.6	37.5
Gasoline and distillates
Product Information [Line Items]
Revenues	34,002.5	41,465.0	23,489.5
Asphalt and blackoils
Product Information [Line Items]
Revenues	1,650.1	2,123.8	1,217.8
Feedstocks and other
Product Information [Line Items]
Revenues	1,640.6	1,863.0	1,310.1
Chemicals
Product Information [Line Items]
Revenues	650.6	903.8	889.8
Lubricants
Product Information [Line Items]
Revenues	$ 344.7	$ 425.0	$ 294.8