REVENUES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenues	$ 6,883.2	$ 2,499.1	$ 11,796.4	$ 7,759.1
Deferred revenue	26.3		26.3		$ 45.1
Gasoline And Distillate [Member]
Revenues	5,990.6	2,035.9	10,220.7	6,606.3
Asphalt and Residual Oil [Member]
Revenues	298.4	164.1	513.8	371.1
Feedstocks and other [Member]
Revenues	290.6	215.3	502.9	526.6
Chemicals [Member]
Revenues	230.4	45.5	425.1	158.3
Lubricants [Member]
Revenues	$ 73.2	$ 38.3	$ 133.9	$ 96.8