INVENTORIES (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Crude oil and feedstocks		$ 1,336.1
Refined products and blendstocks		1,285.6
Warehouse stock and other		141.9
Inventory, Gross	$ 3,180.9	2,763.6
Lower of cost or market adjustment		0.0
Total inventories	3,180.9	2,763.6
Provisional Payments for Inventory Supply and Offtake Arrangements	268.0
Costs associated with exiting inventory intermediation agreement	13.5
Scenario, Adjustment
Inventory [Line Items]
Lower of cost or market adjustment	0.0	0.0
Titled Inventory
Inventory [Line Items]
Crude oil and feedstocks	1,533.0	1,195.2
Refined products and blendstocks	1,501.3	1,244.7
Warehouse stock and other	146.6	141.9
Inventory, Gross		2,581.8
Lower of cost or market adjustment	$ 0.0	0.0
Total inventories		2,581.8
Inventory Intermediation Agreement
Inventory [Line Items]
Crude oil and feedstocks		140.9
Refined products and blendstocks		40.9
Warehouse stock and other		0.0
Inventory, Gross		181.8
Lower of cost or market adjustment		0.0
Total inventories		$ 181.8