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INVENTORIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory [Line Items]      
Crude oil and feedstocks $ 1,018.9 $ 1,074.1  
Refined products and blendstocks 1,200.2 1,328.9  
Warehouse stock and other 136.7 120.8  
Inventory, Gross 2,355.8 2,523.8  
Lower of cost or market adjustment (669.6) (401.6) $ (651.8)
Total inventories 1,686.2 2,122.2  
Income from operations (1,611.4) 498.5 $ 231.4
Inventory, LIFO Reserve, Effect on Income, Net 83.0 4.9  
Titled Inventory [Member]      
Inventory [Line Items]      
Crude oil and feedstocks 1,018.9 1,071.4  
Refined products and blendstocks 933.7 976.0  
Warehouse stock and other 136.7 120.8  
Inventory, Gross 2,089.3 2,168.2  
Lower of cost or market adjustment (572.4) (324.8)  
Total inventories 1,516.9 1,843.4  
Inventory Supply and Offtake Arrangements [Member]      
Inventory [Line Items]      
Crude oil and feedstocks 0.0 2.7  
Refined products and blendstocks 266.5 352.9  
Warehouse stock and other 0.0 0.0  
Inventory, Gross 266.5 355.6  
Lower of cost or market adjustment (97.2) (76.8)  
Total inventories 169.3 278.8  
Adjustment [Member]      
Inventory [Line Items]      
Income from operations $ (268.0) $ 250.2