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INVENTORIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventory [Line Items]      
Crude oil and feedstocks $ 1,074.1 $ 1,044.8  
Refined products and blendstocks 1,328.9 1,361.7  
Warehouse stock and other 120.8 109.4  
Inventory, Gross 2,523.8 2,515.9  
Lower of cost or market adjustment (401.6) (651.8) $ (300.5)
Total inventories 2,122.2 1,864.1  
Income from operations 498.5 231.4 $ 598.1
Inventory, LIFO Reserve, Effect on Income, Net 4.9 21.9  
Titled Inventory [Member]      
Inventory [Line Items]      
Crude oil and feedstocks 1,071.4 1,044.8  
Refined products and blendstocks 976.0 1,026.9  
Warehouse stock and other 120.8 109.4  
Inventory, Gross 2,168.2 2,181.1  
Lower of cost or market adjustment (324.8) (557.2)  
Total inventories 1,843.4 1,623.9  
Inventory Supply and Offtake Arrangements [Member]      
Inventory [Line Items]      
Crude oil and feedstocks 2.7 0.0  
Refined products and blendstocks 352.9 334.8  
Warehouse stock and other 0.0 0.0  
Inventory, Gross 355.6 334.8  
Lower of cost or market adjustment (76.8) (94.6)  
Total inventories 278.8 240.2  
Adjustment [Member]      
Inventory [Line Items]      
Income from operations $ (250.2) $ (351.3)