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DEFERRED CHARGES AND OTHER ASSETS, NET (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred turnaround costs, net $ 1,086.6 $ 860.8  
Catalyst, net [1] 191.1 180.4  
Environmental credits 42.5 42.5  
Linefill 27.4 27.4  
Pension plan assets 19.4 18.8  
Other 12.5 13.1  
Total deferred charges and other assets, net 1,379.5 1,143.0  
Amortization expense 358.3 314.4 $ 262.0
Intangible Assets, Net [Abstract]      
Intangible assets - gross 25.5 25.5  
Accumulated amortization (17.4) (16.9)  
Intangible assets - net 8.1 8.6  
Indefinite-lived precious metal catalysts      
Catalyst, net $ 115.0 $ 114.2  
[1] Catalyst, net includes $115.0 million and $114.2 million of indefinite-lived precious metal catalysts as of December 31, 2024 and December 31, 2023, respectively.