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DEFERRED CHARGES AND OTHER ASSETS, NET (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Deferred turnaround costs, net $ 598.2 $ 722.7  
Catalyst, net 155.2 132.7  
Environmental credits 39.6 37.8  
Linefill 27.4 19.5  
Pension plan assets 21.2 10.3  
Intangible assets, net 10.1 24.3  
Other 20.5 7.6  
Total deferred charges and other assets, net 872.2 954.9  
Amortization expense 325.9 258.1 $ 207.6
Accelerated Amortization, Deferred Turnaround Costs 56.2    
Intangible Assets, Net [Abstract]      
Intangible assets - gross 25.5 29.5  
Accumulated amortization (15.4) (5.2)  
Intangible assets - net 10.1 24.3  
PBF LLC [Member]      
Deferred turnaround costs, net 598.2 722.7  
Catalyst, net 155.2 132.7  
Environmental credits 39.6 37.8  
Linefill 27.4 19.5  
Pension plan assets 21.2 10.3  
Intangible assets, net 10.1 24.3  
Other 20.6 6.5  
Total deferred charges and other assets, net 872.3 953.8  
Indefinitely-Lived Precious Metal [Member]      
Catalyst, net $ 115.2 $ 74.5