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STOCK-BASED COMPENSATION (Summary of Unit Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Total estimated fair value, granted in period $ 4.2 $ 11.6 $ 13.0
Performance Units [Member] | PBF Energy [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance (in shares) 15,100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 8,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares [1] (7,300,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) (200,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) 16,100,000 15,100,000  
Total estimated fair value, granted in period $ 3.2    
Performance Share Units | PBF Energy [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares (179,072) [2] (50.23)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 623,160 360,797  
Weighted average exercise price (in dollars per share) $ 15.62 $ 39.03  
Granted (in shares) 446,267    
Granted (in dollars per share) $ 10.77 $ 27.99 $ 50.23
Forfeited (in dollars per share) $ 33.01    
Forfeited (in shares) (4,832)    
Total estimated fair value, granted in period $ 0.8    
[1] (a) In 2020, Performance Units with fair value of $3.2 million were vested.
[2] (a) In 2020, PSU’s with fair value of $0.8 million were vested.