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STOCK-BASED COMPENSATION (Share-Based Compensation Expense) (Details) - General and Administrative Expense [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense $ 34.2 $ 37.3 $ 26.0
PBF Logistics LP [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense 4.9 6.8 5.8
Performance Shares [Member] | PBF Energy [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense 7.9 8.2 1.2
Employee Stock Option [Member] | PBF Energy [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense 16.1 15.8 11.5
Restricted Stock [Member] | PBF Energy [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense $ 5.3 $ 6.5 $ 7.5