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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions		12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Mar. 03, 2014 ppm	Dec. 31, 2019 USD ($) ppm	Dec. 31, 2010 ppm	Dec. 31, 2018 USD ($)
Environmental Matters
Environmental liabilities		$ 132.2		$ 141.6
Environmental liabilities, Lont-Term		$ 119.9		$ 135.1
Maximum amount of sulfur allowed in heating oil (in ppm) \| ppm	10	80
Percent of tax benefit received from increases in tax basis paid to stockholders		85.00%
Percentage of ownership in PBF LLC		100.00%
PBF Energy [Member] \| Class A Common Stock [Member]
Environmental Matters
Percentage of ownership in PBF LLC		99.00%		99.00%
Environmental Issue [Member] \| Torrance Refinery [Member]
Environmental Matters
Environmental liabilities		$ 121.3		$ 130.8
Expected future payments		$ 57.4
Executive [Member] \| Minimum [Member]
Employment Agreements
Potential lump sum payment as a multiple of base salary		1.5
Potential payment upon death or disability as a multiple of base salary		0.50
Executive [Member] \| Maximum [Member]
Employment Agreements
Potential lump sum payment as a multiple of base salary		2.99
New York [Member] \| Environmental Issue [Member]
Environmental Matters
Maximum amount of sulfur allowed in heating oil (in ppm) \| ppm			15
Northeastern States [Member] \| Environmental Issue [Member]
Environmental Matters
Maximum amount of sulfur allowed in heating oil (in ppm) \| ppm			15