Condensed Consolidated Statements of Changes in Equity Statement - USD ($) $ in Millions	Total	Member's Equity [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2019	$ 3,897.2	$ 2,739.1	$ (9.7)	$ 1,156.9	$ 10.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Member distributions	(21.1)	0.0	0.0	(21.1)	0.0
Capital contributions from PBF LLC	24.4	24.4	0.0	0.0	0.0
Stock-based compensation	13.5	13.5	0.0	0.0	0.0
Comprehensive income (loss)	(955.0)	0.0	1.1	(956.1)	0.0
Ending balance at Jun. 30, 2020	2,959.0	2,777.0	(8.6)	179.7	10.9
Beginning balance at Mar. 31, 2020	2,409.1	2,745.9	(8.9)	(338.8)	10.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from PBF LLC	24.4	24.4	0.0	0.0	0.0
Stock-based compensation	6.7	6.7	0.0	0.0	0.0
Comprehensive income (loss)	518.8	0.0	0.3	518.5	0.0
Ending balance at Jun. 30, 2020	2,959.0	2,777.0	(8.6)	179.7	10.9
Beginning balance at Dec. 31, 2020	2,090.8	2,809.7	(6.1)	(723.4)	10.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Member distributions	(2.0)	0.0	0.0	(2.0)	0.0
Capital contributions from PBF LLC	18.9	18.9	0.0	0.0	0.0
Distribution of assets to PBF LLC	(0.3)	(0.3)	0.0	0.0	0.0
Stock-based compensation	12.8	12.8	0.0	0.0	0.0
Comprehensive income (loss)	(14.2)	0.0	(0.1)	(16.5)	2.4
Other	(0.7)	0.0	0.0	0.0	(0.7)
Ending balance at Jun. 30, 2021	2,105.3	2,841.1	(6.2)	(741.9)	12.3
Beginning balance at Mar. 31, 2021	2,048.4	2,825.6	(6.5)	(781.5)	10.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Member distributions	(1.0)	0.0	0.0	(1.0)	0.0
Capital contributions from PBF LLC	8.9	8.9	0.0	0.0	0.0
Distribution of assets to PBF LLC	(0.3)	(0.3)	0.0	0.0	0.0
Stock-based compensation	6.9	6.9	0.0	0.0	0.0
Comprehensive income (loss)	43.1	0.0	0.3	40.6	2.2
Other	(0.7)	0.0	0.0	0.0	(0.7)
Ending balance at Jun. 30, 2021	$ 2,105.3	$ 2,841.1	$ (6.2)	$ (741.9)	$ 12.3