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, 2018	$ 3,529.8	$ 2,652.5	$ (23.9)	$ 890.3	$ 10.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Member distributions	(23.0)	0.0	0.0	(23.0)	0.0
Distribution of assets to PBF LLC	0.3	0.3	0.0	0.0	0.0
Stock-based compensation	6.2	6.2	0.0	0.0	0.0
Net income (loss)	312.1	0.0	0.0	312.1	0.0
Other comprehensive income	0.2	0.0	0.2	0.0	0.0
Ending balance at Mar. 31, 2019	3,825.0	2,658.4	(23.7)	1,179.4	10.9
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
Stock-based compensation	6.8	6.8	0.0	0.0	0.0
Net income (loss)	(1,474.6)	0.0	0.0	(1,474.6)	0.0
Other comprehensive income	0.8	0.0	0.8	0.0	0.0
Ending balance at Mar. 31, 2020	$ 2,409.1	$ 2,745.9	$ (8.9)	$ (338.8)	$ 10.9