Condensed Consolidated Statements of Changes in Equity Statement - USD ($) $ in Millions	Total	Class A Common Stock [Member]	Class B common stock [Member]	Common Stock [Member] Class A Common Stock [Member]	Common Stock [Member] Class B common stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	PBF LLC [Member]	PBF LLC [Member] Common Stock [Member] Series A Units [Member]	PBF LLC [Member] Common Stock [Member] Series C Units [Member]	PBF LLC [Member] Retained Earnings [Member]	PBF LLC [Member] AOCI Attributable to Parent [Member]	PBF LLC [Member] Treasury Stock [Member]	PBF LLC [Member] Noncontrolling Interest [Member]
Balance, beginning of period, shares at Dec. 31, 2018				119,874,191	20				6,274,261			1,206,325	119,895,422
Balance, beginning of period at Dec. 31, 2018	$ 3,248.5			$ 0.1	$ 0.0	$ 2,633.8	$ 225.8	$ (22.4)	$ (160.8)	$ 572.0	$ 3,219.4	$ 20.2	$ 2,009.8	$ 914.3	$ (23.9)	$ (160.8)	$ 459.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	307.2						266.4	1.1		39.7	400.7			363.5	1.1		36.1
Exercise of warrants and options (in shares)				7,525								10,000	7,525
Stockholders' Equity, Warrants And Options Exercised	0.2					0.2					(0.8)	$ (0.1)	$ 0.9
Taxes paid for net settlement of equity-based compensation	1.0					1.0
Distributions to PBF Energy Company LLC members	(2.7)									(2.7)
Distributions to PBF Logistics LP public unitholders	(47.0)									(47.0)
Stock-based compensation (in shares)				54,475									54,475
Stock-based compensation	25.9					20.3				5.6	25.9		$ 20.3				5.6
Dividends	(107.9)						(107.9)
Dividends per common share (in dollars per share)		$ 0.90
Issuance of additional PBFX common units	132.5					152.0				(19.5)
Stock Issued During Period, Shares, Conversion of Convertible Securities				10,000								(10,000)	10,000
Stock Issued During Period, Value, Conversion of Convertible Securities	0.1					0.1					0.0	$ 0.1	$ (0.1)
Distribution To Unitholders											(210.8)			(163.8)			(47.0)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	(132.5)										(132.5)		$ (152.0)				19.5
Stock Redeemed or Called During Period, Shares				(43,367)					43,367				43,367
Stock Redeemed or Called During Period, Value	0.0					1.4			$ (1.4)		0.0		$ 1.4			(1.4)
Other	(1.5)									(1.5)	1.5						1.5
Balance, end of period, shares at Sep. 30, 2019				119,902,824	20				6,317,628			1,206,325	119,924,055
Balance, end of period at Sep. 30, 2019	3,554.3			$ 0.1	$ 0.0	2,806.8	384.3	(21.3)	$ (162.2)	546.6	3,565.4	$ 20.2	$ 2,182.7	1,114.0	(22.8)	(162.2)	433.5
Balance, beginning of period, shares at Jun. 30, 2019				119,894,441	20				6,315,761			1,206,325	119,915,672
Balance, beginning of period at Jun. 30, 2019	3,513.1			$ 0.1	$ 0.0	2,800.4	350.8	(21.7)	$ (162.2)	545.7	3,502.4	$ 20.2	$ 2,176.4	1,058.2	(23.2)	(162.2)	433.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	86.7						69.5	0.4		16.8	108.5			92.1	0.4		16.0
Stockholders' Equity, Warrants And Options Exercised											(0.1)		$ (0.1)
Distributions to PBF Energy Company LLC members	(0.4)									(0.4)
Distributions to PBF Logistics LP public unitholders	(17.0)									(17.0)
Stock-based compensation (in shares)				10,250									10,250
Stock-based compensation	7.6					6.4				1.2	7.6		$ 6.4				1.2
Dividends	(36.0)						(36.0)
Dividends per common share (in dollars per share)		$ 0.30
Distribution To Unitholders											(53.3)			(36.3)			(17.0)
Stock Redeemed or Called During Period, Shares				(1,867)					1,867				1,867
Stock Redeemed or Called During Period, Value	0.0										0.0
Other	0.3									0.3	(0.3)						(0.3)
Balance, end of period, shares at Sep. 30, 2019				119,902,824	20				6,317,628			1,206,325	119,924,055
Balance, end of period at Sep. 30, 2019	3,554.3			$ 0.1	$ 0.0	2,806.8	384.3	(21.3)	$ (162.2)	546.6	3,565.4	$ 20.2	$ 2,182.7	1,114.0	(22.8)	(162.2)	433.5
Balance, beginning of period, shares at Dec. 31, 2019		119,804,971	20	119,804,971	20				6,424,787			1,215,317	119,826,202
Balance, beginning of period at Dec. 31, 2019	3,585.5			$ 0.1	$ 0.0	2,812.3	401.2	(8.3)	$ (165.7)	545.9	3,609.1	$ 20.0	$ 2,189.4	1,142.4	(9.7)	(165.7)	432.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(1,049.5)						(1,094.0)	(2.2)		46.7	(1,303.0)			(1,364.7)	1.4		60.3
Exercise of warrants and options (in shares)				7,500								9,977	7,500
Stockholders' Equity, Warrants And Options Exercised	0.2					0.2					(0.9)	$ 0.1	$ 0.8
Taxes paid for net settlement of equity-based compensation	0.9					0.9
Distributions to PBF Energy Company LLC members	(0.4)									(0.4)
Distributions to PBF Logistics LP public unitholders	(36.9)									(36.9)
Stock-based compensation (in shares)				159,377									159,377
Stock-based compensation	24.6					21.4				3.2	24.6		$ 21.4				3.2
Dividends	(35.9)						(35.9)
Dividends per common share (in dollars per share)		$ 0.30
Stock Issued During Period, Shares, Conversion of Convertible Securities				254,647	(4)							(254,647)	254,647
Stock Issued During Period, Value, Conversion of Convertible Securities	0.0					2.3				(2.3)	0.0	$ 2.3	$ (2.3)
Distribution To Unitholders											(73.2)			(36.3)			(36.9)
Stock Redeemed or Called During Period, Shares				(74,900)					74,900				74,900
Stock Redeemed or Called During Period, Value	0.0					1.3			$ (1.3)		0.0		$ 1.3			(1.3)
Other	4.1					4.9				(0.8)	0.8						0.8
Balance, end of period, shares at Sep. 30, 2020		120,151,595	16	120,151,595	16				6,499,687			970,647	120,172,826
Balance, end of period at Sep. 30, 2020	2,490.8			$ 0.1	$ 0.0	2,841.5	(728.7)	(10.5)	$ (167.0)	555.4	2,255.8	$ 17.6	$ 2,213.6	(258.6)	(8.3)	(167.0)	458.5
Balance, beginning of period, shares at Jun. 30, 2020				120,032,858	17				6,455,930			975,625	120,054,089
Balance, beginning of period at Jun. 30, 2020	2,889.7			$ 0.1	$ 0.0	2,832.7	(311.5)	(10.8)	$ (165.7)	544.9	2,672.1	$ 17.6	$ 2,204.4	179.8	(8.6)	(165.7)	444.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(397.5)						(417.2)	0.3		19.4	(415.3)			(438.4)	0.3		22.8
Stockholders' Equity, Warrants And Options Exercised											0.0
Distributions to PBF Logistics LP public unitholders	(9.9)									(9.9)
Stock-based compensation (in shares)				157,516									157,516
Stock-based compensation	8.9					7.9				1.0	8.9		$ 7.9				1.0
Stock Issued During Period, Shares, Conversion of Convertible Securities				4,978	(1)							(4,978)	4,978
Stock Issued During Period, Value, Conversion of Convertible Securities	0.0										0.0
Distribution To Unitholders											(9.9)						(9.9)
Stock Redeemed or Called During Period, Shares				(43,757)					43,757				43,757
Stock Redeemed or Called During Period, Value	0.0					1.3			$ (1.3)		0.0		$ 1.3			(1.3)
Other	(0.4)					(0.4)					0.0
Balance, end of period, shares at Sep. 30, 2020		120,151,595	16	120,151,595	16				6,499,687			970,647	120,172,826
Balance, end of period at Sep. 30, 2020	$ 2,490.8			$ 0.1	$ 0.0	$ 2,841.5	$ (728.7)	$ (10.5)	$ (167.0)	$ 555.4	$ 2,255.8	$ 17.6	$ 2,213.6	$ (258.6)	$ (8.3)	$ (167.0)	$ 458.5