Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 50.8	$ (1,412.9)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	331.4	352.0
Stock-based compensation	20.1	25.9
Change in fair value of catalyst obligations	(13.6)	(4.2)
Deferred income taxes	(15.6)	8.6
Non-cash change in inventory repurchase obligations	46.0	(19.1)
Non-cash lower of cost or market inventory adjustment	(669.6)	691.5
Change in fair value of contingent consideration	23.6	(79.3)
(Gain) loss on extinguishment of debt	(60.3)	22.2
Pension and other post-retirement benefit costs	38.0	41.5
Gain on sale of assets	(0.4)	(469.4)
Changes in operating assets and liabilities:
Accounts receivable	(549.3)	371.4
Due to/from affiliates	11.0	7.7
Inventories	(475.6)	169.3
Prepaid and other current assets	(65.2)	(22.1)
Accounts payable	34.8	(392.9)
Accrued expenses	1,564.4	(168.9)
Deferred revenue	(5.5)	1.1
Other assets and liabilities	(80.1)	(57.4)
Net cash provided by (used in) operating activities	184.9	(935.0)
Cash flows from investing activities:
Expenditures for property, plant and equipment	(135.1)	(148.4)
Expenditures for deferred turnaround costs	(64.6)	(175.8)
Expenditures for other assets	(20.6)	(9.7)
Acquisition of Martinez refinery	0.0	(1,176.2)
Proceeds from sale of assets	0.0	529.4
Net cash used in investing activities	(220.3)	(980.7)
Cash flows from financing activities:
Contributions from PBF LLC	28.0	33.4
Proceeds from revolver borrowings	0.0	1,450.0
Repayments of revolver borrowings	0.0	(550.0)
Settlement of precious metal catalyst obligations	(18.5)	(8.8)
Proceeds from catalyst financing arrangements	0.0	51.9
Payments on financing leases	(10.7)	(8.9)
Proceeds from insurance premium financing	7.0	12.7
Deferred financing costs and other	0.4	(29.6)
Net cash (used in) provided by financing activities	(92.9)	2,405.6
Net (decrease) increase in cash and cash equivalents	(128.3)	489.9
Cash and cash equivalents, beginning of period	1,570.1	763.1
Cash and cash equivalents, end of period	1,441.8	1,253.0
Non-cash activities:
Accrued and unpaid capital expenditures	64.5	22.6
Assets acquired or remeasured under operating and financing leases	(126.5)	690.7
Fair value of the Martinez Contingent Consideration at acquisition	0.0	77.3
Cash paid during the period for:
Interest (net of capitalized interest of $5.3 million and $9.4 million in 2021 and 2020, respectively)	173.9	88.2
Capitalized interest	5.3	9.4
Income taxes	0.8	0.6
Members
Cash flows from financing activities:
Payments of Capital Distribution	(2.0)	(22.2)
Collins Pipeline Company and T&M Terminal Company
Cash flows from financing activities:
Payments of Capital Distribution	(0.7)	0.0
2025 Senior Secured Notes [Member]
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt	0.0	1,000.0
2028 Senior Notes [Member]
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt	0.0	1,000.0
Repayments of Long-term Debt	(69.7)	0.0
2023 Senior Notes [Member]
Cash flows from financing activities:
Repayments of Long-term Debt	0.0	(517.5)
Rail Term Loan [Member]
Cash flows from financing activities:
Repayments of Long-term Debt	(5.5)	(5.4)
2025 Senior Notes [Member]
Cash flows from financing activities:
Repayments of Long-term Debt	$ (21.2)	$ 0.0