Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions		Total		IEP Energy Holding LLC	Revision of Prior Period, Change in Accounting Principle, Adjustment		Common Stock		Common Stock IEP Energy Holding LLC	Additional Paid-in Capital		Additional Paid-in Capital IEP Energy Holding LLC	Accumulated Other Comprehensive Income		Retained Earnings		Retained Earnings Revision of Prior Period, Change in Accounting Principle, Adjustment	[1]	Treasury Stock		Non-Controlling Interest in Subsidiaries		Commodity contracts	[1]	Commodity contracts Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2020							91,356,868
Beginning balance at Dec. 31, 2020		$ 1,125.1	[1]		$ (8.7)	[1]	$ 0.9			$ 1,185.1			$ (7.2)		$ 522.0	[1]	$ (8.7)		$ (694.1)		$ 118.4
Treasury Stock, Common, Shares at Dec. 31, 2020																			(17,575,527)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(90.2)	[2]		46.7										(114.9)	[1]					24.7
Other comprehensive loss related to commodity contracts, net		(0.2)	[3]																				$ (0.2)		$ (0.2)
Distribution to non-controlling interest		(24.1)	[1]																		(24.1)
Equity-based compensation expense		17.4	[1]							17.3											0.1
Taxes due to the net settlement of equity-based compensation		(3.4)	[1]							(3.4)											0.0
Exercise of equity-based awards (shares)							343,596
Other		(0.3)	[1]							0.2			0.0		(0.3)	[1]			$ 0.0		(0.2)
Ending balance (in shares) at Sep. 30, 2021	[1]						91,700,464
Ending balance at Sep. 30, 2021	[1]	1,015.6					$ 0.9			1,199.2			(7.4)		398.1				$ (694.1)		118.9
Treasury Stock, Common, Shares at Sep. 30, 2021	[1]																		(17,575,527)
Beginning balance (in shares) at Jun. 30, 2021							91,637,661
Beginning balance at Jun. 30, 2021		996.7	[1]				$ 0.9			1,192.6			(7.4)		386.3	[1]			$ (694.1)		118.4
Treasury Stock, Common, Shares at Jun. 30, 2021																			(17,575,527)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		20.6	[1]		(6.3)										11.8	[1]					8.8
Other comprehensive loss related to commodity contracts, net	[3]	0.0
Distribution to non-controlling interest		(8.2)	[1]																		(8.2)
Equity-based compensation expense		6.9	[1]							6.8											0.1
Taxes due to the net settlement of equity-based compensation		(0.4)	[1]							(0.4)
Exercise of equity-based awards (shares)							62,803
Other		0.0	[1]							0.2											(0.2)
Ending balance (in shares) at Sep. 30, 2021	[1]						91,700,464
Ending balance at Sep. 30, 2021	[1]	1,015.6					$ 0.9			1,199.2			(7.4)		398.1				$ (694.1)		118.9
Treasury Stock, Common, Shares at Sep. 30, 2021	[1]																		(17,575,527)
Beginning balance (in shares) at Dec. 31, 2021	[1]						91,772,080
Beginning balance at Dec. 31, 2021		1,014.0	[4]				$ 0.9	[1]		1,206.5	[1]		(3.8)	[1]	384.7	[1]			$ (694.1)	[1]	119.8	[1]
Treasury Stock, Common, Shares at Dec. 31, 2021	[1]																		(17,575,527)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		400.2			$ (37.6)										375.8						24.4
Other comprehensive loss related to commodity contracts, net		0.0
Common stock dividends		(28.3)													(28.3)						0.0
Distribution to non-controlling interest		(26.9)																			(26.9)
Equity-based compensation expense		20.4								20.1											0.3
Repurchase of common stock (in shares)							(1,435,602)		(3,497,268)
Purchase of Delek common stock from IEP Energy Holding LLC		(40.0)		$ (64.0)								$ (64.0)
Sale of Delek Logistic common limited partner units, net		13.6								8.5											5.1
Taxes due to the net settlement of equity-based compensation		(5.4)								(5.4)											0.0
Exercise of equity-based awards (shares)							389,293
Other		(0.6)								0.0			(0.2)		(0.4)				$ 0.0		0.0
Ending balance (in shares) at Sep. 30, 2022							87,228,503
Ending balance at Sep. 30, 2022		1,283.0					$ 0.9			1,125.7			(4.0)		731.8				$ (694.1)		122.7
Treasury Stock, Common, Shares at Sep. 30, 2022																			(17,575,527)
Beginning balance (in shares) at Jun. 30, 2022							88,610,583
Beginning balance at Jun. 30, 2022		1,337.4					$ 0.9			1,159.1			(3.9)		753.0				$ (694.1)		122.4
Treasury Stock, Common, Shares at Jun. 30, 2022																			(17,575,527)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		16.8													7.4						9.4
Other comprehensive loss related to commodity contracts, net		0.0
Common stock dividends		(28.3)													(28.3)						0.0
Distribution to non-controlling interest		(9.2)																			(9.2)
Equity-based compensation expense		7.8								7.7											0.1
Repurchase of common stock (in shares)							(1,435,602)
Purchase of Delek common stock from IEP Energy Holding LLC		(40.0)								(40.0)
Taxes due to the net settlement of equity-based compensation		(1.1)								(1.1)
Exercise of equity-based awards (shares)							53,522
Other		(0.4)								0.0			(0.1)		(0.3)
Ending balance (in shares) at Sep. 30, 2022							87,228,503
Ending balance at Sep. 30, 2022		$ 1,283.0					$ 0.9			$ 1,125.7			$ (4.0)		$ 731.8				$ (694.1)		$ 122.7
Treasury Stock, Common, Shares at Sep. 30, 2022																			(17,575,527)

[1] Adjusted to reflect the retrospective change in accounting policy from LIFO to FIFO for certain inventories. See Note 7 for further discussion.

[2] Adjusted to reflect the retrospective change in accounting policy from LIFO to FIFO for certain inventories. See Note 7 for further discussion.

[3] Adjusted to reflect the retrospective change in accounting policy from LIFO to FIFO for certain inventories. See Note 7 for further discussion.

[4] Adjusted to reflect the retrospective change in accounting policy from LIFO to FIFO for certain inventories. See Note 7 for further discussion.