Inventory - Schedule of Effect of Change in Accounting Principle (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021		Sep. 30, 2022	Sep. 30, 2021		Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of materials and other	$ 4,916.0	$ 2,678.0	[1]	$ 14,151.1	$ 6,811.4	[1]
Total cost of sales	5,180.7	2,836.0	[1]	14,869.3	7,352.9	[1]
Income (loss) before income tax expense (benefit)	20.8	25.1	[1]	507.7	(129.2)	[1]
Income tax expense (benefit)	4.0	4.5	[1]	107.5	(39.0)	[1]
Net income (loss)	16.8	20.6	[2]	400.2	(90.2)	[1]
Net income (loss) attributable to Delek	$ 7.4	$ 11.8	[1]	$ 375.8	$ (114.9)	[1]
Basic income (loss ) per share (USD per Share)	$ 0.11	$ 0.16	[1]	$ 5.26	$ (1.55)	[1]
Diluted income (loss) per share (USD per share)	$ 0.10	$ 0.16	[1]	$ 5.21	$ (1.55)	[1]
Inventories, net of inventory valuation reserves	$ 1,634.2			$ 1,634.2			$ 1,260.7	[3]
Assets	8,396.8			8,396.8			6,812.6	[3]
Accrued expenses and other current liabilities	969.8			969.8			797.8	[3]
Deferred tax liabilities	309.6			309.6			214.5	[3]
Retained earnings	731.8			731.8			384.7	[3]
Total liabilities and stockholders' equity	8,396.8			8,396.8			6,812.6	[3]
Non-cash lower of cost or market/net realizable value adjustment				19.1	$ 0.3	[4]
Deferred income taxes				95.6	(44.6)	[4]
Inventories and other current assets				(419.8)	(239.1)	[4]
Accounts payable and other current liabilities				524.8	632.7	[4]
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of materials and other	4,797.2	$ 2,670.1		14,198.8	6,871.4
Total cost of sales	5,061.9	2,828.1		14,917.0	7,412.9
Income (loss) before income tax expense (benefit)	139.6	33.0		460.0	(189.2)
Income tax expense (benefit)	29.3	6.1		97.4	(52.3)
Net income (loss)		26.9		362.6	(136.9)
Net income (loss) attributable to Delek	$ 100.9	$ 18.1		$ 338.2	$ (161.6)
Basic income (loss ) per share (USD per Share)	$ 1.43	$ 0.24		$ 4.73	$ (2.19)
Diluted income (loss) per share (USD per share)	$ 1.42	$ 0.24		$ 4.69	$ (2.19)
Inventories, net of inventory valuation reserves	$ 1,527.9			$ 1,527.9			1,176.1
Assets	8,290.5			8,290.5			6,728.0
Accrued expenses and other current liabilities	990.5			990.5
Deferred tax liabilities	286.7			286.7			196.4
Retained earnings	627.7			627.7			318.2
Total liabilities and stockholders' equity	8,290.5			8,290.5			6,728.0
Non-cash lower of cost or market/net realizable value adjustment				19.5	$ (29.9)
Deferred income taxes				90.8	(50.3)
Inventories and other current assets				(398.5)	(186.0)
Accounts payable and other current liabilities				545.5	662.2
Revision of Prior Period, Change in Accounting Principle, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of materials and other	(118.8)	$ 7.9		47.7	(60.0)
Total cost of sales	(118.8)	7.9		47.7	(60.0)
Income (loss) before income tax expense (benefit)	118.8	(7.9)		(47.7)	60.0
Income tax expense (benefit)	25.3	(1.6)		(10.1)	13.3
Net income (loss)		(6.3)		(37.6)	46.7
Net income (loss) attributable to Delek	$ 93.5	$ (6.3)		$ (37.6)	$ 46.7
Basic income (loss ) per share (USD per Share)	$ 1.32	$ (0.08)		$ (0.53)	$ 0.64
Diluted income (loss) per share (USD per share)	$ 1.32	$ (0.08)		$ (0.52)	$ 0.64
Inventories, net of inventory valuation reserves	$ (106.3)			$ (106.3)			84.6
Assets	(106.3)			(106.3)			84.6
Accrued expenses and other current liabilities	20.7			20.7
Deferred tax liabilities	(22.9)			(22.9)			18.1
Retained earnings	(104.1)			(104.1)			66.5
Total liabilities and stockholders' equity	$ (106.3)			(106.3)			$ 84.6
Non-cash lower of cost or market/net realizable value adjustment				0.4	$ 30.2
Deferred income taxes				(4.8)	5.7
Inventories and other current assets				21.3	(53.1)
Accounts payable and other current liabilities				$ 20.7	$ (29.5)

[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.