Acquisitions (Details) $ / shares in Units, bbl in Thousands, $ in Millions	Nov. 01, 2021 USD ($)	Aug. 02, 2021 USD ($) extensionOption nomination $ / shares shares	May 04, 2021 a bbl	Sep. 30, 2021 $ / shares	Dec. 31, 2020 $ / shares
Business Acquisition [Line Items]
Common stock par value (in USD per share) | $ / shares		$ 0.01		$ 0.01	$ 0.01
Woods Cross Refinery Acquisition
Business Acquisition [Line Items]
Cash considerations paid under agreement		$ 232.5
New Parent
Business Acquisition [Line Items]
Common stock par value (in USD per share) | $ / shares		$ 0.01
Puget Sound Refinery
Business Acquisition [Line Items]
Refinery area of land (in acres) | a			850
Refinery capacity for barrels of crude oil per day (in barrels) | bbl			149
Storage capacity acquired (in barrels) | bbl			5,800
Puget Sound Refinery | Subsequent Event
Business Acquisition [Line Items]
Aggregate consideration paid in acquisition	$ 613.6
Base cash purchase price in acquisition	350.0
Value of inventory transferred in acquisition	266.2
Other closing adjustments and accrued liabilities associated with acquisition	$ 2.6
New Parent | New Parent
Business Acquisition [Line Items]
Pro forma ownership percentage by parent		73.25%
New Parent | Sinclair | Scenario, Plan
Business Acquisition [Line Items]
Transaction potential termination fee		$ 200.0
Transaction potential termination reimbursement expense		$ 35.0
New Parent | Sinclair | New Parent
Business Acquisition [Line Items]
Pro forma ownership percentage by noncontrolling owner		26.75%
New Parent | Common Stock
Business Acquisition [Line Items]
Conversion of shares in transaction		1
New Parent | Common Stock | New Parent | Sinclair
Business Acquisition [Line Items]
Shares transferred in transaction (in shares) | shares		60,230,036
Sinclair Transportation Company | HEP
Business Acquisition [Line Items]
Shares transferred in transaction (in shares) | shares		21,000,000
Transaction cash consideration transferred		$ 325.0
Number of termination date extension periods in transaction | extensionOption		2
Transaction termination date extension period		90 days
Number of director nominations granted in transaction | nomination		1