CST Fuel Supply Exchange Agreement - Additional Information (Details) $ in Millions		3 Months Ended
Mar. 25, 2020 USD ($) Property Site	Mar. 31, 2020 USD ($)
Business Acquisition [Line Items]
Gain on divestiture of investment		$ 1.6
CST Fuel Supply Exchange Agreement [Member]
Business Acquisition [Line Items]
Number of leased convenience store properties \| Property	33
Cash received from Circle K in lieu of Removed Properties	$ 13.4
Business divested and assets acquired based on discounted cash flow analysis	$ 69.0
Gain on divestiture of investment		$ 67.6
CST Fuel Supply Exchange Agreement [Member] \| CST Brands Inc. [Member]
Business Acquisition [Line Items]
Equity method investment, ownership percentage	17.50%
Number of properties sold \| Property	12
Number of sites sold \| Site	49
CST Fuel Supply Exchange Agreement [Member] \| Circle K Stores Inc. [Member]
Business Acquisition [Line Items]
Breach of contract period	18 months
CST Fuel Supply Exchange Agreement [Member] \| Wholesale Fuel Supply Contracts/Rights [Member]
Business Acquisition [Line Items]
Number of additional sites \| Site	333

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Number of additional sites.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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