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CST Fuel Supply Exchange Agreement - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 25, 2020
USD ($)
Property
Site
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Gain on divestiture of investment     $ 6.4 $ 1.4
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 $ 14.1      
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 56      
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 331