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Inventory Financing Agreements - Washington Refinery Intermediation Agreement (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
London Interbank Offered Rate (LIBOR)      
Supply Commitment [Line Items]      
Basis spread on variable rate   3.25%  
Washington Refinery Intermediation Agreement      
Supply Commitment [Line Items]      
Percentage of receivables and inventory for deferred payment   95.00%  
Amount of deferred payment arrangement   $ 90.0  
Commitment fee percentage 0.75% 1.50%  
Balance outstanding on the revolving credit facility   $ 41.1 $ 63.8
Washington Refinery Intermediation Agreement | Letter of Credit      
Supply Commitment [Line Items]      
Line of credit, current   $ 93.6 $ 127.2