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Inventory Financing Agreements - Washington Refinery Intermediation Agreement (Details) - Washington Refinery Intermediation Agreement - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Supply Commitment [Line Items]    
Outstanding receivable advance balance $ 68.0 $ 41.1
Letter of Credit    
Supply Commitment [Line Items]    
Balance outstanding on the credit facility $ 95.8 $ 93.6