Crude Oil Supply and Inventory Purchase Agreement - Letters of Credit (Details) - J. Aron - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
El Dorado Refinery
Oil and Gas, Delivery Commitment [Line Items]
Letters of credit outstanding	$ 150.0	$ 180.0
Big Spring And Krotz Spring
Oil and Gas, Delivery Commitment [Line Items]
Letters of credit outstanding	$ 10.0	$ 44.0

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