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Inventory Financing Agreement Inventory Financing Agreement (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 19, 2017
bbl / d
Mar. 31, 2017
bbl / d
Oil and Gas, Delivery Commitment [Line Items]          
Financing Costs $ 134.6 $ 155.5 $ 183.1    
Supply and Offtake Agreements          
Oil and Gas, Delivery Commitment [Line Items]          
Financing Costs $ 15.3 17.0 $ 6.8    
Deferred payment arrangement, maximum percentage of eligible inventory 90.00%        
Deferred payment arrangement, outstanding amount $ 26.3 $ 20.4      
Supply and Offtake Agreements | London Interbank Offered Rate (LIBOR)          
Oil and Gas, Delivery Commitment [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 3.25%        
Macquarie | Supply and Offtake Agreements          
Oil and Gas, Delivery Commitment [Line Items]          
Amount retained from initial inventory to cover credit and liquidation risks $ 8.7        
Supply and Offtake Agreements          
Oil and Gas, Delivery Commitment [Line Items]          
Amount retained from initial inventory to cover credit and liquidation risks $ 5.0        
Montana | Supply and Offtake Agreements          
Oil and Gas, Delivery Commitment [Line Items]          
Barrels of crude oil per day provided by Macquarie | bbl / d         30,000
Shreveport | Supply and Offtake Agreements          
Oil and Gas, Delivery Commitment [Line Items]          
Barrels of crude oil per day provided by Macquarie | bbl / d       60,000