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Inventory Financing Agreement Inventory Financing Agreement - Narrative (Details)
$ in Millions
3 Months Ended
May 09, 2019
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jun. 19, 2017
D / bbl
Mar. 31, 2017
D / bbl
Oil and Gas, Delivery Commitment [Line Items]            
Financing costs   $ 29.3 $ 32.3      
Obligations under inventory financing agreements   $ 95.1   $ 134.3    
Inventory Financing Obligations | London Interbank Offered Rate (LIBOR)            
Oil and Gas, Delivery Commitment [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   3.25%        
Inventory Financing Obligations            
Oil and Gas, Delivery Commitment [Line Items]            
Interest Income, Other   $ (1.8)        
Financing costs     $ 1.8      
Deferred payment arrangement, maximum percentage of eligible inventory   90.00%        
Deferred payment arrangement, outstanding amount   $ 9.5   $ 26.3    
Obligations under inventory financing agreements   5.0        
Inventory Financing Obligations | Macquarie            
Oil and Gas, Delivery Commitment [Line Items]            
Amount retained from initial inventory purchase to cover credit and liquidation risks   $ 8.8        
Great Falls, MT [Member]            
Oil and Gas, Delivery Commitment [Line Items]            
Inventory Financing Agreement Extension Jun. 30, 2023          
Great Falls, MT [Member] | Inventory Financing Obligations            
Oil and Gas, Delivery Commitment [Line Items]            
Barrels of crude oil per day provided by Macquarie (in barrels per day) | D / bbl           30,000
shreveport [Member]            
Oil and Gas, Delivery Commitment [Line Items]            
Inventory Financing Agreement Extension Jun. 30, 2023          
shreveport [Member] | Inventory Financing Obligations            
Oil and Gas, Delivery Commitment [Line Items]            
Barrels of crude oil per day provided by Macquarie (in barrels per day) | D / bbl         60,000