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Inventory Financing Agreements - Supply and Offtake Agreements (Details) - Supply and Offtake Agreements
$ in Millions
Jun. 01, 2021
USD ($)
day
Feb. 01, 2020
USD ($)
settlement_payment
Jun. 27, 2018
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 01, 2018
USD ($)
Supply Commitment [Line Items]            
Amount of deferred payment arrangement $ 165.0   $ 165.0      
Percentage of receivables and inventory for deferred payment arrangement (in percent) 85.00%   85.00%      
Deferral arrangement fee       $ 118.7 $ 80.1  
Outstanding amount of deferred payment arrangement       114.9 78.6  
Fee agreement receivable (payable)   $ 0.8   $ 3.1 $ 0.5 $ 2.2
Number of settlement payments | settlement_payment   15        
Commitment period 1 year          
Termination period between extension date 120 days          
Inventory maintain minimum liquidity of not less than amount $ 15.0          
Number of consecutive business days | day 3          
Inventory liquidity consisting of cash and cash equivalents $ 7.5          
Amount deferred payment arrangement, inventory $ 82.5          
Minimum            
Supply Commitment [Line Items]            
Related Party Transaction, Rate (in percent) 3.50%          
Maximum            
Supply Commitment [Line Items]            
Related Party Transaction, Rate (in percent) 4.00%          
London Interbank Offered Rate (LIBOR)            
Supply Commitment [Line Items]            
Margin on LIBOR rate (in percent) 4.00%