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Inventory Financing Agreements - Supply and Offtake Agreements (Details) - Supply and Offtake Agreements $ in Millions | Feb. 01, 2020 USD ($) settlement_payment | Jun. 27, 2018 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 01, 2018 USD ($) | Jun. 01, 2015 USD ($)
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Supply Commitment [Line Items] |  |  |  |  |  |
Amount of deferred payment arrangement |  | $ 165.0 |  |  |  |
Percentage of receivables and inventory for deferred payment arrangement |  | 85.00% |  |  |  |
Deferral arrangement fee |  |  |  |  |  | $ 1.3
Capacity of deferred payment arrangement |  |  | $ 102.0 | $ 80.1 |  |
Outstanding amount of deferred payment arrangement |  |  | 96.2 | 78.6 |  |
Fee agreement receivable (payable) | $ 0.8 |  | $ 0.2 | $ 0.5 | $ 2.2 |
Number of settlement payments | settlement_payment | 15 |  |  |  |  |

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- Definition Purchase And Supply Commitment, Deferred Payment Arrangement, Deferral Arrangement Fee + References No definition available. + Details
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