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Inventories
 3 Months Ended
Mar. 31, 2023
Inventory, Net [Abstract]  
Inventories INVENTORIES
Centrus holds uranium at licensed locations (e.g., fabricators) or in transit in the form of natural uranium and as the uranium component of LEU. Centrus also holds SWU as the SWU component of LEU at licensed locations or in transit to meet book transfer requests by customers and suppliers. Fabricators process LEU into fuel for use in nuclear reactors. Components of inventories are as follows (in millions):
 March 31, 2023December 31, 2022
 Current
Assets		Current
Liabilities
(a)		Inventories, NetCurrent
Assets		Current
Liabilities
(a)		Inventories, Net
Separative work units$25.9 $— $25.9 $24.1 $— $24.1 
Uranium183.5 17.2 166.3 185.1 60.8 124.3 
Total$209.4 $17.2 $192.2 $209.2 $60.8 $148.4 

(a)This includes inventories owed to suppliers for advances of uranium.

Inventories are valued at the lower of cost or net realizable value.
The Company also may borrow SWU or uranium from customers or suppliers, in which case the Company will record the SWU and/or uranium and the related liability for the borrowing using a projected and forecasted purchase price over the borrowing period. In March 2023, the Company borrowed UF6 which was recorded to inventory at a value of $22.5 million. The inventory value was recorded based on the estimated fair market value of the inventory on the date of borrowing. In March 2023, the Company performed a revaluation of the Long-Term Inventory Loans reflecting an updated projection of the timing and sources of inventory to be used for repayment. This revaluation was recorded to Cost of Sales and resulted in an increase of $2.1 million to the related liability. At March 31, 2023, the total liability of borrowed inventory was $83.2 million, of which $73.3 million was recorded in Long-Term Inventory Loans and $9.9 million was recorded in Accounts Payable and Accrued Liabilities. At December 31, 2022, the total liability of borrowed inventory was $58.6 million, of which $48.7 million was recorded in Long-Term Inventory Loans and $9.9 million was recorded in Accounts Payable and Accrued Liabilities.