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Inventories
 6 Months Ended
Jun. 30, 2025
Inventory, Net [Abstract]  
Inventories INVENTORIES
Centrus holds uranium at licensed locations (e.g., fabricators) in the form of natural uranium hexafluoride and as the uranium component of LEU in transit to meet book transfer requests by customers and suppliers. 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. The components of the Company’s inventories are as follows (in millions):

 June 30, 2025December 31, 2024
 Current
Assets		Current
Liabilities
(a)		Inventories, NetCurrent
Assets		Current
Liabilities
(a)		Inventories, Net
Separative work units$17.1 $— $17.1 $5.0 $2.5 $2.5 
Uranium303.4 127.4 176.0 156.6 13.7 142.9 
Total$320.5 $127.4 $193.1 $161.6 $16.2 $145.4 

(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 may borrow SWU or uranium from customers, suppliers or fabricators, in which case the Company will record the SWU and/or uranium and the related liability for the borrowing using projected and forecasted purchase price over the borrowing period.

In the three and six months ended June 30, 2025, the Company repaid SWU inventory loans borrowed from a customer valued at $12.3 million and $38.8 million, respectively, by utilizing advances of SWU from the fabricator under an existing optimization agreement. In June 2025, the Company also repaid its UF6 inventory loan valued at $29.8 million.
The Company performs quarterly revaluations of Long-Term Inventory Loans reflecting an updated projection of the timing and sources of inventory to be used for repayment. These revaluations were recorded to Cost of Sales and resulted in an increase to the related liability of $1.5 million and $3.6 million, for the three and six months ended June 30, 2025, respectively, and $1.5 million and $1.8 million for the three and six months ended June 30, 2024, respectively.