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Inventories
 12 Months Ended
Dec. 31, 2020
Inventory, Net [Abstract]  
Inventories INVENTORIES
Centrus holds uranium at licensed locations 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 (e.g., fabricators) to meet book transfer requests by customers. Fabricators process LEU into fuel for use in nuclear reactors. Components of inventories are as follows (in millions):
 December 31, 2020December 31, 2019
 Current
Assets		Current
Liabilities
(a)		Inventories, NetCurrent
Assets		Current
Liabilities
(a)		Inventories, Net
Separative work units$17.0 $4.6 $12.4 $7.8 $— $7.8 
Uranium47.8 0.3 47.5 56.7 5.6 51.1 
Total$64.8 $4.9 $59.9 $64.5 $5.6 $58.9 

(a)Inventories owed to customers and suppliers, included in current liabilities, include SWU and uranium inventories owed to fabricators.

Inventories are valued at the lower of cost or net realizable value. Valuation adjustments for uranium inventory to reflect declines in uranium market price indicators totaled $2.3 million in 2019. There were no valuation adjustments in 2020.

In March 2019, the Company completed a purchase of SWU and uranium from Nuclear Fuel Industries, Ltd. (“NFI”) for $7.1 million pursuant to an August 2018 agreement between Enrichment Corp. and NFI. Toshiba America Nuclear Energy Corporation (“TANE”) holds 718,200 shares of the Company’s Class B common stock and certain of the 8.25% Notes. Each of NFI and TANE are wholly-owned, indirect subsidiaries of Toshiba Corporation.