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Inventories
 9 Months Ended
Sep. 30, 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):
 September 30, 2020December 31, 2019
 Current
Assets		Current
Liabilities
(a)		Inventories, NetCurrent
Assets		Current
Liabilities
(a)		Inventories, Net
Separative work units$10.1 $3.1 $7.0 $7.8 $— $7.8 
Uranium56.5 4.7 51.8 56.7 5.6 51.1 
Total$66.6 $7.8 $58.8 $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.