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Inventories
 3 Months Ended
Mar. 31, 2021
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):
 March 31, 2021December 31, 2020
 Current
Assets		Current
Liabilities
(a)		Inventories, NetCurrent
Assets		Current
Liabilities
(a)		Inventories, Net
Separative work units$14.8 $0.1 $14.7 $17.0 $4.6 $12.4 
Uranium68.7 13.2 55.5 47.8 0.3 47.5 
Total$83.5 $13.3 $70.2 $64.8 $4.9 $59.9 
(a)Inventories owed to customers and suppliers, included in current liabilities, include SWU and uranium inventories owed to fabricators.