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Segment Information Schedule Of Entity Wide Revenue By Major Customers (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Customer A [Member] | Low Enriched Uranium Segment [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 23.4 $ 35.0
Customer A [Member] | Contract Services Segment [Member]    
Revenue, Major Customer [Line Items]    
Revenue 9.7  
Customer B [Member] | Low Enriched Uranium Segment [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 7.3