XML 62 R47.htm IDEA: XBRL DOCUMENT v3.7.0.1
Contract Services and Advanced Technology License and Decommissioning Costs (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Contract revenue current work   $ 30.4      
Contract revenue past work   8.1      
D&D Expense   19.0   $ 7.0  
Decontamination and decommissioning obligations - total   $ 38.6      
2017 ORNL Contract [Member] | Scenario, Forecast [Member]          
Contract value $ 25.0        
Contract monthly revenue 2.0        
Contract milestone payments $ 1.0        
2016 ORNL Contract [Member]          
Contract monthly revenue     $ 2.7    
2015 ORNL Contract [Member]          
Contract monthly revenue         $ 6.9