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Contract Services and Advanced Technology License and Decommissioning Costs	12 Months Ended
	Dec. 31, 2017
Research and Development [Abstract]
Contract Services and Advanced Technology License and Decommissioning Costs	CONTRACT SERVICES AND ADVANCED TECHNOLOGY LICENSE AND DECOMMISSIONING COSTS The contract services segment includes Revenue and Cost of Sales for engineering and testing work Centrus performs on the American Centrifuge technology under government contract with UT-Battelle. The recently completed fixed price contract between Centrus and UT-Battelle (the “2017 ORNL Contract”) was for the period from October 1, 2016, through September 30, 2017, and generated revenue of approximately $25.0 million. On October 26, 2017, the parties executed a new fixed priced contract for the period from October 1, 2017, through September 30, 2018, that is expected to generate revenue of approximately $16.0 million upon completion of defined milestones. The ORNL contracts have been funded incrementally. Funding for the program is provided to UT-Battelle by the federal government which is currently operating under a continuing resolution. The 2017 ORNL Contract provided for payments for monthly reports of deliverables of approximately $2.0 million per month and additional aggregate payments of $1.0 million based on completion of certain defined milestones. The Company’s contract with UT-Battelle that ended September 30, 2016 (the “2016 ORNL Contract”), provided for payments for monthly reports of approximately $2.7 million per month. The 2016 ORNL Contract, which was signed in March 2016, provided for payment for reports related to work performed since October 1, 2015. Revenue in 2016 includes $8.1 million for March 2016 reports on work performed in the three months ended December 31, 2015, and $30.4 million for reports on work performed in the year ended December 31, 2016. Expenses for work performed in the three months ended December 31, 2015, before entering into the 2016 ORNL Contract, were expensed in 2015. American Centrifuge expenses that are outside of the Company’s contracts with UT-Battelle are included in Advanced Technology License and Decommissioning Costs, including ongoing costs to maintain the demobilized Piketon facility and our licenses from the U.S. Nuclear Regulatory Commission (“NRC”) at that location. Charges to Advanced Technology License and Decommissioning Costs in 2016 included demobilization costs of approximately $7.0 million incurred in early 2016 in preparation for the D&D of the Piketon facility. Charges in 2016 also included $19.0 million to increase the accrued D&D liability based on updated cost estimates that reflected changes in the approach and schedule. D&D costs commenced in the second quarter of 2016 and are charged against the D&D liability. Most of the D&D work was completed by December 31, 2017, and a credit of $5.9 million to Advanced Technology License and Decommissioning Costs was recognized in the fourth quarter of 2017 as a result of using primarily internal resources and less contractor support as well as efficiencies achieved. Refer to Note 16, Commitments and Contingencies, for additional details.

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The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 730
-URI http://asc.fasb.org/subtopic&trid=2197926

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