Contract Services and Advanced Technology Costs	9 Months Ended
Contract Services and Advanced Technology Costs	Sep. 30, 2016
Research and Development [Abstract]
Contract Services and Advanced Technology Costs and Other Income	CONTRACT SERVICES AND ADVANCED TECHNOLOGY 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, LLC (“UT-Battelle”), the operator of Oak Ridge National Laboratory (“ORNL”). Centrus entered into a new contract with UT-Battelle on September 19, 2016, valued at approximately $25 million for the period from October 1, 2016, through September 30, 2017 (the “2017 ORNL Contract”). The 2017 ORNL Contract provides for payments for monthly reports of approximately $2.0 million per month and additional aggregate payments of $1.0 million based on completion of certain milestones. The 2017 ORNL Contract is currently being funded incrementally. Funding for the program is provided to UT-Battelle by the federal government which is currently operating under a continuing resolution. 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 amount of funding under the 2016 ORNL Contract decreased from approximately $6.9 million per month received under contract for the government fiscal year that ended September 30, 2015 (the “2015 ORNL Contract”). Although the 2015 ORNL Contract expired September 30, 2015, Centrus continued to perform work at the expected reduced scope as the parties worked toward a successor agreement. 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 the nine months ended September 30, 2016, includes $8.1 million for March reports on work performed in the three months ended December 31, 2015, and $24.2 million for reports on work performed in the nine months ended September 30, 2016. Expenses for contract work performed in the nine months ended September 30, 2016, are included in Cost of Sales. Expenses for work performed in the three months ended December 31, 2015, before entering into the 2016 ORNL Contract, were included in Advanced Technology Costs in 2015. American Centrifuge expenses that are outside of the Company’s contracts with UT-Battelle are included in Advanced Technology Costs, including costs associated with the decontamination and decommissioning (“D&D”) of the Piketon facility in accordance with the requirements of the U.S. Nuclear Regulatory Commission (“NRC”) and DOE. Charges to Advanced Technology Costs in the three and nine months ended September 30, 2016, include approximately $15 million to increase the accrued D&D liability based on updated cost estimates that reflect changes in the approach and anticipated timeframe over which the work will be conducted. Remaining costs to perform the D&D work are estimated to be within a range of $38.9 million to $49.4 million. As of September 30, 2016, Centrus has accrued $38.9 million on the balance sheet as Decontamination and Decommissioning Obligations, of which $28.3 million is classified as current and $10.6 million is classified as long-term. Refer to Note 12, Commitments and Contingencies, for additional details. Advanced Technology Costs also includes ongoing support costs to maintain the facilities at Piketon and our NRC licenses at that location.

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.