Advanced Technology Costs and Other Income	12 Months Ended
Advanced Technology Costs and Other Income	Dec. 31, 2014
Research and Development [Abstract]
Advanced Technology Costs and Other Income	ADVANCED TECHNOLOGY COSTS AND OTHER INCOME From June 2012 through April 2014, the Company performed work under the June 2012 cooperative agreement with DOE (the "Cooperative Agreement") for the American Centrifuge technology with cost-share funding from DOE. The objectives of the Cooperative Agreement were (1) to demonstrate the American Centrifuge technology through the construction and operation of a commercial demonstration cascade of 120 centrifuge machines and (2) sustain the domestic U.S. centrifuge technical and industrial base for national security purposes and potential commercialization of the American Centrifuge technology. This included activities to reduce the technical risks and improve the future prospects of deployment of the American Centrifuge technology. The Company achieved or exceeded all of the program milestones and performance indicators on or ahead of schedule and on or under budget. The Cooperative Agreement, as amended, defined the scope, funding and technical goals for the centrifuge research, development and demonstration program. The Cooperative Agreement provided for 80% DOE and 20% Company cost sharing for work performed June 1, 2012 through April 30, 2014, up to a total government cost share of $280 million. The Cooperative Agreement expired in accordance with its terms on April 30, 2014. DOE’s cost share was recognized as other income. Total costs for work performed under the Cooperative Agreement was $352.2 million with DOE's cost share equal to $280 million (79.5%) and the Company's cost share equal to $72.2 million (20.5%). As described in Note 20, on May 1, 2014, the Company signed the ACTDO Agreement with UT-Battelle, the management and operating contractor for ORNL, for continued cascade operations and continuation of core American Centrifuge research and technology activities and the furnishing of related reports to ORNL. The scope of the overall work under the ACTDO Agreement is reduced from the scope of work that was being conducted by the Company under the Cooperative Agreement. Revenue and cost of sales for work that Centrus performs under the fixed-price ACTDO Agreement as a subcontractor to UT-Battelle are reported in the contract services segment. American Centrifuge costs incurred by Centrus that are outside of the ACTDO Agreement are included in advanced technology costs. The Company incurred $12.3 million in the nine months ended September 30, 2014 and $4.7 million in the three months ended December 31, 2014, for certain demobilization and maintenance costs related to American Centrifuge that are included in advanced technology costs.

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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