Commitments and Contingencies	3 Months Ended
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES NYSE MKT Listing Standards Notice On April 28, 2017, the NYSE MKT LLC (“NYSE MKT”) informed Centrus that it was back in compliance with the NYSE MKT continued listing standards because it had resolved the continued listing deficiency with respect to Sections 1003(a)(i) and (ii) of the NYSE MKT’s Company Guide. On November 17, 2015, Centrus received a notice from the NYSE MKT indicating that the Company was not in compliance with the continued listing standards since the Company reported a stockholders’ deficit as of September 30, 2015, and net losses in its fiscal years ended December 31, 2011, 2012 and 2013. In December 2015, the Company submitted a plan to regain compliance and the NYSE MKT accepted the plan in January 2016. Effective May 1, 2017, Centrus was removed from the list of NYSE MKT noncompliant issuers on the exchange’s website. In accordance with NYSE MKT regulations, Centrus will be subject to a 12-month follow-up review period to ensure that the Company does not fall below any of the NYSE MKT’s continued listing standards. American Centrifuge Milestones Under the 2002 DOE-USEC Agreement The Company and DOE signed an agreement dated June 17, 2002, as amended (the “2002 DOE-USEC Agreement”), pursuant to which the parties made long-term commitments directed at resolving issues related to the stability and security of the domestic uranium enrichment industry. DOE consented to the assumption by Centrus of the 2002 DOE-USEC Agreement and other agreements between the Company and DOE subject to an express reservation of all rights, remedies and defenses by DOE and Centrus under those agreements as part of Centrus’ Chapter 11 bankruptcy process. The 2002 DOE-USEC Agreement requires Centrus to develop, demonstrate and deploy advanced enrichment technology in accordance with milestones and provides for remedies in the event of a failure to meet a milestone under certain circumstances. DOE has specific remedies under the 2002 DOE-USEC Agreement if Centrus fails to meet a milestone that would adversely impact its ability to begin commercial operations of the American Centrifuge Plant on schedule, and such delay was within Centrus’ control or was due to its fault or negligence or if Centrus abandons or constructively abandons the commercial deployment of an advanced enrichment technology. These remedies include terminating the 2002 DOE-USEC Agreement, revoking Centrus’ access to DOE’s centrifuge technology that is required for the success of the American Centrifuge project, requiring Centrus to transfer certain rights in the American Centrifuge technology and facilities to DOE, and requiring Centrus to reimburse DOE for certain costs associated with the American Centrifuge project. The 2002 DOE-USEC Agreement provides that if a delaying event beyond the control and without the fault or negligence of Centrus occurs that could affect Centrus’ ability to meet an American Centrifuge Plant milestone, DOE and Centrus will jointly meet to discuss in good faith possible adjustments to the milestones as appropriate to accommodate the delaying event. The Company notified DOE that it had not met the June 2014 milestone within the time period provided due to events beyond its control and without the fault or negligence of the Company. The assumption of the 2002 DOE-USEC Agreement provided for under the Plan of Reorganization did not affect the ability of either party to assert all rights, remedies and defenses under the agreement and all such rights, remedies and defenses are specifically preserved and all time limits tolled expressly including all rights, remedies and defenses and time limits relating to any missed milestones. DOE and Centrus have agreed that all rights, remedies and defenses of the parties with respect to any missed milestones since March 5, 2014, including the June 2014 and November 2014 milestones, and all other matters under the 2002 DOE-USEC Agreement continued to be preserved, and that the time limits for each party to respond to any missed milestones continue to be tolled. Piketon Facility Costs and D&D Obligations Effective October 1, 2015, the U.S. government discontinued funding of the American Centrifuge demonstration cascade at Piketon. Funding for American Centrifuge is now limited to research and development work at the Company’s facilities in Oak Ridge, Tennessee. As a result of reduced program funding, Centrus incurred a special charge in the third quarter of 2015 for estimated employee termination benefits, and began reductions in force. Refer to Note 2, Special Charges, for details. Centrus began to incur expenditures in the second quarter of 2016 associated with the D&D of the Piketon facility in accordance with the requirements of the NRC and DOE. Centrus leases the Piketon facility from DOE. At the conclusion of the lease, Centrus is obligated to return the facility to DOE in a condition that meets NRC requirements and in the same condition as the facility was in when it was leased to Centrus (other than due to normal wear and tear). Centrus must remove all Company-owned capital improvements at the Piketon facility, unless otherwise consented to by DOE, by the conclusion of the lease term. The lease will expire on June 30, 2019, unless it is extended. The D&D work is expected to extend through 2017 and be substantially completed by year-end. As of March 31, 2017, Centrus has accrued $34.9 million on the balance sheet as Decontamination and Decommissioning Obligations for the estimated fair value of the remaining costs to complete the D&D work. Centrus is required to provide financial assurance to the NRC and DOE for D&D costs under a regulatorily-prescribed methodology that includes potential contingent costs and reserves. As of March 31, 2017, Centrus has provided financial assurance to the NRC and DOE in the form of surety bonds totaling $29.6 million, which are fully cash collateralized by Centrus. Centrus expects to receive cash when surety bonds are reduced and/or cancelled as the Company fulfills its D&D and lease obligations.

COMMITMENTS AND CONTINGENCIES

NYSE MKT Listing Standards Notice

On April 28, 2017, the NYSE MKT LLC (“NYSE MKT”) informed Centrus that it was back in compliance with the NYSE MKT continued listing standards because it had resolved the continued listing deficiency with respect to Sections 1003(a)(i) and (ii) of the NYSE MKT’s Company Guide. On November 17, 2015, Centrus received a notice from the NYSE MKT indicating that the Company was not in compliance with the continued listing standards since the Company reported a stockholders’ deficit as of September 30, 2015, and net losses in its fiscal years ended December 31, 2011, 2012 and 2013. In December 2015, the Company submitted a plan to regain compliance and the NYSE MKT accepted the plan in January 2016. Effective May 1, 2017, Centrus was removed from the list of NYSE MKT noncompliant issuers on the exchange’s website. In accordance with NYSE MKT regulations, Centrus will be subject to a 12-month follow-up review period to ensure that the Company does not fall below any of the NYSE MKT’s continued listing standards.

American Centrifuge

Milestones Under the 2002 DOE-USEC Agreement

The Company and DOE signed an agreement dated June 17, 2002, as amended (the “2002 DOE-USEC Agreement”), pursuant to which the parties made long-term commitments directed at resolving issues related to the stability and security of the domestic uranium enrichment industry. DOE consented to the assumption by Centrus of the 2002 DOE-USEC Agreement and other agreements between the Company and DOE subject to an express reservation of all rights, remedies and defenses by DOE and Centrus under those agreements as part of Centrus’ Chapter 11 bankruptcy process. The 2002 DOE-USEC Agreement requires Centrus to develop, demonstrate and deploy advanced enrichment technology in accordance with milestones and provides for remedies in the event of a failure to meet a milestone under certain circumstances.

DOE has specific remedies under the 2002 DOE-USEC Agreement if Centrus fails to meet a milestone that would adversely impact its ability to begin commercial operations of the American Centrifuge Plant on schedule, and such delay was within Centrus’ control or was due to its fault or negligence or if Centrus abandons or constructively abandons the commercial deployment of an advanced enrichment technology. These remedies include terminating the 2002 DOE-USEC Agreement, revoking Centrus’ access to DOE’s centrifuge technology that is required for the success of the American Centrifuge project, requiring Centrus to transfer certain rights in the American Centrifuge technology and facilities to DOE, and requiring Centrus to reimburse DOE for certain costs associated with the American Centrifuge project.

The 2002 DOE-USEC Agreement provides that if a delaying event beyond the control and without the fault or negligence of Centrus occurs that could affect Centrus’ ability to meet an American Centrifuge Plant milestone, DOE and Centrus will jointly meet to discuss in good faith possible adjustments to the milestones as appropriate to accommodate the delaying event. The Company notified DOE that it had not met the June 2014 milestone within the time period provided due to events beyond its control and without the fault or negligence of the Company. The assumption of the 2002 DOE-USEC Agreement provided for under the Plan of Reorganization did not affect the ability of either party to assert all rights, remedies and defenses under the agreement and all such rights, remedies and defenses are specifically preserved and all time limits tolled expressly including all rights, remedies and defenses and time limits relating to any missed milestones. DOE and Centrus have agreed that all rights, remedies and defenses of the parties with respect to any missed milestones since March 5, 2014, including the June 2014 and November 2014 milestones, and all other matters under the 2002 DOE-USEC Agreement continued to be preserved, and that the time limits for each party to respond to any missed milestones continue to be tolled.

Piketon Facility Costs and D&D Obligations

Effective October 1, 2015, the U.S. government discontinued funding of the American Centrifuge demonstration cascade at Piketon. Funding for American Centrifuge is now limited to research and development work at the Company’s facilities in Oak Ridge, Tennessee. As a result of reduced program funding, Centrus incurred a special charge in the third quarter of 2015 for estimated employee termination benefits, and began reductions in force. Refer to Note 2, Special Charges, for details. Centrus began to incur expenditures in the second quarter of 2016 associated with the D&D of the Piketon facility in accordance with the requirements of the NRC and DOE. Centrus leases the Piketon facility from DOE. At the conclusion of the lease, Centrus is obligated to return the facility to DOE in a condition that meets NRC requirements and in the same condition as the facility was in when it was leased to Centrus (other than due to normal wear and tear). Centrus must remove all Company-owned capital improvements at the Piketon facility, unless otherwise consented to by DOE, by the conclusion of the lease term. The lease will expire on June 30, 2019, unless it is extended. The D&D work is expected to extend through 2017 and be substantially completed by year-end. As of March 31, 2017, Centrus has accrued $34.9 million on the balance sheet as Decontamination and Decommissioning Obligations for the estimated fair value of the remaining costs to complete the D&D work.

Centrus is required to provide financial assurance to the NRC and DOE for D&D costs under a regulatorily-prescribed methodology that includes potential contingent costs and reserves. As of March 31, 2017, Centrus has provided financial assurance to the NRC and DOE in the form of surety bonds totaling $29.6 million, which are fully cash collateralized by Centrus. Centrus expects to receive cash when surety bonds are reduced and/or cancelled as the Company fulfills its D&D and lease obligations.