Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENTS As previously disclosed in our Current Report on Form 8-K filed on December 31, 2020, on that same date the Company entered into an At Market Sales Agreement (the “Sales Agreement”) with B. Riley Securities, Inc. and Lake Street Capital Markets, LLC (the “Agents”), relating to the at the market offering (the “ATM Offering”) of shares of the Company’s Class A Common Stock, $0.10 par value per share. Mr. Williams, Chairman of the Centrus Board of Directors, also serves on the board of B. Riley Financial, Inc. Mr. Williams recused himself and took no part in the selection of B. Riley or the negotiation of the terms of the Sales Agreement. The shares of Class A Common Stock were issued pursuant to the Company’s shelf registration statement on Form S-3 (File No. 333-239242), which became effective on August 5, 2020, and a prospectus supplement dated December 31, 2020 to the prospectus, dated August 5, 2020. Pursuant to the Sales Agreement, as of March 22, 2021, the Company has sold an aggregate of 1,015,211 shares of its Class A Common Stock at an average price of $22.96 for a total of $23,312,963. After expenses and commissions paid to the Agents the Company received $22,379,629. The Company currently intends to use the net proceeds from the ATM Offering for general working capital purposes, to invest in technology development and to repay outstanding debt or retire shares of its Series B Senior Preferred Stock. As previously disclosed, the Company had submitted a claim to the U.S. Department of Energy (the “DOE”) under the Contract Disputes Act for payment of $42.8 million, representing the DOE’s share of pension and postretirement benefits costs related to the transition of employees at the former Portsmouth, Ohio Gaseous Diffusion Plant to the DOE’s decontamination and decommissioning contractor. As previously disclosed in our Current Report on Form 8-K filed on January 14, 2021, on January 13, 2021, the Company and the DOE reached a tentative agreement to settle the litigation. The settlement is subject to the approval of the DOE, the U.S. Department of Justice, the Company’s Board of Directors, and the Court. If the settlement is ultimately approved by all parties, the DOE is expected to pay the Company $43.5 million (inclusive of any interest due). The Company can give no assurance whether or when the tentative settlement will receive the required approvals or whether the Company will ultimately recover some, all or none of the proposed settlement amount. For further information refer to Note 17, Commitments and Contingencies - Legal Matters. As previously disclosed in our Current Report on Form 8-K filed February 5, 2021, on February 2, 2021 the Company entered into an amendment to its existing Voting and Nomination Agreement with Mr. Morris Bawabeh, Kulayba LLC and M&D Bawabeh Foundation, Inc. (collectively, the “MB Group”) and an Exchange Agreement (as described below) whereby the MB Group agreed to support management’s recommendation on certain matters at the Company’s 2021 annual meeting of stockholders (the “Annual Meeting”) and Kulayba LLC agreed to exchange shares of the Company’s Series B Senior Preferred Stock, par value $1.00 per share (“Preferred Stock”) for shares of the Company’s Class A Common Stock, par value $0.10 per share (“Common Stock”) and a warrant to acquire additional shares of Common Stock. Pursuant to the First Amendment to the Voting and Nomination Agreement, the MB Group agreed to cause all shares of Common Stock owned of record or beneficially owned by the MB Group at the Annual Meeting to be voted in favor of (i) an amendment to extend the length of the term of the Company’s Section 382 Rights Agreement dated as of April 6, 2016, as amended to date, for two years from June 30, 2021 to June 30, 2023 and (ii) an increase of shares of Common Stock reserved for delivery under the Company’s Centrus Energy Corp 2014 Equity Incentive Plan, as amended to date, of an additional 700,000 shares of Common Stock. In connection with the entry into the Voting Agreement Amendment, the Company and Kulayba LLC also entered into an Exchange Agreement, dated February 2, 2021 (the “Exchange Agreement”), pursuant to which Kulayba LLC agreed to exchange (the “Exchange”) 3,873 shares of Preferred Stock, representing a $5,000,198 liquidation preference (including accrued and unpaid dividends), for (i) 231,276 shares of Common Stock priced at the closing market price of $21.62 on the date the Exchange Agreement was signed and (ii) a Centrus Energy Corp. Warrant to Purchase Common Stock (the “Warrant”), exercisable for 250,000 shares of Common Stock at an exercise price of $21.62 per share, which was the closing market price on the date the Exchange Agreement was signed, subject to certain customary adjustments pursuant to the terms of the Warrant. The Warrant is exercisable by Kulayba LLC for a period commencing on the closing date of the Exchange and ending, unless sooner terminated as provided in the Warrant, on the first to occur of: (a) the second anniversary of the closing date of the Exchange or (b) the last business day immediately prior to the consummation of a Fundamental Transaction (as defined in the Warrant) which results in the shareholders of the Company immediately prior to such Fundamental Transaction owning less than 50% of the voting equity of the surviving entity immediately after the consummation of the Fundamental Transaction. The Company retired the 3,873 shares of Preferred Stock received by the Company under the Exchange Agreement.