Centrus Energy (LEU) 10-Q 14 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document and Entity Information	'	'
Entity Registrant Name	'CENTRUS ENERGY CORP	'
Entity Central Index Key	'0001065059	'
Current Fiscal Year End Date	'--12-31	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Entity Filer Category	'Smaller Reporting Company	'
Entity Common Stock, Shares Outstanding	'	9,000,000
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current Liabilities	'	'	'	'
Convertible senior notes (Predecessor)	'	$530	'	'
Convertible preferred stock (Predecessor), 85,900 shares issued	113.9	'	'	'
Long-term debt	240.4	'	'	'
Liabilities subject to compromise	662.9	'	'	'
Retained earnings (deficit)	0	'	'	'
Treasury stock	0	'	'	'
Accumulated other comprehensive income (loss), net of tax	0	'	'	'
Predecessor [Member]	'	'	'	'
Current Assets	'	'	'	'
Cash and cash equivalents	105.4	314.2	128.4	292.9
Accounts receivable	'	163	'	'
Inventories	'	967.6	'	'
Deferred costs associated with deferred revenue	'	165.5	'	'
Other current assets	'	21.7	'	'
Total current assets	'	1,632	'	'
Property, plant and equipment, net	'	7.9	'	'
Deferred income taxes	'	0	'	'
Deposits for surety bonds	'	39.8	'	'
Intangible assets	'	0	'	'
Excess reorganization value	'	0	'	'
Other long-term assets	'	25.8	'	'
Total Assets	'	1,705.50	'	'
Current Liabilities	'	'	'	'
Accounts payable and accrued liabilities	'	114.5	'	'
Payables under Russian Contract	'	340.7	'	'
Deferred income taxes	'	0	'	'
Inventories owed to customers and suppliers	'	499.7	'	'
Deferred revenue	'	195.9	'	'
Convertible senior notes (Predecessor)	'	530	'	'
Convertible preferred stock (Predecessor), 85,900 shares issued	'	113.9	'	'
Total current liabilities	'	1,794.70	'	'
Long-term debt	'	0	'	'
Postretirement health and life benefit obligations	'	195	'	'
Pension benefit liabilities	'	121.2	'	'
Other long-term liabilities	'	52.8	'	'
Total liabilities	'	2,163.70	'	'
Commitments and contingencies (Note 19)	'	'	'	'
Common stock	'	0.5	'	'
Excess of capital over par value	'	1,216.40	'	'
Retained earnings (deficit)	'	-1,520.70	'	'
Treasury stock	'	-34.3	'	'
Accumulated other comprehensive income (loss), net of tax	'	-120.1	'	'
Total stockholders’ equity (deficit)	59.3	-458.2	-462.1	-472.9
Total Liabilities and Stockholders’ Equity (Deficit)	'	1,705.50	'	'
Successor [Member]	'	'	'	'
Current Assets	'	'	'	'
Cash and cash equivalents	105.4	'	'	'
Accounts receivable	90	'	'	'
Inventories	499.4	'	'	'
Deferred costs associated with deferred revenue	0	'	'	'
Other current assets	21.6	'	'	'
Total current assets	716.4	'	'	'
Property, plant and equipment, net	3.7	'	'	'
Deferred income taxes	26.4	'	'	'
Deposits for surety bonds	35.9	'	'	'
Intangible assets	123.5	'	'	'
Excess reorganization value	137.2	'	'	'
Other long-term assets	20.5	'	'	'
Total Assets	1,063.60	'	'	'
Current Liabilities	'	'	'	'
Accounts payable and accrued liabilities	79.5	'	'	'
Payables under Russian Contract	47.3	'	'	'
Deferred income taxes	26.4	'	'	'
Inventories owed to customers and suppliers	173.1	'	'	'
Deferred revenue	0.7	'	'	'
Convertible senior notes (Predecessor)	0	'	'	'
Convertible preferred stock (Predecessor), 85,900 shares issued	0	'	'	'
Total current liabilities	327	'	'	'
Long-term debt	240.4	'	'	'
Postretirement health and life benefit obligations	211.6	'	'	'
Pension benefit liabilities	174.1	'	'	'
Other long-term liabilities	51.2	'	'	'
Liabilities subject to compromise	0	'	'	'
Total liabilities	1,004.30	'	'	'
Commitments and contingencies (Note 19)	'	'	'	'
Common stock	0.9	'	'	'
Excess of capital over par value	58.4	'	'	'
Retained earnings (deficit)	0	'	'	'
Total stockholders’ equity (deficit)	59.3	'	'	'
Total Liabilities and Stockholders’ Equity (Deficit)	$1,063.60	'	'	'

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Dec. 31, 2013	Sep. 30, 2014
	Predecessor [Member]	Successor [Member]
Preferred Stock, Par or Stated Value Per Share	$1	$1
Preferred Stock, Shares Authorized	25,000,000	20,000,000
Preferred Stock, Shares Issued	85,900	'
Common Stock, Par or Stated Value Per Share	$0.10	$0.10
Common Stock, Shares Authorized	25,000,000	100,000,000
Common Stock, Shares, Issued	5,211,000	9,000,000
Treasury Stock, Shares	226,000	'

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:	'	'	'	'
Separative work units	$97.40	$295.80	$347.50	$853.40
Uranium	0	3.8	0	45.3
Contract services	23.3	4.2	43	10.3
Total revenue	120.7	303.8	390.5	909
Cost of Sales:	'	'	'	'
Advanced technology costs	5.3	'	12.3	'
Special charges for workforce reductions and advisory costs	'	'	2.1	'
Reorganization items, net	-440	'	-426.9	'
Net income (loss)	418.9	-44.3	340.1	-87.2
Income (loss) from continuing operations - per basic share	$85.49	($9.04)	$69.41	($22.22)
Income (loss) from continuing operations - per diluted share	$55.51	($9.04)	$45.93	($22.22)
Net income (loss) per basic share	$85.49	($9.04)	$69.41	($17.79)
Net income (loss) per diluted share	$55.51	($9.04)	$45.93	($17.79)
Weighted-average number of shares outstanding:	'	'	'	'
Weighted average number of shares outstanding - basic	5	5	5	5
Weighted average number of shares outstanding - diluted	7.6	4.9	7.6	4.9
Predecessor [Member]	'	'	'	'
Revenue:	'	'	'	'
Separative work units	97.4	295.8	347.5	853.4
Uranium	0	3.8	0	45.3
Contract services	23.3	4.2	43	10.3
Total revenue	120.7	303.8	390.5	909
Cost of Sales:	'	'	'	'
Separative work units and uranium	103.3	330.4	369.4	962.4
Contract services	22.8	3.4	43.9	10.2
Total cost of sales	126.1	333.8	413.3	972.6
Gross profit (loss)	-5.4	-30	-22.8	-63.6
Advanced technology costs	5.3	44.5	56.6	150
Selling, general and administrative	10.4	11.2	32.2	36
Special charges for workforce reductions and advisory costs	0.1	3.5	2.1	9.6
Other (income)	-4.8	-35.9	-39.4	-124.2
Operating (loss)	-16.4	-53.3	-74.3	-135
Interest expense	4.7	9.5	14	32.1
Interest (income)	-0.1	0	-0.5	-0.4
Reorganization items, net	-440	0	-426.9	0
Income (loss) from continuing operations before income taxes	419	-62.8	339.1	-166.7
Provision (benefit) for income taxes	0.1	-18.5	-1	-57.8
Income (loss) from continuing operations	418.9	-44.3	340.1	-108.9
Income from discontinued operations	0	0	0	21.7
Net income (loss)	$418.90	($44.30)	$340.10	($87.20)
Income (loss) from continuing operations - per basic share	$85.49	($9.04)	$69.41	($22.22)
Income (loss) from continuing operations - per diluted share	$55.51	($9.04)	$45.93	($22.22)
Net income (loss) per basic share	$85.49	($9.04)	$69.41	($17.79)
Net income (loss) per diluted share	$55.51	($9.04)	$45.93	($17.79)
Weighted-average number of shares outstanding:	'	'	'	'
Weighted average number of shares outstanding - basic	4.9	4.9	4.9	4.9
Weighted average number of shares outstanding - diluted	7.6	4.9	7.6	4.9

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income (loss)	$418.90	($44.30)	$340.10	($87.20)
Predecessor [Member]	'	'	'	'
Net income (loss)	418.9	-44.3	340.1	-87.2
Gain arising during the period	0	0	0	138.3
Curtailment (gain) recognized in net income	-2.2	0	-2.2	0
Amortization of actuarial (gains) losses, net	0.3	2.6	0.9	15.5
Amortization of prior service costs (credits)	-0.1	0	-0.3	0.7
Other comprehensive income (loss), before tax	-2	2.6	-1.6	154.5
Income tax expense related to items of other comprehensive income	0.1	-1.5	0	-58
Other comprehensive income (loss), net of tax	-1.9	1.1	-1.6	96.5
Elimination of Predecessor Company accumulated other comprehensive loss	121.7	0	121.7	0
Comprehensive income (loss)	538.7	-43.2	460.2	9.3
Accumulated Other Comprehensive Income (Loss) [Member] | Predecessor [Member]	'	'	'	'
Net income (loss)	'	'	$0	$0

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash Flows from Operating Activities	'	'
Net income (loss)	$340.10	($87.20)
Predecessor [Member]	'	'
Cash Flows from Operating Activities	'	'
Net income (loss)	340.1	-87.2
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:	'	'
Depreciation and amortization	4.2	22.8
Reorganization items, non-cash	-442.5	0
Transfers and retirements of machinery and equipment	0	19.3
Convertible preferred stock dividends payable-in-kind	0	9.9
Gain on sales of assets and subsidiary	-5.7	-35.6
Inventory valuation adjustments	0	15
Changes in operating assets and liabilities:	'	'
Accounts receivable – (increase) decrease	79	-23.9
Inventories, net – (increase) decrease	177	-72.7
Payables under Russian Contract – increase (decrease)	-293.4	115
Deferred revenue, net of deferred costs – increase (decrease)	-9.7	17.6
Accrued depleted uranium disposition - increase (decrease)	-0.6	0.3
Accounts payable and other liabilities – (decrease)	-65.8	-80.4
Other, net	-2.9	-4.7
Net Cash (Used in) Operating Activities	-220.3	-104.6
Cash Flows Provided by Investing Activities	'	'
Deposits for surety bonds - net (increase) decrease	3.9	-17.5
Proceeds from sales of assets and subsidiary	8.4	43.2
Net Cash Provided by Investing Activities	12.3	25.7
Cash Flows Used in Financing Activities	'	'
Repayment of credit facility term loan	0	-83.2
Payments for deferred financing costs	-0.7	-2.2
Common stock issued (purchased), net	-0.1	-0.2
Net Cash (Used in) Financing Activities	-0.8	-85.6
Net (Decrease)	-208.8	-164.5
Cash and Cash Equivalents at Beginning of Period	314.2	292.9
Cash and Cash Equivalents at End of Period	105.4	128.4
Supplemental Cash Flow Information:	'	'
Interest paid	15.9	20.7
Income taxes paid, net of refunds	$0	$0.40

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)

Total

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Predecessor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

Successor [Member]

In Millions

Common Stock Par Value $.10 per Share [Member]

Excess of Capital over Par Value [Member]

Retained Earnings (Deficit) [Member]

Treasury Stock [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Common Stock Par Value $.10 per Share [Member]

Excess of Capital over Par Value [Member]

Retained Earnings (Deficit) [Member]

Treasury Stock [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Beginning Balance at Dec. 31, 2012

'

($472.90)

$0.50

$1,213.30

($1,361.80)

($33)

($291.90)

'

'

'

'

'

'

Other comprehensive income, net of tax (Note 20)

'

96.5

0

0

0

0

96.5

'

'

'

'

'

'

Restricted and other common stock issued, net of amortization

'

1.5

0

2.9

0

-1.4

0

'

'

'

'

'

'

Net income (loss)

-87.2

-87.2

0

0

-87.2

0

0

'

'

'

'

'

'

Ending Balance at Sep. 30, 2013

'

-462.1

0.5

1,216.20

-1,449

-34.4

-195.4

'

'

'

'

'

'

Beginning Balance at Jun. 30, 2013

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

-44.3

-44.3

'

'

'

'

'

'

'

'

'

'

'

Ending Balance at Sep. 30, 2013

'

-462.1

'

'

'

'

'

'

'

'

'

'

'

Beginning Balance at Dec. 31, 2013

'

-458.2

0.5

1,216.40

-1,520.70

-34.3

-120.1

'

'

'

'

'

'

Other comprehensive income, net of tax (Note 20)

'

-1.6

0

0

0

0

-1.6

'

'

'

'

'

'

Restricted and other common stock issued, net of amortization

'

1

0

1.1

0

-0.1

0

'

'

'

'

'

'

Restricted Stock Award, Forfeitures

'

0

0

4.4

0

-4.4

'

'

'

'

'

'

'

Net income (loss)

340.1

340.1

0

0

340.1

0

0

'

'

'

'

'

'

Elimination of Predecessor Company equity

'

118.7

-0.5

-1,221.90

1,180.60

38.8

121.7

'

'

'

'

'

'

Issuance of Successor Company common stock and excess of capital over par value

'

59.3

0.9

58.4

0

0

0

'

'

'

'

'

'

Ending Balance at Sep. 30, 2014

'

59.3

0.9

58.4

0

0

0

59.3

0.9

58.4

0

0

0

Beginning Balance at Jun. 30, 2014

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income (loss)

418.9

418.9

'

'

'

'

'

'

'

'

'

'

'

Ending Balance at Sep. 30, 2014

'

$59.30

'

'

'

'

'

$59.30

$0.90

$58.40

$0

$0

$0

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	BASIS OF PRESENTATION
	On March 5, 2014, USEC Inc. filed a voluntary petition for relief (the "Bankruptcy Filing") under Chapter 11 of Title 11 of the United States Code (the "Bankruptcy Code") in the United States Bankruptcy Court for the District of Delaware (the "Bankruptcy Court"). The Bankruptcy Filing was "pre-arranged" and included the filing of a proposed Plan of Reorganization (the "Plan") supported by certain holders of the claims and interests impaired under the reorganization plan. On August 18, 2014, the Company announced that the Plan was accepted by more than 99 percent in both value and number of votes cast of holders of its convertible notes and that both holders of the Company’s preferred equity voted in favor of the Plan. On September 5, 2014, the Bankruptcy Court entered an order approving and confirming the Plan. On September 30, 2014 (the "Effective Date"), the Company satisfied the conditions of the Plan and the Plan became effective. On the Effective Date, USEC Inc.’s name was changed to Centrus Energy Corp. ("Centrus" or the "Company").
	The Bankruptcy Filing was intended to strengthen the Company’s balance sheet, improve its long-term business prospects and address a very specific and impending debt maturity. With the successful conclusion of the balance sheet restructuring, the Company achieved (a) a 55% reduction in the amount of third party debt obligations outstanding and the elimination of all shares of convertible preferred stock; (b) an extension of maturity payments for at least five years, and potentially another five years if certain conditions are met, as a result of the cancellation of its former debt and issuance of new debt; and (c) a reduction in the annual cash interest burden, as a result of the cancellation of its former debt and issuance of new debt, which has a pay in-kind interest feature. Furthermore, the new debt contains minimal covenants that will not constrain Centrus from managing and operating its business in the normal course.
	The benefits of the balance sheet restructuring also provide stability and continuity for Centrus’ low enriched uranium ("LEU") commercial operations, conducted primarily through its wholly owned subsidiary United States Enrichment Corporation ("Enrichment Corp."). Moving forward, Centrus expects to continue Enrichment Corp.'s operations by selling its current inventory quantities, as well as commercial LEU purchased from Russia and from other suppliers, to customers under contract and through new commercial sales.
	With the successful conclusion of the balance sheet restructuring, Centrus has substantially reduced its leverage and extended maturity payments for at least five years. Centrus expects to comply with the covenants contained in the indenture governing its new debt. Having successfully implemented the Plan and emerged from bankruptcy on the Effective Date, Centrus anticipates having adequate liquidity for at least the next 12 months. As a result of these factors, management believes there is no longer substantial doubt regarding the Company’s ability to continue as a going concern.
	In accordance with Accounting Standards Codification Topic 852, "Reorganizations", Centrus adopted fresh start accounting upon emergence from Chapter 11 bankruptcy resulting in Centrus becoming a new entity for financial reporting purposes. References to "Successor" or "Successor Company" relate to the financial position of the reorganized Centrus as of September 30, 2014. References to “Predecessor” or "Predecessor Company" refer to the financial position of the Company prior to September 30, 2014 and the results of operations through September 30, 2014. As a result of the application of fresh start accounting and the effects of the implementation of the Plan, the financial statements on or after September 30, 2014 are not comparable with the financial statements prior to that date. Refer to Note 3, "Fresh Start Accounting", for additional information.
	Expenses, gains and losses directly associated with reorganization proceedings are reported as Reorganization Items, Net, in the accompanying Condensed Consolidated Statement of Operations.
	The unaudited condensed consolidated financial statements of Centrus as of and for the three and nine months ended September 30, 2014 and 2013 have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). The unaudited condensed consolidated financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the financial results for the interim period. Certain information and notes normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("GAAP") have been omitted pursuant to such rules and regulations. All material intercompany transactions are eliminated. Certain amounts in the condensed consolidated financial statements have been reclassified to conform to the current presentation.
	In March 2013, the Company’s wholly owned subsidiary NAC International, Inc. ("NAC") was acquired by Hitz Holdings U.S.A. Inc., a subsidiary of Hitachi Zosen Corporation. The Company recorded a gain on the sale of $35.6 million in the first quarter of 2013. Results for NAC through the date of divestiture of March 15, 2013 are segregated from continuing operations and reported as discontinued operations.
	Operating results for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014.
	The unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes and Management's Discussion and Analysis of Financial Condition and Results of Operations included in the Annual Report on Form 10-K for the year ended December 31, 2013.
	New Accounting Standards
	In July 2013, the Financial Accounting Standards Board ("FASB") issued guidance requiring an entity to present unrecognized tax benefits as a reduction to deferred tax assets when a net operating loss carryforward, similar tax loss or a tax credit carryforward exists, with limited exceptions. This pronouncement was effective beginning in the first quarter of 2014. The Company has historically presented uncertain tax positions in accordance with the new guidance and the implementation of the guidance did not have a material impact on its consolidated financial statements.
	In April 2014, the FASB issued amendments to guidance for reporting discontinued operations and disposals of components of an entity. The amended guidance changes the definition of a discontinued operation to include only those disposals of components of an entity that represent a strategic shift that has, or will have, a major effect on an entity’s operations and financial results. The amendments also expand the disclosure requirements for discontinued operations and add new disclosures for individually significant dispositions that do not qualify as discontinued operations. The amendments are effective prospectively beginning in the first quarter of 2015 (early adoption is permitted only for disposals that have not been previously reported). The implementation of the amended guidance is not expected to have a material impact on Centrus' results of operations, cash flows or financial position.
	In May 2014, the FASB issued comprehensive new guidance for revenue recognition. The core principle of the new standard is that revenue should be recognized when an entity transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The new standard will supersede current guidance in effect and may require the use of more judgment and estimates, including estimating the amount of variable revenue to recognize over each identified performance obligation. The new standard requires additional disclosures to describe the nature, amount and timing of revenue and cash flows arising from contracts. The new standard will become effective for Centrus beginning with the first quarter of 2017 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. Centrus is evaluating the impact of adopting this new guidance on its consolidated financial statements.
	In August 2014, the FASB issued guidance which will require management to evaluate whether there is substantial doubt about the entity’s ability to continue as a going concern for 12 months following the issuance of the financial statements. In the event there is substantial doubt, the guidance requires disclosure of the relevant facts and circumstances. This standard is effective for annual reporting periods beginning after December 15, 2016, and interim periods thereafter. Early adoption is permitted. Centrus does not expect this standard will have a significant impact on its consolidated financial statements or disclosures.

Energence_From_Voluntary_Reorg

Energence From Voluntary Reorganization Under Chapter 11 Proceedings Energence From Voluntary Reorganization Under Chapter 11 Proceedings (Text Block)	9 Months Ended
	Sep. 30, 2014
Chapter 11 Filing [Abstract]	'
Reorganization under Chapter 11 of US Bankruptcy Code Disclosure	'
	EMERGENCE FROM VOLUNTARY REORGANIZATION UNDER CHAPTER 11 PROCEEDINGS
	Pursuant to the Plan, on the Effective Date, all shares of USEC Inc.’s common stock, $0.10 par value per share (the "Old Common Stock"), all shares of USEC Inc.’s Series B-1 12.75% convertible preferred stock, $1.00 par value per share (the "Old Preferred Stock"), and all of USEC Inc.’s 3% convertible senior notes due October 2014 (the "Old Notes") that were issued and outstanding immediately prior to the Effective Date were cancelled.
	On the Effective Date and pursuant to the Plan, the Company issued 8% Paid-In-Kind ("PIK") toggle notes due 2019/2024 (the "New Notes"). The New Notes will mature in 2019; provided that, the Company has the right to extend the maturity to 2024 upon the occurrence of certain conditions set forth in the Indenture governing the New Notes entered into by the Company, Enrichment Corp., as guarantor and Delaware Trust Company, as trustee and collateral agent (the "Indenture"). The New Notes have an initial aggregate principal amount of $240.4 million; provided that, the aggregate principal amount of the New Notes may be increased after the date of issuance as a result of any payment of interest on the New Notes in the form of PIK interest. The New Notes are guaranteed and secured on a subordinated and limited basis by Enrichment Corp. Additional details are provided in Note 12, "Debt".
	On the Effective Date and pursuant to the Plan, the Company's Certificate of Incorporation was amended and restated to authorize 120,000,000 shares of stock in the reorganized Company, consisting of 20,000,000 shares of preferred stock, par value $1.00 per share (the "New Preferred Stock"), 70,000,000 shares of Class A common stock, $0.10 par value per share (the “Class A Common Stock”) and 30,000,000 shares of Class B common stock, $0.10 par value per share (the “Class B Common Stock” and, together with the Class A Common Stock, the “New Common Stock”). On the Effective Date and pursuant to the Plan, the Company issued 9,000,000 shares of New Common Stock. Additional details are provided in Note 15, "Stockholders' Equity". The issuance of the Class A Common Stock and Class B Common Stock under the Plan was not registered with the SEC. The Class A Common Stock and Class B Common Stock were issued in reliance on exemptions under the Securities Act of 1933, as amended (the "Securities Act") provided by Section 1145 of the Bankruptcy Code.
	No cash was raised from the issuance of the New Notes or New Common Stock.
	The material terms of the Plan included, among other things, that upon the Effective Date:
	•	The holders of the Old Notes received, on a pro rata basis, in exchange for claims on account of their $530 million in outstanding principal amount of Old Notes:
	◦	79.04% of the New Common Stock, subject to dilution on account of a new management incentive plan;
	◦	cash for interest payable on the Old Notes accrued from October 1, 2013, the date of the last semi-annual interest payment, to the Effective Date, totaling $15.9 million; and
	◦	$200 million in principal amount of New Notes.
	•	Babcock & Wilcox Investment Company ("B&W") and Toshiba America Nuclear Energy Corporation ("Toshiba") each received, in exchange and on account of their shares of Old Preferred Stock (as of December 31, 2013, there were 85,903 shares of Old Preferred Stock outstanding with an aggregate liquidation preference of $113.9 million including accrued paid-in-kind dividends) and warrants dated September 2, 2010 to purchase up to 250,000 shares of USEC’s Old Common Stock (the "Warrants"):
	◦	7.98% of the New Common Stock (15.96% in the aggregate), subject to dilution on account of a new management incentive plan; and
	◦	$20.19 million in principal amount of New Notes ($40.38 million in the aggregate).
	•	B&W and Toshiba have agreed to enter into good faith negotiations to each invest $20.19 million (for an aggregate investment of $40.38 million) of equity in the American Centrifuge project in the future, upon mutually agreed upon terms and conditions, but in any event contingent upon the funding for the American Centrifuge Plant ("ACP") of not less than $1.5 billion of debt supported by the U.S. Department of Energy ("DOE") loan guarantee program or other government support or funding in such amount.
	•	The Class B Common Stock issued to B&W and Toshiba has the same rights, powers, preferences and restrictions and ranks equally in all matters with the Class A Common Stock issued to former holders of the Old Notes, except voting. Holders of the Class B Common Stock are entitled to elect, in the aggregate, two members of the Board of Directors of Centrus Energy Corp., subject to certain holding requirements and other restrictions as described in the Amended and Restated Centrus Energy Corp. Certificate of Incorporation.
	•	The former holders of Old Common Stock received, on a pro rata basis, 5% of the Class A Common Stock, subject to dilution on account of a new management incentive plan.
	•	All secured claims were reinstated and otherwise not impaired and all liens were continued until the claims are paid in full.
	•	All other general unsecured claims of the Company were unimpaired and were either reinstated or paid in full in the ordinary course of business upon the later of the Effective Date or when such obligation becomes due according to its terms.
	•	On the Effective Date, Centrus Energy Corp. obtained a new secured intercompany financing of $48.0 million from Enrichment Corp. (the "Intercompany Note") to provide funds necessary to make payments of $35.3 million required under the Plan, as well as $12.7 million available for working capital and other general corporate purposes of the Company. Payments required under the Plan included the repayment of borrowings under the former debtor-in-possession credit facility from Enrichment Corp. (the “DIP Facility”) of $16.3 million, interest payments of $15.9 million to former holders of the Old Notes, as described above, and $3.1 million in professional fees and other expenses.
	Additional details regarding the Intercompany Note and former DIP Facility are provided in Note 12, "Debt".

Fresh_Start_Accounting_Notes

Fresh Start Accounting (Notes)	9 Months Ended
	Sep. 30, 2014
Fresh Start Accounting [Abstract]	'
Fresh Start Accounting [Text Block]	'
	FRESH START ACCOUNTING
	Upon the Company’s emergence from Chapter 11 bankruptcy, Centrus applied the provisions of fresh start accounting to its financial statements as (i) the holders of existing voting shares of the Predecessor Company received less than 50% of the voting shares of the emerging entity and (ii) the reorganization value of Centrus’ assets immediately prior to confirmation was less than the post-petition liabilities and allowed claims. Centrus applied fresh start accounting as of September 30, 2014, with results of operations and cash flows in the period ending September 30, 2014 attributed to the Predecessor Company.
	Upon the application of fresh start accounting, Centrus allocated the reorganization value to its individual assets based on their estimated fair values. Reorganization value represents the fair value of the Successor Company’s assets before considering liabilities, and the excess of reorganization value over the fair value of identified tangible and intangible assets is reported separately on the Condensed Consolidated Balance Sheet.
	Centrus, with the assistance of external valuation specialists, has estimated the enterprise value of the Company to be in a range of $294 million to $306 million. Based on the estimates and assumptions used in determining the enterprise value, as further discussed below, Centrus estimated the enterprise value to be $299.7 million as of September 30, 2014. Enterprise value is defined as the total invested capital which includes cash and cash equivalents. The estimate is based on a calculation of the present value of the future cash flows of the Company based on its projections from October 1, 2014 through the year ending December 31, 2022, including a projected December 31, 2022 net asset value. The Company’s future cash flow projections included a variety of estimates and assumptions that had a significant effect on the determination of the Company’s enterprise value. While the Company considers such estimates and assumptions reasonable, they are inherently subject to significant business, economic and competitive uncertainties, many of which are beyond the Company’s control and, therefore, may not be realized. The assumptions used in the calculations for the discounted cash flow analysis included the following: forecasted revenue, costs and free cash flows through 2022, and a discount rate of 9.0% that considered various factors, including bonds yields, risk premiums and tax rates to determine a weighted-average cost of capital. For purposes of the enterprise valuation, no terminal value was used. Rather, the present value of the net asset value at December 31, 2022 was determined using the discount rate of 10.0%.
	The four-column condensed consolidated balance sheet provided below applies the effects of the Plan and fresh start accounting to the carrying values and classifications of assets or liabilities as of September 30, 2014. Upon adoption of fresh start accounting, the recorded amounts of assets and liabilities were adjusted to reflect their estimated fair values. Accordingly, the reported historical financial statements of the Predecessor Company prior to the adoption of fresh start accounting for periods ended on or prior to September 30, 2014 are not comparable to those of the Successor Company.
	In applying fresh start accounting, the Company followed these principles:
	•	The reorganization value, which represents the enterprise value and non-interest bearing liabilities, was allocated to the Successor Company's assets based on their estimated fair values. The reorganization value exceeded the sum of the fair value assigned to assets. This excess reorganization value was recorded as part of the Successor Company assets at September 30, 2014.
	•	Each liability existing as of the fresh start accounting date, other than deferred taxes and pension and other postretirement benefit obligations, has been stated at the fair value, and determined at appropriate risk adjusted interest rates.
	•	Deferred taxes were reported in conformity with applicable income tax accounting standards. Deferred tax assets and liabilities have been recognized for differences between the assigned values and the tax basis of the recognized assets and liabilities.
	•	The actuarial value of pension and other postretirement benefit obligations were determined based on applicable retirement benefits standards.
	The following table reconciles the enterprise value to the estimated fair value of Successor Company's New Common Stock as of the Effective Date (in millions, except per share data):
	Enterprise value	$	299.7
	Less: Fair value of debt	240.4
	Fair value of Successor common stock	$	59.3
	Shares outstanding at September 30, 2014	9
	Per share value	$	6.59
	The following table reconciles the enterprise value to the estimated reorganization value as of the Effective Date (in millions):
	Enterprise value	$	299.7
	Plus non-debt liabilities	763.9
	Reorganization value of Successor assets	$	1,063.60
	The fair value of non-debt liabilities represents the total assumed liabilities of the Successor Company on the Effective Date less the fair value of the debt.
	Upon the adoption of fresh start accounting, the Successor Company adopted the significant accounting policies of the Predecessor Company, as disclosed in the Predecessor Company’s audited financial statements for the year ended December 31, 2013, with the exception of its accounting policy for pension and postretirement benefit plans. Historically, the Company recognized the actuarial gains and losses as a component of stockholders’ equity on an annual basis and generally amortized them into operating results over the average future service period of the active employees of these plans. On a prospective basis, the Successor Company has modified its accounting policy to immediately recognize the actuarial gains and losses in the statement of operations in the period in which they arise, and the Successor Company expects to report such actuarial gains and losses on a separate line item. The immediate recognition in the statement of operations is intended to increase transparency into how movements in plan assets and benefit obligations impact financial results. Gains or losses different than annual expectations will be measured annually and recorded in the fourth quarter.
	The adjustments set forth in the following condensed consolidated balance sheet reflect the effect of the consummation of the transactions contemplated by the Plan (reflected in the column "Reorganization Adjustments") as well as fair value adjustments as a result of the adoption of fresh start accounting (reflected in the column "Fresh Start Adjustments").
	(in millions)	Predecessor Company, September 30, 2014			Reorganization Adjustments				Fresh Start Adjustments				Successor Company, September 30, 2014
	ASSETS
	Current Assets
	Cash and cash equivalents	$	124.4		$	(19.0	)	(a)	$	—			$	105.4
	Accounts receivable	90			—				—				90
	Inventories	464			—				35.4			(k)	499.4
	Deferred costs associated with deferred revenue	73.9			—				(73.9		)	(l)	—
	Other current assets	21.5			0.1			(b)	—				21.6
	Total current assets	773.8			(18.9		)		(38.5		)		716.4
	Property, plant and equipment	3.7			—				—				3.7
	Deferred taxes	—			—				26.4			(m)	26.4
	Deposits for surety bonds	35.9			—				—				35.9
	Intangible assets	—			—				123.5			(n)	123.5
	Excess reorganization value	—			—				137.2			(o)	137.2
	Other long-term assets	19.8			0.7			(c)	—				20.5
	Total Assets	$	833.2		$	(18.2	)		$	248.6			$	1,063.60
	LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
	Current Liabilities
	Accounts payable and accrued liabilities	$	67.3		$	4.9		(d)	$	7.3		(p)	$	79.5
	Payables under Russian Contract	47.3			—				—				47.3
	Deferred taxes	—			—				26.4			(m)	26.4
	Inventories owed to customers and suppliers	173.1			—				—				173.1
	Deferred revenue	94.7			—				(94.0		)	(l)	0.7
	Total current liabilities	382.4			4.9				(60.3		)		327
	Long-term debt	—			240.4			(e)	—				240.4
	Postretirement health and life benefit obligations	202.4			—				9.2			(p)	211.6
	Pension benefit liabilities	95.9			—				78.2			(p)	174.1
	Other long-term liabilities	51.2			—				—				51.2
	Total liabilities not subject to compromise	731.9			245.3				27.1				1,004.30
	Liabilities subject to compromise
	Convertible senior notes and accrued interest	547.4			(547.4		)	(f)	—				—
	Convertible preferred stock and PIK dividends payable	113.9			(113.9		)	(f)	—				—
	Accounts payable	1.6			(1.6		)	(f)	—				—
	Total liabilities subject to compromise	662.9			(662.9		)		—				—
	Total liabilities	1,394.80			(417.6		)		27.1				1,004.30
	Stockholders’ Equity (Deficit)
	Common stock (Predecessor)	0.5			—				(0.5		)	(q)	—
	Excess of capital over par value (Predecessor)	1,221.50			0.4			(g)	(1,221.9		)	(q)	—
	Treasury stock (Predecessor)	(38.8		)	—				38.8			(q)	—
	Accumulated other comprehensive loss, net of tax (Predecessor)	(119.5		)	(2.2		)	(h)	121.7			(q)	—
Common stock (Successor)	—			0.9			(i)	—				0.9
Excess of capital over par value (Successor)	—			58.4			(i)	—				58.4
Retained earnings (deficit)	(1,625.3		)	341.9			(j)	1,283.40			(q)	—
Total stockholders’ equity (deficit)	(561.6		)	399.4				221.5				59.3
Total Liabilities and Stockholders’ Equity (Deficit)	$	833.2		$	(18.2	)		$	248.6			$	1,063.60
Reorganization Adjustments
(a)	The cash payments recorded on the Effective Date from implementation of the Plan include the following (in millions):
Payment of claims for interest payable on the Old Notes at the non-default rate	$	15.9
Payment of professional fees	1.5
Payment of unsecured pre-petition claims	1.6
Net decrease in cash	$	19
(b)	Represents payment in advance of the fees and expenses for the trustee and collateral agent for the New Notes issued at the Effective Date.
(c)	Represents $0.7 million of debt issuance cost incurred on the New Notes. These costs will be amortized using the straight-line method, which approximates the effective interest method, over the life of the New Notes.
(d)	Primarily represents success fees accrued upon emergence from Chapter 11 bankruptcy that have been included in Reorganization Items, Net in the Condensed Consolidated Statements of Operations.
(e)	Adjustment reflects the issuance of the $240.4 million in New Notes to holders of the Old Notes and Old Preferred Stock.
(f)	The adjustment to liabilities subject to compromise relates to the extinguishment of the Old Notes, the Old Preferred Stock and unsecured general claims. The holders of Old Notes received New Notes, cash on interest accrued at the non-default rate to the Effective Date and New Common Stock. The holders of Old Preferred Stock received New Notes and Class B Common Stock. The holders of unsecured general claims received cash outlays on the Effective Date.
(g)	Represents the cancellation of the unamortized restricted stock and restricted stock units of the Predecessor Company.
(h)	Upon the Effective Date, the Company froze benefit accruals under the supplemental executive retirement plans (“SERP”). The $2.2 million adjustment reflects the curtailment related to the freeze of the benefits under these plans.
(i)	Pursuant to the Plan, the Company issued 9 million shares of New Common Stock. This adjustment records the Successor Company’s New Common Stock and additional paid in capital of $59.3 million, which represents the fair value of the New Common Stock for financial statement reporting purposes.
(j)	As a result of the Plan, the adjustment to the accumulated deficit equaled the gain on extinguishment of debt, offset by the issuance of the Successor Company’s New Notes, New Common Stock and cash payments as follows (in millions):
Extinguishment of Predecessor claims pursuant to the Plan:
Convertible senior notes and accrued interest	$	547.4
Convertible preferred stock and PIK dividends payable	113.9
Accounts payable	1.6
Total liabilities subject to compromise	$	662.9
Total consideration given pursuant to the Plan:
New Notes	$	(240.4	)
Issuance of 95% of New Common Stock to holders of Old Notes and Old Preferred Stock	(56.4		)
Cash payments for interest payable on Old Notes at the non-default rate	(15.9		)
Cash payments to holders of unsecured claims	(1.6		)
Total settlements on liabilities subject to compromise	$	(314.3	)
Gain on extinguishment of pre-petition liabilities	$	348.6
Other adjustments to accumulated deficit:
Benefit accrual freeze on SERP plans	$	2.2
Cancellation of restricted stock and restricted stock units	(0.4		)
Deferred financing costs	0.7
Professional fees accrued at the emergence	(6.3		)
Total other reorganization expenses	$	(3.8	)
Issuance of 5% of New Common Stock to holders of Old Common Stock	(2.9		)
Total adjustment to retained deficit (earnings)	$	341.9
Fresh Start Adjustments
(k)	Inventories were mainly valued using a net realizable value method which utilizes the expected selling prices to customers as a basis for valuing finished goods. An adjustment of $35.4 million was recorded to increase the book value of SWU inventories to fair value.
(l)	The adjustment reflects the elimination of deferred costs associated with deferred revenue and of the deferred revenue of $73.9 million and $94.0 million, respectively, resulting in a gain of $20.1 million recorded in Reorganization Items, Net, and the establishment of the remaining performance obligation of the Successor Company.
(m)	Reflects the tax effects of the fresh start adjustments at statutory tax rates applicable to such adjustments, net of adjustments to the valuation allowance.
(n)	The adjustment reflects the fair value of identifiable intangible assets of $123.5 million, determined as follows:
Backlog intangibles of $54.6 million were valued using the income approach, specifically the multi-period excess earnings approach based on the following significant assumptions:
•	Forecasted sales and profit margins associated with contracts in place for the period ranging from October 1, 2014 to December 31, 2022; and
•	Discount rate of 9.0%, based on the after-tax weighted-average cost of capital.
Customer relationships of $68.9 million were valued using the income approach, specifically the multi-period excess earnings approach based on the following significant assumptions:
•	Estimate of sales from existing customers representing 65% of projected non-contractual sales over the remaining economic life of the existing customers, which was comprised of a discrete forecast from October 1, 2014 to December 31, 2022 and an expectation of sales beyond 2022, in consideration of the identifiable customer base, sales experience, and forecast market demand;
•	Forecasted profit margins associated with the existing customer base for the period ranging from October 1, 2014 to December 31, 2022; and
•	Discount rate of 10.0%, based on the after-tax weighted-average cost of capital, adjusted for perceived business risk associated with this intangible asset.
(o)	The adjustment records the reorganization value of assets in excess of amounts allocated to identified tangible and intangible assets as follows (in millions).
Enterprise value	$	299.7
Add: Fair value of liabilities excluded from enterprise value	763.9
Less: Fair value of tangible assets	(802.9		)
Less: Fair value of identified intangible assets	(123.5		)
Reorganization value of Successor assets in excess of amounts allocated to identified tangible and intangible assets	$	137.2
(p)	The adjustment reflects an aggregate increase of $94.7 million in pension and postretirement benefit obligations based on a remeasurement at the Effective Date. The remeasurement of plan obligations include revised mortality rate and discount rate assumptions. Further details are provided in Note 14.
(q)	The Predecessor Company’s accumulated deficit and accumulated other comprehensive income is eliminated in conjunction with the adoption of fresh start accounting. Also, pursuant to the Plan, the Old Common Stock and related additional paid in capital were eliminated to retained earnings as all of the Predecessor Company equity interests were cancelled. The Predecessor Company recognized a gain of $99.8 million related to the fresh start accounting adjustments as follows (in millions):
Establishment of Successor Company’s excess reorganization value	$	137.2
Establishment of Successor Company’s other intangible assets	123.5
Inventory fair value adjustments	35.4
Deferred costs and deferred revenue fair value adjustments	20.1
Pension and postretirement remeasurement	(94.7		)
Gain on revaluation of assets and liabilities	$	221.5
Cancellation of accumulated other comprehensive income	(121.7		)
Total gain on fresh start accounting adjustments	$	99.8
Cancellation of Predecessor Company equity	1,183.60
Total adjustment to retained deficit (earnings)	$	1,283.40

Reorganization_Items_Net_Notes

Reorganization Items, Net (Notes)	9 Months Ended
	Sep. 30, 2014
Reorganizations Items, Net [Abstract]	'
Reorganization Items, Net [Text Block]	'
	REORGANIZATION ITEMS, NET
	The following is a summary of charges (credits) related to the Company's bankruptcy filing and reorganization (in millions).
		Predecessor
		Three Months Ended			Nine Months Ended
		September 30, 2014			September 30, 2014
	Professional fees	$	10.4		$	22.3
	Expense of deferred financing costs on convertible senior notes	—			1.2
	Effects of Plan:
	Gain on cancellation of convertible senior notes, net	(284.7		)	(284.7		)
	Gain on cancellation of convertible preferred stock, net	(64.1		)	(64.1		)
	Expense of unamortized restricted stock	0.4			0.4
	Gain related to the freeze of SERP benefits	(2.2		)	(2.2		)
	Fresh Start Adjustments:
	Revaluation of deferred revenue, net of deferred costs	(20.1		)	(20.1		)
	Revaluation of inventory	(35.4		)	(35.4		)
	Valuation of intangible assets	(260.7		)	(260.7		)
	Remeasurement of pension and postretirement benefit obligations	94.7			94.7
	Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations	121.7			121.7
	Reorganization items, net	$	(440.0	)	$	(426.9	)
	Refer to Note 3, "Fresh Start Accounting" for additional information regarding effects of the Plan and fresh start accounting adjustments.
	Cash payments for reorganization items totaled $6.6 million and $15.6 million for the three and nine months ended September 30, 2014, respectively.

Transition_Charges

Transition Charges	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Transition Charges	'
	TRANSITION CHARGES
	Non-Production Expenses Related to Ceasing Enrichment at the Paducah Plant
	The Company ceased uranium enrichment at the Paducah gaseous diffusion plant ("Paducah GDP") at the end of May 2013 and has subsequently completed repackaging and transferring its inventory to off-site licensed locations to meet future customer orders. On October 21, 2014, all of the leased portions of the Paducah GDP were de-leased and returned to DOE. Pursuant to a June 2014 agreement with DOE, the lease will terminate with respect to the Paducah GDP on August 1, 2015. The termination of the lease with respect to the Paducah GDP does not affect the Company’s right to lease portions of the DOE-owned site in Piketon, Ohio needed for the American Centrifuge program.
	The Paducah GDP operated for more than 60 years. Environmental liabilities associated with plant operations by agencies of the U.S. government prior to the Company's privatization on July 28, 1998 are the responsibility of the U.S. government. The USEC Privatization Act and the lease for the plant provide that DOE remains responsible for decontamination and decommissioning of the Paducah site.
	As the Company accelerated the expected productive life of plant assets and ceased uranium enrichment at the Paducah GDP, the Company has incurred a number of expenses unrelated to production that have been charged directly to cost of sales. Non-production expenses totaled $17.5 million and $66.7 million in the three and nine months ended September 30, 2014, and $47.7 million and $123.4 million in the three and nine months ended September 30, 2013, as follows:
	-	Site expenses, including lease turnover activities and Paducah and Portsmouth retiree benefit costs, of $15.6 million and $51.3 million in the three and nine months ended September 30, 2014, compared to $37.4 million and $63.8 million in the corresponding periods of 2013. Following the cessation of enrichment at the Paducah GDP, costs for plant activities that formerly were capitalized as production costs have been charged directly to cost of sales including inventory management and disposition, ongoing regulatory compliance, utility requirements for operations, security, and other site management activities related to transition of facilities and infrastructure;
	-	Inventory charges of $1.8 million and $13.5 million in the three and nine months ended September 30, 2014, compared to $5.0 million and $15.0 million in the three and nine months ended September 30, 2013. The Company incurred charges for residual uranium in cylinders transferred to DOE and inventories that had been deployed for cascade drawdown, assay blending and repackaging. The Company determined that it was uneconomic to recover resulting residual quantities for resale. In the prior year periods, charges included a uranium inventory valuation adjustment of $5.0 million to reflect declines in uranium market price indicators.
	-	Accelerated asset charges of $0.1 million and $1.9 million in the three and nine months ended September 30, 2014, compared to $5.3 million and $13.5 million in the corresponding periods of 2013. Beginning in the fourth quarter of 2012, the expected productive life of property, plant and equipment at the Paducah GDP was reduced from the lease term ending June 2016 to an accelerated basis ending December 2014. Beginning in the third quarter of 2012, costs that would have been previously treated as construction work in progress were treated similar to maintenance and repair costs because of the shorter expected productive life of the Paducah GDP. The expected productive life of the Paducah GDP was further reduced following the ceasing of enrichment at the end of May 2013, and the depreciation of property, plant and equipment at the Paducah site was completed as of June 30, 2014. Additionally, an immediate asset retirement charge of $19.3 million was incurred in the second quarter of 2013 for property, plant and equipment formerly used in the enrichment process at the Paducah GDP; and
	-	Power contract losses of $11.8 million in the nine months ended September 30, 2013. As a result of falling prices in power markets, the Company incurred expenses as it ceased enrichment at the Paducah GDP and canceled remaining power purchases.
	Special Charges Summary
	A summary of special charges recorded in the year ended December 31, 2013 and the nine months ended September 30, 2014, and changes in the related balance sheet accounts, follow (in millions):
		Predecessor																Successor
		Liability Balance to Be Paid,		2013 Special Charges			2013			Liability Balance to Be Paid,		Year-to-Date 2014 Special Charges			Year-to-Date 2014			Liability Balance to Be Paid,
		Dec. 31, 2012					Paid			Dec. 31, 2013					Paid			Sep. 30, 2014
	Workforce reductions, primarily severance payments	$	—	$	25.2		$	(4.0	)	$	21.2	$	4.5		$	(13.6	)	$	12.1
	Less: Amounts billed to DOE	—		(1.2		)	na			na		(2.4		)	na			na
	Pension and postretirement benefit charges, non-cash	—		22.2			na			na		—			na			na
	Advisory costs	0.1		11			(9.9		)	1.2		—			(1.2		)	—
		$	0.1	$	57.2		$	(13.9	)	$	22.4	$	2.1		$	(14.8	)	$	12.1
	na - not applicable
	Special Charges for Workforce Reductions
	Beginning in May 2013, the Company notified its Paducah employees of potential layoffs following the cessation of enrichment at the Paducah GDP. The notifications were provided under the Worker Adjustment and Retraining Notification Act ("WARN Act"), a federal statute that requires an employer to provide advance notice to its employees of potential layoffs in certain circumstances. The Company recorded a special charge in 2013 for termination benefits, consisting primarily of severance payments, of $25.2 million less $1.2 million of severance paid by the Company and invoiced to DOE.
	Special charges in the three and nine months ended September 30, 2014 consist of charges for termination benefits for workforce reductions in American Centrifuge development and headquarters operations, as well as severance accrual refinements for Paducah workforce reductions occurring in 2014. Special charges for termination benefits consist of $0.3 million in the three-month period and $4.5 million in the nine-month period, less amounts paid by the Company and invoiced to DOE for its portion of Paducah employee severance of $0.2 million in the three-month period and $2.4 million in the nine-month period. Accounts receivable as of September 30, 2014 include DOE's share of severance paid by the Company. DOE’s liability for its share of severance paid is pursuant to the USEC Privatization Act.
	Cumulative charges for termination benefits since ceasing enrichment total $29.7 million, less $3.6 million paid by the Company and invoiced to DOE. As of September 30, 2014, workforce reductions total 705 employees at the Paducah GDP, including 503 employees in 2014, and 28 employees at American Centrifuge and headquarters. Subsequently, nearly all of the remaining Paducah employees were terminated by early November 2014 after the leased portions of the site were turned over to DOE.
	The Company froze benefit accruals under its defined benefit pension plans, effective August 5, 2013, for active employees other than those who were covered by a collective bargaining agreement at the Paducah GDP. Pension benefits no longer increased for these employees to reflect changes in compensation or company service. However, these employees did not lose any benefits earned through August 4, 2013 under the pension plans and continued to accrue service credits toward vesting and qualifying for early or unreduced retirement benefits under the plans. Unamortized prior service costs related to those pension plan participants were accelerated. In addition, the Paducah workforce layoffs were expected to accelerate retirement obligations in the pension and postretirement benefit plans. Unamortized prior service costs related to affected plan participants were accelerated due to these terminations. Moreover, and in accordance with plan documents, certain affected plan participants were credited additional plan service credits based on their involuntary termination of employment. The net impact recorded in special charges for the year ended December 31, 2013 for these plans was $22.2 million.
	Charges for Advisory Costs
	Since late 2012, the Company had been engaged with advisors on the restructuring of its balance sheet. Special charges recorded for these advisors totaled $6.7 million in the nine months ended September 30, 2013 and $11.0 million for the year ended December 31, 2013.
	The Company has incurred advisory costs related to the Bankruptcy Filing in 2014 and these charges are included in Reorganization Items, Net, as detailed in Note 4.

Advanced_Technology_Costs_and_

Advanced Technology Costs and Other Income	9 Months Ended
	Sep. 30, 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 19, on May 1, 2014, the Company signed an agreement with UT-Battelle, LLC ("UT-Battelle"), the management and operating contractor for Oak Ridge National Laboratory ("ORNL"), for continued cascade operations and continuation of core American Centrifuge research and technology activities and the furnishing of related reports to ORNL (the "American Centrifuge Technology Demonstration and Operations Agreement", or "ACTDO Agreement"). 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 ORNL 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 $5.3 million and $12.3 million in the three and nine months ended September 30, 2014, respectively, for certain demobilization and maintenance costs related to American Centrifuge that are included in advanced technology costs.

Accounts_Receivable

Accounts Receivable	9 Months Ended
	Sep. 30, 2014
Accounts Receivable, Net, Current [Abstract]	'
Accounts Receivable	'
	RECEIVABLES
		Successor		Predecessor
	($ millions)	September 30,		31-Dec-13
		2014
	Utility customers and other	$	67.9	$	129.3
	DOE cost share of Cooperative Agreement funding	—		20.1
	Contract services, primarily DOE	22.1		13.6
	Accounts receivable	$	90	$	163
	In addition, certain overdue receivables from DOE are included in other long-term assets based on the extended timeframe expected to resolve claims for payment. Unpaid invoices to DOE totaled approximately $75 million at September 30, 2014 and approximately $81 million at December 31, 2013 related to filed claims. Due to the lack of a resolution with DOE and uncertainty regarding the timing and amount of future collections, Centrus has adjusted the overdue receivable balance for accounting purposes. The long-term receivable for fresh start accounting purposes is $19.8 million as of September 30, 2014.
	Centrus believes DOE has breached its agreements by failing to establish appropriate provisional billing and final indirect cost rates on a timely basis and the Company has filed claims with DOE for payment under the Contract Disputes Act ("CDA"). DOE denied the Company's initial claim for payment of $38.0 million for the periods through 2011, and on May 30, 2013, the Company appealed DOE's denial of its claims to the U.S. Court of Federal Claims. The Company has been able to reach a resolution on a portion of the amounts claimed and DOE has now paid approximately $6 million of claims for work performed in 2003 through 2005. The Court dismissed claims against DOE related to approximately $3.8 million due from prime subcontractors to DOE and the Company intends to pursue payment of such claims directly from the DOE subcontractors.
	On August 30, 2013, the Company submitted an additional claim to DOE under the CDA for payment of $42.8 million, representing DOE's share of pension and postretirement benefits costs related to the transition of Portsmouth site employees to DOE's decontamination and decommissioning ("D&D") contractor. On August 27, 2014, the DOE contracting officer denied the Company's claim. The Company intends to appeal the decision but there is no assurance it will be successful in its appeal. As noted in Note 19, Centrus has potential pension plan funding obligations under Section 4062(e) of the Employee Retirement Income Security Act ("ERISA") related to the Company's de-lease of the Portsmouth gaseous diffusion facilities and transition of employees to DOE's D&D contractor and related to the transition of employees in connection with the Paducah GDP transition. Centrus believes that DOE is responsible for a significant portion of any pension and postretirement benefit costs associated with the transition of employees at Portsmouth. The receivable for DOE's share of pension and postretirement benefits costs has a full valuation allowance due to the lack of a resolution with DOE and uncertainty regarding the amounts owed and the timing of collection. The amounts owed by DOE may be more than the amounts invoiced by the Company to date.
	Centrus has unapplied payments from DOE included in other long-term liabilities pending resolution of the long-term receivables from DOE described above. DOE funded a portion of the Company's contract services work through an arrangement whereby DOE transferred uranium to the Company which the Company immediately sold. The Company completed six competitive sales of uranium between the fourth quarter of 2009 and the first quarter of 2011. The net cash proceeds remaining from these uranium sales are to be applied, at the direction of DOE, (a) as revenue is recognized in the Company’s contract services segment as services are provided or (b) to existing receivables balances due from DOE in the Company’s contract services segment. The remaining payment balance included in other long-term liabilities is $19.6 million as of September 30, 2014 and $19.7 million as of December 31, 2013.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2014
Inventory, Net [Abstract]	'
Inventories	'
	INVENTORIES
	Centrus is a supplier of LEU for nuclear power plants. LEU consists of two components: separative work units (“SWU”) and uranium. SWU is a standard unit of measurement that represents the effort required to transform a given amount of natural uranium into two components: enriched uranium having a higher percentage of U235 and depleted uranium having a lower percentage of U235. The SWU contained in LEU is calculated using an industry standard formula based on the physics of enrichment. The amount of enrichment deemed to be contained in LEU under this formula is commonly referred to as its SWU component and the quantity of natural uranium deemed to be used in the production of LEU under this formula is referred to as its uranium component.
	Centrus holds uranium at licensed locations in the form of natural uranium and as the uranium component of LEU. Centrus holds SWU as the SWU component of LEU. Centrus may also hold title to the uranium and SWU components of LEU at fabricators to meet book transfer requests by customers. Fabricators process LEU into fuel for use in nuclear reactors. Costs included in inventory include purchase costs and previous production costs associated with the Paducah GDP. As of September 30, 2014, SWU inventory costs reflect fresh start accounting adjustments of $35.4 million as described in Note 3.
	Components of inventories follow (in millions):
		Successor						Predecessor
		September 30, 2014						December 31, 2013
		Current		Current		Inventories, Net		Current		Current		Inventories, Net
		Assets		Liabilities				Assets		Liabilities
				(a)						(a)
	Separative work units	$	412.6	$	91.5	$	321.1	$	628.4	$	200	$	428.4
	Uranium	86.3		81.6		4.7		335.4		299.7		35.7
	Materials and supplies	0.5		—		0.5		3.8		—		3.8
		$	499.4	$	173.1	$	326.3	$	967.6	$	499.7	$	467.9
	(a)	Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators.
	Uranium Provided by Customers and Suppliers
	Centrus held uranium with estimated values of approximately $698 million at September 30, 2014, and $1.3 billion at December 31, 2013, to which title was held by customers and suppliers and for which no assets or liabilities were recorded on the balance sheet. The reduction reflects a 46% decline in quantities. Utility customers provide uranium to Centrus as part of their enrichment contracts. Title to uranium provided by customers generally remains with the customer until delivery of LEU at which time title to LEU is transferred to the customer, and title to uranium is transferred to Centrus.

Property_Plant_and_Equipment_P

Property, Plant and Equipment Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment Disclosure	'
	PROPERTY, PLANT AND EQUIPMENT
	A summary of changes in property, plant and equipment follows (in millions):
		Predecessor												Successor
		December 31,			Capital Expenditures (Depreciation)			Retirements			Fresh Start Adjustments			September 30,
		2013												2014
	Leasehold improvements	$	141.1		$	—		$	(138.4	)	$	(2.7	)	$	—
	Machinery and equipment	164			—			(118.6		)	(41.7		)	3.7
		305.1			—			(257.0		)	(44.4		)	3.7
	Accumulated depreciation and amortization	(297.2		)	(4.0		)	256.8			44.4			—
		$	7.9		$	(4.0	)	$	(0.2	)	$	—		$	3.7
	In connection with the application of fresh start accounting, the gross property, plant and equipment value is adjusted to the net carrying value, and therefore accumulated depreciation and amortization is eliminated as of the Effective Date.
	During 2014, the Company entered into a commission sales agreement with a third-party auctioneer to assist in Paducah GDP asset disposals. Paducah related auctions held during the second and third quarters of 2014 as well as direct sales at Paducah and other sites of $8.9 million are included in other income less asset retirements and related sales expense. Cash proceeds totaled $8.4 million. Additional sales of assets and property are planned.

Intangible_Assets_Notes

Intangible Assets (Notes)	9 Months Ended
	Sep. 30, 2014
Intangible Assets Disclosure [Abstract]	'
Intangible Assets Disclosure [Text Block]	'
	INTANGIBLE ASSETS
	As described in Note 3, "Fresh Start Accounting", intangible assets represent the fair value adjustment to the assets and liabilities for the Company's LEU segment. The excess of the reorganization value over the fair value of identified tangible and intangible assets is reported separately on the Condensed Consolidated Balance Sheet.
				Successor
	($ millions)	Weighted Average Useful Life		September 30,
				2014
	Amortizable intangible assets:
	Backlog	(a)		$	54.6
	Customer relationships	15 years		68.9
	Total			$	123.5
	Nonamortizable intangible assets:
	Excess reorganizational value			$	137.2
	(a) The backlog intangible asset is amortized as delivery is made to the customer, reflecting the use of the asset.
	Amortization is computed using the straight-line method over the estimated useful life of the respective asset, except for the backlog intangible asset which is amortized as delivery is made to the customer. Amortization expense will be presented below gross profit on the Condensed Consolidated Statement of Operations. Amortization of the intangible assets commences in the fourth quarter of 2014 and there was no expense for the Predecessor Company for the three and nine months ended September 30, 2014 and September 30, 2013.
	The amount of amortization expense for intangible assets in each of the succeeding years is estimated to be as follows (in millions):
	2014	$	3.9
	2015	12.9
	2016	12.9
	2017	10.8
	2018	10.8
	Thereafter	72.2
		$	123.5

Accounts_Payable_and_Accrued_L

Accounts Payable and Accrued Liabilities (Notes)	9 Months Ended
	Sep. 30, 2014
Accounts Payable and Accrued Liabilities [Abstract]	'
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	'
	ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
		Successor		Predecessor
	($ millions)	September 30,		December 31,
		2014		2013
	Trade payables (a)	$	19.3	$	8.7
	Compensation and benefits (b)	27.6		27.3
	Severance	12.1		21.2
	Lease turnover costs	—		30.4
	Other accrued liabilities	20.5		26.9
		$	79.5	$	114.5
	(a) Includes success fees accrued at emergence at September 30, 2014. See Note 3.
	(b) Includes current portion of remeasurement of unfunded pension benefit liability at September 30, 2014. See Note 3.

Debt_Notes

Debt (Notes)	9 Months Ended
	Sep. 30, 2014
Debt Instrument [Line Items]	'
Debt Disclosure [Text Block]	'
	DEBT
	8.0% PIK Toggle Notes Due 2019/2024
	On the Effective Date and pursuant to the Plan, all of the Company’s Old Notes that were issued and outstanding immediately prior to the Effective Date were cancelled and the Company issued the New Notes pursuant to the Indenture. The New Notes were issued in an initial aggregate principal amount of $240.4 million. No cash was received related to the issuance. The principal amount may be increased by any payment of interest in the form of PIK payments, as elected by the Company.
	The New Notes will mature on September 30, 2019. However, the Company has the right to extend the maturity date to September 30, 2024 upon the satisfaction of certain funding conditions described in the Indenture relating to the funding, under binding agreements, of (i) the American Centrifuge project or (ii) the implementation and deployment of a National Security Train Program utilizing American Centrifuge technology. The New Notes will pay interest at a rate of 8.0% per annum. Interest will accrue from the most recent date to which interest has been paid, or if no interest has been paid, from the initial issue date. Interest will be payable semi-annually in arrears based on a 360-day year consisting of twelve 30-day months. The Company has elected to pay 3.0% per annum of interest due on the New Notes for the interest periods ending on March 31, 2015 and September 30, 2015 in the form of PIK payments. For any interest payment date from October 1, 2015 through the maturity of the New Notes, the Company has the option to pay up to 5.5% per annum of interest due on the New Notes in the form of PIK payments. The Company incurred offering expenses of $0.7 million related to the issuance of the New Notes. These costs are deferred and will be amortized on a straight-line basis, which approximates the effective interest method, over the life of the New Notes.
	The New Notes are guaranteed on a limited, subordinated and conditional basis by Enrichment Corp. Enrichment Corp. will be released from its guarantee without the consent of the holders of the New Notes upon the occurrence of certain termination events described in the Indenture (other than with respect to the payment of (i) any unpaid interest on the New Notes (including any unpaid interest on overdue principal and premium, if any, on the New Notes) and (ii) the principal and premium of any New Notes issued as a result of PIK payments made by the Company pursuant to the Indenture). The New Notes are not secured by a lien on any assets of the Company. Enrichment Corp.’s obligations under its guarantee are secured by a lien on Enrichment Corp.’s assets constituting collateral, including, among other things, its inventory and its accounts receivable, subject to certain exceptions.
	The New Notes rank equally in right of payment with all existing and future unsubordinated indebtedness of the Company (other than the Issuer Senior Debt as defined below) and are senior in right of payment to all existing and future subordinated indebtedness of the Company. The New Notes are subordinated in right of payment to certain indebtedness and obligations of the Company described in the Indenture (the "Issuer Senior Debt"), including (i) any indebtedness of the Company under a future credit facility, (ii) obligations of, and claims against, the Company under any equity investment (or any commitment to make an equity investment) with respect to the financing of the American Centrifuge project, (iii) obligations of, and claims against, the Company under any arrangement with DOE, export credit agencies or any other lenders or insurers with respect to the financing or government support of the American Centrifuge project and (iv) indebtedness of the Company to Enrichment Corp. under the Intercompany Note (as defined below).
	The Enrichment Corp. guarantee ranks equally in right of payment with all existing and future unsubordinated indebtedness of Enrichment Corp. (other than the Designated Senior Claims as defined below) and is senior in right of payment to all existing and future subordinated indebtedness of Enrichment Corp. The Enrichment Corp. guarantee is subordinated in right of payment to certain obligations of, and claims against, Enrichment Corp. described in the Indenture (collectively, the "Designated Senior Claims"), including obligations and claims:
	•	under a future credit facility;
	•	held by or for the benefit of the Pension Benefit Guaranty Corporation ("PBGC") pursuant to any settlement of any actual or alleged ERISA Section 4062(e) event;
	•	held by any party with respect to any equity investment (or any commitment to make an equity investment) with respect to the financing of the American Centrifuge project;
	•	held by DOE, export credit agencies or any other lenders or insurers with respect to the financing or government support of the American Centrifuge project; and
	•	held by the U.S. government.
	The New Notes are redeemable by the Company in whole or in part, at any time, at a price equal to 100% of the principal amount (including as a result of any PIK payments) of the New Notes to be redeemed plus accrued and unpaid interest, if any, to the date of redemption. The New Notes are not subject to mandatory redemption. There is no sinking fund provided for the New Notes. Upon the occurrence of a Change of Control, as defined in the Indenture, the Company will be required to offer to repurchase all of the New Notes at 101% of the aggregate principal amount repurchased plus accrued and unpaid interest, if any.
	The Indenture contains covenants customary for securities such as the New Notes covering (i) the payment of principal and interest, (ii) maintenance of an office or agency for the payment of the notes, (iii) SEC reports, (iv) stay, extension and usury laws, (v) payment of taxes, (vi) existence, (vii) maintenance of properties and (viii) maintenance of insurance. The Indenture otherwise contains no covenants that restrict the operation of the Company or its subsidiaries, or their respective businesses other than (i) limitations on Enrichment Corp.’s ability to transfer the collateral and (ii) limitations on liens that may be imposed on the assets of Enrichment Corp., which covenants are, in each case, subject to certain exceptions set forth in the Indenture.
	Intercompany Financing
	On the Effective Date, Centrus Energy Corp. obtained a new secured intercompany financing of $48.0 million from Enrichment Corp. (the "Intercompany Note") to provide funds necessary to make payments of $35.3 million required under the Plan, as well as $12.7 million available for working capital and other general corporate purposes. Payments required under the Plan included the repayment of borrowings under the debtor-in-possession credit facility from Enrichment Corp. (the “DIP Facility”) of $16.3 million, interest payments of $15.9 million to holders of the Old Notes, and $3.1 million in professional fees and other expenses. The Intercompany Note accrues interest at an annual rate of 10.5%, is payable on demand and is secured by substantially all of the Company’s assets.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENTS
	Pursuant to the accounting guidance for fair value measurements, fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, consideration is given to the principal or most advantageous market and assumptions that market participants would use when pricing the asset or liability.
	Fair Value Hierarchy
	The accounting guidance for fair value measurement also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:
	•	Level 1 – quoted prices in active markets for identical assets or liabilities.
	•	Level 2 – inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or model-derived valuations in which significant inputs are observable or can be derived principally from, or corroborated by, observable market data.
	•	Level 3 – unobservable inputs in which little or no market data exists.
	Financial Instruments Recorded at Fair Value
		Fair Value Measurements
		(in millions)
		Successor											Predecessor
		September 30, 2014											December 31, 2013
		Level 1		Level 2			Level 3		Total				Level 1	Level 2		Level 3	Total
	Assets:
	Cash equivalents (a)	—		$	90.6		—		$	90.6			—	$	312.7	—	$	312.7
	Deferred compensation asset (b)	—		3.1			—		3.1				—	3.1		—	3.1
	Liabilities:
	Deferred compensation obligation (b)	—		2.9			—		2.9				—	3		—	3
	(a)	Cash equivalents consist of funds invested in institutional money market funds. These investments are classified within Level 2 of the valuation hierarchy because the publicly reported Net Asset Value (“NAV”) of one dollar does not necessarily reflect the fair value of the underlying securities.
	(b)	The deferred compensation obligation represents the balance of deferred compensation plus net investment earnings. The deferred compensation plan is informally funded through a rabbi trust using variable universal life insurance. The cash surrender value of the life insurance policies is designed to track the deemed investments of the plan participants. Investment crediting options consist of institutional and retail investment funds. The deemed investments are classified within Level 2 of the valuation hierarchy because (i) of the indirect method of investing and (ii) unit prices of institutional funds are not quoted in active markets.
	Other Financial Instruments
	As of September 30, 2014 and December 31, 2013, the balance sheet carrying amounts for accounts receivable, accounts payable and accrued liabilities (excluding the deferred compensation obligation described above), and payables under the commercial agreement (the "Russian Contract") with a Russian government entity known as Techsnabexport ("TENEX") approximate fair value because of the short-term nature of the instruments.
	The balance sheet carrying amounts and estimated fair values of the Company’s New Notes and former Old Notes follow (in millions):
		Successor						Predecessor
		September 30, 2014						December 31, 2013
		Carrying Value			Fair Value			Carrying Value			Fair Value
	8% PIK toggle notes	$	240.4		$	240.4		-			-
	Convertible senior notes, excluding accrued interest	-			-			$	530		$	184.1
	As of September 30, 2014, Centrus estimates that the fair value of the 8% PIK toggle notes is equal to the face value resulting from the new capital structure under the Plan as negotiated with the creditors, as there are no observable publicly traded debt markets with similar terms and average maturities. Accordingly, the Company’s long-term debt is classified within Level 3 of the fair value hierarchy at emergence. No cash was received related to the issuance on September 30, 2014. The terms of the notes were negotiated based on arm's length negotiations with access to all relevant information necessary to provide knowledgeable, willing and unpressured participants to the transaction to reach a negotiated, consensual agreement on the terms of this new debt instrument. Given the access to information, management concludes that the face value of the new notes is a fair approximation of the fair value of such notes at emergence.
	As of December 31, 2013, the estimated fair value of the convertible senior notes was based on the trading price as of the balance sheet date, and is classified as using Level 1 inputs in the fair value measurement.
	Fresh Start Accounting
	Upon the Company’s emergence from bankruptcy, Centrus applied the provisions of fresh start accounting to its financial statements, including the allocation of the reorganization value to its individual assets based on their estimated fair values. Details are provided in Note 3, "Fresh Start Accounting".

Pension_and_Postretirement_Hea

Pension and Postretirement Health and Life Benefits	9 Months Ended
	Sep. 30, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]	'
Pension and Postretirement Health and Life Benefits	'
	PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS
	The components of net benefit costs for pension and postretirement health and life benefit plans were as follows (in millions):
		Predecessor
		Defined Benefit Pension Plans												Postretirement Health and Life Benefit Plans
		Three Months Ended						Nine Months Ended						Three Months Ended						Nine Months Ended
		September 30,						September 30,						September 30,						September 30,
		2014			2013			2014			2013			2014			2013			2014			2013
	Service costs	$	0.6		$	1.4		$	1.8		$	8.8		$	0.4		$	0.9		$	1.3		$	2.7
	Interest costs	10.6			11.5			31.7			33.5			2.5			2.2			7.5			6.7
	Expected returns on plan assets (gains)	(12.9		)	(12.8		)	(38.5		)	(38.3		)	(0.5		)	(0.5		)	(1.5		)	(1.7		)
	Amortization of actuarial (gains) losses, net	0.4			2			1			14.2			—			0.6			—			2
	Amortization of prior service costs (credits)	—			—			—			0.7			(0.1		)	—			(0.3		)	—
	Curtailment (gains)	(2.2		)	—			(2.2		)	(0.7		)	—			—			—			—
	Net benefit costs (credits)	$	(3.5	)	$	2.1		$	(6.2	)	$	18.2		$	2.3		$	3.2		$	7		$	9.7
	Centrus expects to contribute $20.4 million to the defined benefit pension plans in 2014, including $20.1 million of contributions under ERISA and $0.3 million to non-qualified plans. The Company has contributed $20.3 million in the nine months ended September 30, 2014.
	There is no required contribution for the postretirement health and life benefit plans under ERISA and Centrus does not expect to contribute in 2014. Centrus receives federal subsidy payments for sponsoring prescription drug benefits that are at least actuarially equivalent to Medicare Part D.
	Historically, net periodic benefit costs related to continued operations are allocated to cost of sales, selling, general and administrative expense, and advanced technology costs.
	The defined benefit pension plans were amended during 2013 to allow a lump sum payment option to active employees who are not covered by a collective bargaining agreement at the Paducah GDP and who are terminated as a result of participation in a reduction in force from August 5, 2013 through December 31, 2014. Any lump sum distributions in connection with this program would fully settle Centrus' long-term pension obligations related to those benefits. Total lump sum benefits paid in the nine months ended September 30, 2014 were $24.7 million. Settlement accounting, which requires immediate recognition of a portion of amounts deferred in accumulated other comprehensive income, need not be followed if the sum of the settlements for the year is less than the service cost and interest cost components of the net periodic benefit cost for the plan year, determined on a plan by plan basis. Total lump sum payments in the nine months ended September 30, 2014 fell below the minimum settlement accounting thresholds for the plans and therefore settlement accounting was not required.
	In connection with Centrus' emergence from Chapter 11 bankruptcy, plan assets and benefit obligations were remeasured as of September 30, 2014. The net effect of the remeasurement was an increase of $85.5 million on the net pension liability (unfunded status) and an increase of $9.2 million in the postretirement health and life benefit plans liability. The increase in the pension and postretirement health and life benefit plans obligations are primarily a result of lower discount rates and revised mortality assumptions reflecting the Society of Actuaries’ RP-2014 and MP-2014 exposure draft mortality tables and mortality improvement scale. Discount rates for the pension plans as of September 30, 2014 are 4.44% for the Employees' Retirement Plan of Centrus Energy Corp., 4.33% for the Retirement Program Plan for Employees of United States Enrichment Corporation and 4.41% for the nonqualified supplemental executive pension plans. The discount rate for the United States Enrichment Corporation Health and Welfare Plan as of September 30, 2014 was 4.03%. Discount rates as of December 31, 2013 were 4.87% for all of the retirement and pension plans and 4.45% for the health and welfare plan.
	The Company provides executive officers additional retirement benefits pursuant to the SERPs in excess of qualified plan limits imposed by tax law based on a targeted benefit objective. Centrus froze benefit accruals under the SERPs effective September 30, 2014. Curtailment accounting was reflected related to the freeze of SERP benefits for affected plan participants, resulting in a net credit to special charges of $2.2 million in the three months ended September 30, 2014.
	Historically, the Company recognized the actuarial gains and losses as a component of stockholders’ equity on an annual basis and generally amortized them into operating results over the average future service period of the active employees of these plans (or the average future lifetime of plan participants for inactive plans), to the extent the unrecognized gain or loss is outside a corridor. As a result of fresh start accounting, the amount of Predecessor accumulated other comprehensive loss, net of tax of $121.7 million has been expensed as part of Reorganization Items, Net. The Successor Company has modified its accounting policy to immediately recognize these gains and losses on a prospective basis in the statement of operations in the period in which they arise.
	Refer to Note 3, "Fresh Start Accounting", for additional information regarding effects of the Plan and fresh start accounting adjustments.

Stockholders_Equity_Notes

Stockholders' Equity (Notes)	9 Months Ended
	Sep. 30, 2014
Stockholders' Equity Attributable to Parent [Abstract]	'
Stockholders' Equity Note Disclosure [Text Block]	'
	STOCKHOLDERS' EQUITY
	On September 30, 2014 and pursuant to the Plan, all interests in the Old Common Stock or other rights and the Old Preferred Stock, and any options or other rights exercisable therefor, as applicable, were cancelled, extinguished and deemed of no further force and effect. Further, the Warrants to purchase shares of Old Common Stock or Old Preferred Stock issued to Toshiba and B&W were cancelled. The Company provided written notice to the New York Stock Exchange (the "NYSE") that, pursuant to the Plan, all outstanding shares of Old Common Stock were cancelled. Accordingly, the Company requested that the NYSE suspend trading of and delist the Old Common Stock.
	The Company's certificate of incorporation was amended and restated to authorize 20,000,000 shares of New Preferred Stock, 70,000,000 shares of Class A Common Stock and 30,000,000 shares of Class B Common Stock.
	On September 30, 2014 and pursuant to the Plan, the Company issued 9,000,000 shares of New Common Stock, which included the issuance of 7,563,600 shares of Class A Common Stock and 1,436,400 shares of Class B Common Stock. The issuance of the Class A Common Stock and Class B Common Stock under the Plan was not registered with the SEC. The Class A Common Stock and Class B Common Stock were issued in reliance on exemptions under the Securities Act provided by Section 1145 of the Bankruptcy Code. The Class B Common Stock was issued to B&W and Toshiba and has the same rights, powers, preferences and restrictions and ranks equally in all matters with the Class A Common Stock issued to former holders of the Old Notes, except voting. Holders of Class B Common Stock are entitled to elect, in the aggregate, two members of the Board of Directors of the Company, subject to certain holding requirements.
	Additionally, the Company reserved 1,000,000 shares of Class A Common Stock under a new management incentive plan. Refer to Note 16 "Stock-Based Compensation".
	The Company’s Class A Common Stock has been approved for listing on the NYSE under the symbol "LEU". The Class A Common Stock began trading on the NYSE on September 30, 2014. Continued listing of the Class A Common Stock requires compliance with the NYSE’s continued listing requirements which include, among other things, requirements to maintain a minimum market capitalization and minimum share price. Refer to Note 19, "Commitments and Contingencies - NYSE Listing Standards Notices".
	The issuance of the Class A Common Stock and Class B Common Stock under the Plan was not registered with the SEC. The Class A Common Stock and Class B Common Stock were issued in reliance on exemptions under the Securities Act provided by Section 1145 of the Bankruptcy Code.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2014
Share-based Compensation [Abstract]	'
Stock-Based Compensation	'
	STOCK-BASED COMPENSATION
		Predecessor
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(millions)
	Total stock-based compensation costs:
	Restricted stock and restricted stock units	$	0.1	$	0.3	$	0.6	$	1.6
	Stock options, performance awards and other	—		—		—		0.1
	Expense included in selling, general and administrative and advanced technology costs	$	0.1	$	0.3	$	0.6	$	1.7
	Total recognized tax benefit	$	—	$	—	$	—	$	—
	The total recognized tax benefit is reported at the federal statutory rate net of the tax valuation allowance.
	Stock-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized over the requisite service period, which is either immediate recognition if the employee is eligible to retire, or on a straight-line basis until the earlier of either the date of retirement eligibility or the end of the vesting period. There was no stock-based compensation granted in the three and nine months ended September 30, 2014. As of September 30, 2014, all compensation cost had been recognized related to restricted shares and restricted stock units granted in prior years.
	2014 Equity Incentive Plan
	On the Effective Date, the Company adopted the 2014 Equity Incentive Plan which authorizes the issuance of up to 1,000,000 shares of Class A Common Stock to the Company’s employees, officers, directors and other individuals providing services to the Company or its affiliates pursuant to options, stock appreciation rights, restricted stock units, restricted stock, performance awards, dividend equivalent rights and other stock based awards, as well as cash based awards. There were no options or other stock-based awards issued as of September 30, 2014 under this plan.

Income_Taxes_Notes

Income Taxes (Notes)	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	INCOME TAXES
	The income tax provision from continuing operations was $0.1 million for the three months ended September 30, 2014 and the income tax benefit was $1.0 million for the nine months ended September 30, 2014. The income tax benefit from continuing operations was $18.5 million and $57.8 million for the three and nine months ended September 30, 2013, respectively. Included in the income tax benefit was a discrete item for reversals of previously accrued amounts associated with liabilities for unrecognized benefits of $1.0 million for the nine months ended September 30, 2014 and $0.7 million for the corresponding period in 2013. In 2013 there was an income tax benefit from continuing operations because there was income in other components of the financial statements. In 2014, after adjustment for nontaxable reorganization items, there are pretax losses from continuing operations and no other components of the financial statements. Therefore, except for discrete items, there is no income tax benefit from continuing operations.
	Intraperiod tax allocation rules require that all items, including other comprehensive income and discontinued operations, be considered for purposes of determining the amount of tax benefit that results from a loss in continuing operations.  When there is a full valuation allowance against deferred tax assets and there are pretax losses from continuing operations and income in other components of the financial statements (e.g., discontinued operations and other comprehensive income), the income tax benefit from pretax losses from continuing operations is limited to the amount of income tax expense recorded on all items other than continuing operations. The income tax benefit from continuing operations consists of the income tax benefit calculated using an estimated annual effective tax rate as well as discrete items. The estimated annual effective tax rate applied to pretax losses from continuing operations for the interim period is calculated using the estimated full-year plan for ordinary income and the year-to-date amounts for discontinued operations and other comprehensive income. The income tax expense on all items other than continuing operations is recorded based on year-to-date amounts.
	A full valuation allowance against net deferred taxes was first recorded in 2011 due to cumulative losses incurred in recent years and due to substantial uncertainty to generate future taxable income that would lead to realization of the net deferred tax assets. The valuation allowance results in the Company’s inability to record tax benefits on future losses until it generates sufficient taxable income to support the elimination of the valuation allowance. However, the valuation allowance will not affect the Company’s ability to use its deferred tax assets if it generates taxable income in the future.
	Deferred taxes are reported on the balance sheet as current or noncurrent based on the balance sheet classification of the related assets and liabilities to which the deferred taxes are attributable. Therefore, the deferred taxes related to the intangibles are classified as noncurrent deferred tax liabilities because the intangibles are classified as noncurrent on the balance sheet whereas the deferred taxes related to the deferred revenue are classified as a deferred tax current liability because deferred revenue is classified as a current liability. Because there is a full valuation allowance against net deferred taxes, it is anticipated that there will be no net impact to the tax provision as these deferred tax liabilities reverse over time either through amortization or recognition of the deferred revenue for tax purposes. After allocation of the valuation allowance between current and noncurrent deferred tax assets and netting deferred tax assets and liabilities, the company has a net current deferred tax liability of $26.4 million and a net noncurrent deferred tax asset of $26.4 million as of September 30, 2014.
	As a result of the adoption of fresh start accounting upon emergence from bankruptcy as discussed in Note 3, the Company recorded adjustments to its deferred taxes to reflect the increase in book basis of certain intangible assets that have no basis for tax purposes and to reflect the elimination of almost all deferred revenue for book accounting purposes that continues to be deferred for tax purposes.
	Upon the Company’s emergence on September 30, 2014 from Chapter 11 bankruptcy, the amount of the Company’s aggregate indebtedness was reduced. The reduction in the Company’s indebtedness will result in cancellation of debt (“COD”) income for tax purposes of approximately $340 million for the calendar year ending 2014. Because realization of such income will occur under the Bankruptcy Code, the Company will reduce federal and state net operating losses (“NOL”), tax credits, and the tax basis in property that would otherwise be available to offset taxable income starting in 2015.
	On an ongoing basis, the Company monitors activity in its 5% shareholder base for substantial changes in ownership as defined under Internal Revenue Code Section 382 (“Section 382”). The Company experienced an ownership change for tax purposes (i.e., a more than 50% change in stock ownership change on the September 30, 2014 Effective Date). As a result, the use of any of the Company’s federal and state NOL carryforwards and tax credits generated prior to the ownership change (that are not reduced by the amount of the COD income) will be subject to an annual limitation of approximately $3 million. As of September 30, 2014, the federal NOLs not reduced by COD income, but subject to the annual limitation, are approximately $170 million. The federal NOLs can be carried forward for 20 years; therefore, based on the annual limitation, the maximum amount of NOLs that can be utilized in the future is approximately $60 million, subject further to the net unrealized built-in loss rules as described below. All credits of the Company are expected to be reduced by COD income. The Company continues to monitor its ownership shifts.
	Section 382(l)(5) provides for an exception to the annual limitations of Section 382 for certain corporations that emerge from bankruptcy. The Company is evaluating whether or not the exception has been met. In addition, certain future requirements must be met to receive the benefits as well. The Company has the ability to elect out of the benefits of Section 382(l)(5) and apply the annual limitation. That election must be made with the filing of the Company’s calendar year 2014 federal income tax return, which is due no later than September 15, 2015. The Company will continue to monitor its tax position as well as evaluate its ability to qualify for and its desire to elect the benefits of Section 382(l)(5).
	The Company is required to determine whether it had a net unrealized built-in gain (“NUBIG”) or net unrealized built-in loss (“NUBIL”) at the September 30, 2014 Effective Date. The Company believes that there was a NUBIL at the Effective Date. As a result, certain depreciation and loss deductions recognized during the five-year period beginning on the Effective Date would be subject to the same Section 382 annual limitation (as described above) if the Company does not qualify for the benefits under Section 382(l)(5) or if the Company qualifies, but elects out of that exception.
	The Company files income tax returns with the U.S. government and various states and foreign jurisdictions. In the second quarter of 2014, the Internal Revenue Service ("IRS") completed the Company’s federal income tax return examination for tax years 2008 through 2011 and made no adjustments or changes to the reported tax.

Net_Income_Per_Share

Net Income Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net Income (Loss) Per Share	'
	NET INCOME (LOSS) PER SHARE
	Basic net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period, excluding any unvested restricted stock. In calculating diluted net income per share, the numerator is increased by interest expense on the convertible notes and convertible preferred stock dividends, net of tax, and the denominator is increased by the weighted average number of shares resulting from potentially dilutive securities, assuming full conversion, consisting of stock compensation awards, convertible notes, convertible preferred stock and warrants. No dilutive effect is recognized in a period in which a net loss has occurred or in which the assumed conversion effect of convertible securities is antidilutive.
	All outstanding shares of Old Common Stock were cancelled as of the Effective Date. As there is no consolidated statements of operations for the Successor Company for the periods ended September 30, 2014, basic and diluted net income (loss) per share computations for the three and nine months ended September 30, 2014 are based on the weighted-average number of shares of Old Common Stock (as adjusted for dilutive effects of potential common shares) outstanding during the period prior to the cancellation of the Old Common Stock on September 30, 2014.
		Predecessor
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014				2013
		(millions)
	Numerators:
	Income (loss) from continuing operations	$	418.9		$	(44.3	)	$	340.1			$	(108.9	)
	Income from discontinued operations	—			—			—				21.7
	Net income (loss)	$	418.9		$	(44.3	)	$	340.1			$	(87.2	)
	Interest expense on convertible notes (a)	3			—			9				—
	Net income if-converted - diluted	$	421.9		$	(44.3	)	$	349.1			$	(87.2	)
	Denominator:
	Weighted average common shares	5			5			5				5
	Less: Weighted average unvested restricted stock	0.1			0.1			0.1				0.1
	Denominator for basic calculation	4.9			4.9			4.9				4.9
	Weighted average effect of dilutive securities:
	Convertible notes	1.8			1.8			1.8				1.8
	Convertible preferred stock:
	Equivalent common shares (b)	35.8			13.7			27.2				10.5
	Less: share issuance limitation (c)	34.9			12.8			26.3				9.6
	Net allowable common shares	0.9			0.9			0.9				0.9
	Subtotal	2.7			2.7			2.7				2.7
	Less: shares excluded in a period of a net loss or antidilution	—			2.7			—				2.7
	Weighted average effect of dilutive securities	2.7			—			2.7				—
	Denominator for diluted calculation	7.6			4.9			7.6				4.9
	Income (loss) per share from continuing operations – basic	$	85.49		$	(9.04	)	$	69.41			$	(22.22	)
	Income (loss) per share from continuing operations – diluted	$	55.51		$	(9.04	)	$	45.93			$	(22.22	)
	Income per share from discontinued operations – basic and diluted	$	—		$	—		$	—			$	4.43
	Net income (loss) per share – basic	$	85.49		$	(9.04	)	$	69.41			$	(17.79	)
	Net income (loss) per share – diluted	$	55.51		$	(9.04	)	$	45.93			$	(17.79	)
	(a)	Interest expense on Old Notes and Old Preferred Stock dividends was $5.1 million in the three months ended September 30, 2013 and $15.2 million in the nine months ended September 30, 2013. The tax rate is the statutory rate.
	No dilutive effect is recognized in a period in which a net loss has occurred. In addition, for purposes of calculating income from discontinued operations per share, the calculation of (loss) from continuing operations per share provides a control number in determining whether potential common shares are dilutive or antidilutive. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss (discontinued operations and net income/loss), regardless of their antidilutive effect on such categories. Therefore, no dilutive effect is recognized in the calculation of income from discontinued operations per share.
	(b)	The number of equivalent shares of Old Common Stock for the Old Preferred Stock was based on the arithmetic average of the daily volume weighted average prices per share of Old Common Stock for each of the last 20 trading days, and was determined as of the beginning of the period for purposes of calculating diluted net income per share.
	(c)	Prior to obtaining shareholder approval, the Company's Old Preferred Stock could not have been converted into an aggregate number of shares of Old Common Stock in excess of 19.99% of the shares of Old Common Stock outstanding on May 25, 2010 (approximately 0.9 million shares adjusted to take into account the 1-for-25 reverse stock split), in compliance with the rules of the NYSE. If a share issuance limitation were to exist at the time of share conversion or sale, any shares of Old Preferred Stock subject to the share issuance limitation would have been subject to optional or mandatory redemption for, at the Company's option, cash or SWU consideration. However, the Company’s ability to redeem may have been limited by Delaware law and the Bankruptcy Code.
	Options and warrants to purchase shares of Old Common Stock having an exercise price greater than the average share market price are excluded from the calculation of diluted net income per share:
		Predecessor
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2014				2013				2014					2013
	Options excluded from diluted net income per share	200				1,000				200					1,000
	Warrants excluded from diluted net income per share	250,000				250,000				250,000					250,000
	Exercise price of excluded options	$	283.25	to		$	177.5	to		$	283.25		to		$	177.5	to
		$	357			$	357			$	357				$	357
	Exercise price of excluded warrants	$	187.5			$	187.5			$	187.5				$	187.5
	Net income (loss) per share information reported for the three and nine months ended September 30, 2014 is not comparative to the share information reported for the corresponding periods of 2013 as a result of the emergence from Chapter 11 bankruptcy and the application of fresh start accounting.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	American Centrifuge
	Project Funding
	The economics for commercial deployment of the American Centrifuge technology are severely challenged by the current supply/demand imbalance in the market for LEU and related downward pressure on market prices for SWU that are now at their lowest levels in more than a decade. At current market prices, Centrus does not believe that its previous plans for commercialization of the American Centrifuge project are economically viable. Although the economics of the American Centrifuge project are severely challenged under current enrichment market conditions, market conditions are expected to improve and Centrus continues to take steps to maintain its options to commercially deploy the American Centrifuge technology as a long-term, direct source of domestic enrichment production to support the long-term viability of the Company's LEU business.
	From June 2012 through April 2014, the Company performed work under the Cooperative Agreement, as amended, for the research, development and demonstration of the American Centrifuge technology. The Company achieved or exceeded all of the program technical milestones and performance indicators on or ahead of schedule and on or under budget, and the Cooperative Agreement expired by its terms on April 30, 2014.
	In light of the status of the American Centrifuge project, DOE instructed UT-Battelle, the management and operating contractor for ORNL, to assist in developing a path forward for achieving a reliable and economic domestic uranium enrichment capability that promotes private sector deployment and that supports national security purposes. This task includes, among other goals: (1) taking actions intended to promote the continued operability of the advanced enrichment centrifuge machines and related property, equipment and technology currently utilized in the American Centrifuge project; and (2) assessing technical options for meeting DOE’s national security needs and preserving the option of commercial deployment. Pursuant to those instructions, ORNL chose to subcontract with the Company. On May 1, 2014, the Company signed the ACTDO Agreement with UT-Battelle for continued research, development and demonstration of the American Centrifuge technology in furtherance of DOE’s national security objectives.
	The ACTDO Agreement is a firm fixed-price contract that provides for continued cascade operations at the Company's Piketon, Ohio facility, testing at the K-1600 test facility in Oak Ridge, Tennessee, 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 prior Cooperative Agreement with DOE. The reduced scope of work does not include activities related to engineering, procurement and construction of the commercial plant; work related to the manufacturing of new centrifuge machines; or design, testing, and procurement of specialty uranium handling equipment necessary to support the uranium enrichment process. In order to align its continued activities with the funding provided under the ACTDO Agreement, the Company commenced a limited demobilization of those activities not included in the ACTDO Agreement scope of work and began to sell or otherwise dispose of certain assets no longer required to conduct current activities including the sale of assets through an auction process.
	On July 31, 2014, ORNL exercised its option to extend the period of performance for the ACTDO Agreement by an additional six months to March 31, 2015, which increased the amount of the contract from approximately $33.7 million to approximately $75.3 million. The agreement is incrementally funded and provides for payments of approximately $6.7 million per month through September 30, 2014 and approximately $6.9 million per month thereafter. ORNL has provided funding under the ACTDO Agreement on a monthly basis, and funds currently allotted to the agreement cover the work to be performed through November 30, 2014. The agreement also provides ORNL with one additional option to extend the agreement by six months to September 30, 2015. The option is priced at approximately $41.7 million. ORNL may exercise its option by providing notice 60 days prior to the end of the term of the agreement. The total amount of the contract including options is approximately $117 million.
	To better manage the transition to the ACTDO Agreement with ORNL, the Company provided notice effective April 25, 2014 pursuant to the Limited Liability Company Agreement of American Centrifuge Manufacturing, LLC (“ACM”), as amended, for the automatic transfer of the ownership interests of Babcock & Wilcox Technical Services Group, Inc. (“B&W TSG”) to American Centrifuge Holdings, LLC (“ACH”) at no cost. As a result, ACM is 100% indirectly owned by the Company. On June 27, 2014, the Company, together with its direct and indirect subsidiaries ACM and ACH, signed an agreement with The Babcock & Wilcox Company and B&W TSG to resolve issues related to the expiration and termination of certain agreements in connection with (i) the limited demobilization of certain American Centrifuge project activities as a result of the reduction of the scope of work on the American Centrifuge project under the ACTDO Agreement; and (ii) the automatic, no-cost transfer of B&W TSG’s ownership interest in ACM to ACH.
	Milestones under the 2002 DOE-USEC Agreement
	The Company and DOE are parties to an agreement dated June 17, 2002, as amended (the “2002 DOE-USEC Agreement”), pursuant to which the Company and DOE made long-term commitments directed at resolving issues related to the stability and security of the domestic uranium enrichment industry. Pursuant to the Plan and with the consent of DOE, Centrus assumed the 2002 DOE-USEC Agreement subject to the parties reserving all rights under the agreement. The agreement provides that Centrus will 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.
	The 2002 DOE-USEC Agreement provides DOE with specific remedies if Centrus fails to meet a milestone that would materially impact Centrus' ability to begin commercial operations of the American Centrifuge Plant on schedule and such delay was within Centrus' control or was due to Centrus' fault or negligence. These remedies could include terminating the 2002 DOE-USEC Agreement, revoking Centrus' access to DOE's U.S. centrifuge technology that Centrus requires for the success of the American Centrifuge project and requiring Centrus to transfer certain of its rights in the American Centrifuge technology and facilities to DOE, and to reimburse DOE for certain costs associated with the American Centrifuge project. Any of these remedies under the 2002 DOE-USEC Agreement could have a material adverse impact on Centrus' business.
	The 2002 DOE-USEC Agreement provides that if a delaying event beyond the control and without the fault or negligence of Centrus occurs which would affect Centrus' ability to meet an American Centrifuge project 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 has notified DOE that it has not met the June 2014 milestone “Commitment to proceed with commercial operation” within the time period currently provided due to events beyond its control and without the fault or negligence of the Company. The assumption of the 2002 DOE-USEC Agreement pursuant to the Plan did not impact 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.
	Decontamination and Decommissioning
	Centrus leases facilities in Piketon, Ohio from DOE for the ACP. At the conclusion of the lease, Centrus is obligated to return these leased facilities to DOE in a condition that meets U.S. Nuclear Regulatory Commission ("NRC") requirements and in the same condition as the facilities were in when they were leased to Centrus (other than due to normal wear and tear). Centrus must remove all Company-owned capital improvements at the ACP, unless otherwise consented to by DOE, by the conclusion of the lease term. The liability for ACP D&D, included in other long-term liabilities, was $22.6 million as of September 30, 2014 and December 31, 2013 based on cost projections.
	Centrus is required to provide financial assurance to the NRC and DOE for D&D costs under a regulatory-prescribed methodology that includes potential contingent costs and reserves. As of September 30, 2014 and December 31, 2013, Centrus has provided financial assurance to the NRC and DOE in the form of surety bonds totaling $29.4 million, which is fully cash collateralized by Centrus.
	If construction of the ACP is resumed, the liability for ACP D&D and financial assurance requirements will increase commensurate with facility construction and operations.
	NYSE Listing Standards Notices
	On May 8, 2012, the Company received notice from the NYSE that the average closing price of its common stock was below the NYSE's continued listing criteria relating to minimum share price. The NYSE listing requirements require that a company's common stock trade at a minimum average closing price of $1.00 over a consecutive 30 trading-day period.  On July 1, 2013, the Company effectuated a reverse stock split in order to regain compliance with the NYSE continued listing criteria related to minimum share price. This action resulted in the Company's closing share price exceeding $1.00 per share and remaining above that level, and the condition has now been cured.
	On April 30, 2013, the Company received notice from the NYSE that the decline in the Company's total market capitalization has caused it to be out of compliance with another of the NYSE's continued listing standards. The NYSE listing requirements require that a company maintain an average market capitalization of not less than $50 million over a consecutive 30 trading-day period where the company's total stockholders' equity is less than $50 million. In accordance with the NYSE's rules, the Company submitted a plan advising the NYSE of definitive action that would bring it into conformity with the market capitalization listing standards within 18 months of receipt of the letter. On August 1, 2013, the NYSE accepted the Company's plan of compliance and the Company's common stock continued to be listed on the NYSE during an 18-month cure period ended October 30, 2014. On October 31, 2014, the NYSE notified the Company that it had regained compliance with the NYSE continued listing standards by achieving an average 30 trading-day market capitalization above $50 million. In accordance with the NYSE rules, the Company will be subject to a 12-month follow-up period to ensure that the Company does not fall below any of the NYSE continuing listing standards.
	Potential ERISA Section 4062(e) Liability
	The Company has been in discussions with the PBGC regarding the impact of the Company's de-lease of the Portsmouth gaseous diffusion facilities and related transition of employees performing government services work to DOE's D&D contractor on September 30, 2011.  Centrus has also been in discussions with the PBGC regarding the cessation of enrichment at the Paducah GDP and related transition of employees including reductions in force. The PBGC has informally advised Centrus of its preliminary view that the Portsmouth site transition is a cessation of operations that triggers liability under ERISA Section 4062(e) and that its preliminary estimate is that the ERISA Section 4062(e) liability (computed taking into account the plan's underfunding on a termination basis, which amount differs from that computed for GAAP purposes) for the Portsmouth site transition is approximately $130 million. The Company informed the PBGC at the time that it did not agree that the Portsmouth de-lease and transition of employees constituted a cessation of operations that triggered liability under ERISA Section 4062(e). Centrus also disputes the amount of the PBGC's preliminary calculation of the potential ERISA Section 4062(e) liability. In addition, Centrus believes that DOE is responsible for a significant portion of any pension costs associated with the transition of employees at Portsmouth. However, Centrus has not reached a resolution with the PBGC and Centrus has no assurance that the PBGC will agree with it or will not pursue a requirement for it to accelerate funding or take other actions to provide security.
	The PBGC had also previously informally advised the Company that the Paducah de-lease would be a cessation of operations when the 20% employee separation threshold is met and would also trigger liability under ERISA Section 4062(e). The 20% reduction to the active plan participants threshold was reached at Paducah in April 2014. In addition, the PBGC could take the position that a demobilization of the American Centrifuge project, either alone or taken together with the transition of the Paducah and Portsmouth GDPs, creates potential liabilities under ERISA Section 4062(e). In July 2014, the PBGC announced a moratorium, until the end of 2014, on the enforcement of ERISA Section 4062(e) cases. It is unclear what if any impact this may have with respect to the PBGC’s actions with respect to the Company. Regardless of the moratorium on enforcement actions under ERISA Section 4062(e), the PBGC has other authorities under ERISA that it may consider to address the Portsmouth and Paducah transitions or otherwise in connection with Centrus’ qualified defined benefit pension plans. These authorities include, but are not limited to, requiring involuntary termination of underfunded plans and seeking liens or additional funding.
	Legal Matters
	Centrus is subject to various legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. While the outcome of these claims cannot be predicted with certainty, Centrus does not believe that the outcome of any of these legal matters will have a material adverse effect on its results of operations, cash flows or financial condition.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Accumulated Other Comprehensive Income (Loss)	'
	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	The sole component of accumulated other comprehensive income (loss) ("AOCI") is pension and postretirement health and life benefit plans. Amortization of actuarial (gains) losses, net and the amortization of prior service costs (credit) are items reclassified from AOCI and included in the computation of net benefit costs as detailed in Note 14.
	In the nine months ended September 30, 2013, the pension liability (unfunded status) and AOCI declined $138.3 million as a result of the freeze of the defined benefit pension plans in 2013.
	As of September 30, 2014, the Predecessor Company’s accumulated deficit and accumulated other comprehensive loss are eliminated in conjunction with the adoption of fresh start accounting.

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2014
Segment Reporting Information, Revenue for Reportable Segment [Abstract]	'
Segment Information	'
	SEGMENT INFORMATION
	Centrus has two reportable segments: the LEU segment with two components, SWU and uranium, and the contract services segment. The LEU segment is Centrus’ primary business focus and includes sales of the SWU component of LEU, sales of both the SWU and uranium components of LEU, and sales of uranium. The contract services segment consists of contract work performed by Centrus at Portsmouth, Paducah and Oak Ridge. The contract services segment includes revenue and cost of sales for American Centrifuge work Centrus performs under the ACTDO Agreement as a subcontractor to ORNL. Gross profit is Centrus’ measure for segment reporting. There were no intersegment sales in the periods presented.
		Predecessor
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(millions)
	Revenue
	LEU segment:
	Separative work units	$	97.4		$	295.8		$	347.5		$	853.4
	Uranium	—			3.8			—			45.3
		97.4			299.6			347.5			898.7
	Contract services segment	23.3			4.2			43			10.3
		$	120.7		$	303.8		$	390.5		$	909
	Segment Gross Profit (Loss)
	LEU segment	$	(5.9	)	$	(30.8	)	$	(21.9	)	$	(63.7	)
	Contract services segment	0.5			0.8			(0.9		)	0.1
	Gross profit (loss)	$	(5.4	)	$	(30.0	)	$	(22.8	)	$	(63.6	)

Subsequent_Event_Notes

Subsequent Event (Notes)	9 Months Ended
	Sep. 30, 2014
Subsequent Event [Line Items]	'
Subsequent Events [Text Block]	'
	SUBSEQUENT EVENT
	Effective October 17, 2014, John K. Welch stepped down as the President and Chief Executive Officer of Centrus and resigned as a member of the Board of Directors. John R. Castellano, who has served as the Chief Restructuring Officer for the Company since October 2013, now serves as the Interim President and Chief Executive Officer. The Company has begun a process to select the next President and Chief Executive Officer of the Company.
	Mr. Welch will receive severance pay, primarily in the fourth quarter of 2014, pursuant to the Company's Amended and Restated Executive Severance Plan in the amount of approximately $3.5 million, which is the sum of the amount described in (i) and the amount described in (ii), reduced by the amount described in (iii):
	(i)	two times the participant’s Final Eligible Compensation;
	(ii)	the participant’s Prorated Performance Bonus (for the second half of 2014);
	(iii)	the sum of (A) severance or similar payments made pursuant to any Federal, state or local law, including but not limited to payments under the WARN Act, and (B) any termination or severance payments under any other termination or severance plans, policies or programs of the Company that the Participant receives.
	Additionally, Mr. Welch will receive $0.2 million in the first quarter of 2015 for the portion of bonus pay in 2014 that was held back in accordance with the 2013 Quarterly Incentive Plan pending the Company's successful emergence from Chapter 11 bankruptcy.
	In the fourth quarter of 2014, Centrus will record a special charge of $3.3 million for the severance payment (excluding previously accrued bonus amounts) and the value of continued limited-term insurance benefits for Mr. Welch.

Basis_of_Presentation_Basis_of

Basis of Presentation Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
New Accounting Pronouncements, Policy [Policy Text Block]	'
	New Accounting Standards
	In July 2013, the Financial Accounting Standards Board ("FASB") issued guidance requiring an entity to present unrecognized tax benefits as a reduction to deferred tax assets when a net operating loss carryforward, similar tax loss or a tax credit carryforward exists, with limited exceptions. This pronouncement was effective beginning in the first quarter of 2014. The Company has historically presented uncertain tax positions in accordance with the new guidance and the implementation of the guidance did not have a material impact on its consolidated financial statements.
	In April 2014, the FASB issued amendments to guidance for reporting discontinued operations and disposals of components of an entity. The amended guidance changes the definition of a discontinued operation to include only those disposals of components of an entity that represent a strategic shift that has, or will have, a major effect on an entity’s operations and financial results. The amendments also expand the disclosure requirements for discontinued operations and add new disclosures for individually significant dispositions that do not qualify as discontinued operations. The amendments are effective prospectively beginning in the first quarter of 2015 (early adoption is permitted only for disposals that have not been previously reported). The implementation of the amended guidance is not expected to have a material impact on Centrus' results of operations, cash flows or financial position.
	In May 2014, the FASB issued comprehensive new guidance for revenue recognition. The core principle of the new standard is that revenue should be recognized when an entity transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The new standard will supersede current guidance in effect and may require the use of more judgment and estimates, including estimating the amount of variable revenue to recognize over each identified performance obligation. The new standard requires additional disclosures to describe the nature, amount and timing of revenue and cash flows arising from contracts. The new standard will become effective for Centrus beginning with the first quarter of 2017 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. Centrus is evaluating the impact of adopting this new guidance on its consolidated financial statements.
	In August 2014, the FASB issued guidance which will require management to evaluate whether there is substantial doubt about the entity’s ability to continue as a going concern for 12 months following the issuance of the financial statements. In the event there is substantial doubt, the guidance requires disclosure of the relevant facts and circumstances. This standard is effective for annual reporting periods beginning after December 15, 2016, and interim periods thereafter. Early adoption is permitted. Centrus does not expect this standard will have a significant impact on its consolidated financial statements or disclosures.

Fresh_Start_Accounting_Tables

Fresh Start Accounting (Tables)	9 Months Ended
	Sep. 30, 2014
Fresh Start Accounting [Abstract]	'
Reconciliation Of Enterprise Value To Estimated Fair Value [Table Text Block]	'
	Enterprise value	$	299.7
	Less: Fair value of debt	240.4
	Fair value of Successor common stock	$	59.3
	Shares outstanding at September 30, 2014	9
	Per share value	$	6.59
Reconciliation Of Enterprise Value To Estimated Reorganization Value [Table Text Block]	'
	Enterprise value	$	299.7
	Plus non-debt liabilities	763.9
	Reorganization value of Successor assets	$	1,063.60
Schedule of Fresh-Start Adjustments [Table Text Block]	'
	The adjustments set forth in the following condensed consolidated balance sheet reflect the effect of the consummation of the transactions contemplated by the Plan (reflected in the column "Reorganization Adjustments") as well as fair value adjustments as a result of the adoption of fresh start accounting (reflected in the column "Fresh Start Adjustments").
	(in millions)	Predecessor Company, September 30, 2014			Reorganization Adjustments				Fresh Start Adjustments				Successor Company, September 30, 2014
	ASSETS
	Current Assets
	Cash and cash equivalents	$	124.4		$	(19.0	)	(a)	$	—			$	105.4
	Accounts receivable	90			—				—				90
	Inventories	464			—				35.4			(k)	499.4
	Deferred costs associated with deferred revenue	73.9			—				(73.9		)	(l)	—
	Other current assets	21.5			0.1			(b)	—				21.6
	Total current assets	773.8			(18.9		)		(38.5		)		716.4
	Property, plant and equipment	3.7			—				—				3.7
	Deferred taxes	—			—				26.4			(m)	26.4
	Deposits for surety bonds	35.9			—				—				35.9
	Intangible assets	—			—				123.5			(n)	123.5
	Excess reorganization value	—			—				137.2			(o)	137.2
	Other long-term assets	19.8			0.7			(c)	—				20.5
	Total Assets	$	833.2		$	(18.2	)		$	248.6			$	1,063.60
	LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
	Current Liabilities
	Accounts payable and accrued liabilities	$	67.3		$	4.9		(d)	$	7.3		(p)	$	79.5
	Payables under Russian Contract	47.3			—				—				47.3
	Deferred taxes	—			—				26.4			(m)	26.4
	Inventories owed to customers and suppliers	173.1			—				—				173.1
	Deferred revenue	94.7			—				(94.0		)	(l)	0.7
	Total current liabilities	382.4			4.9				(60.3		)		327
	Long-term debt	—			240.4			(e)	—				240.4
	Postretirement health and life benefit obligations	202.4			—				9.2			(p)	211.6
	Pension benefit liabilities	95.9			—				78.2			(p)	174.1
	Other long-term liabilities	51.2			—				—				51.2
	Total liabilities not subject to compromise	731.9			245.3				27.1				1,004.30
	Liabilities subject to compromise
	Convertible senior notes and accrued interest	547.4			(547.4		)	(f)	—				—
	Convertible preferred stock and PIK dividends payable	113.9			(113.9		)	(f)	—				—
	Accounts payable	1.6			(1.6		)	(f)	—				—
	Total liabilities subject to compromise	662.9			(662.9		)		—				—
	Total liabilities	1,394.80			(417.6		)		27.1				1,004.30
	Stockholders’ Equity (Deficit)
	Common stock (Predecessor)	0.5			—				(0.5		)	(q)	—
	Excess of capital over par value (Predecessor)	1,221.50			0.4			(g)	(1,221.9		)	(q)	—
	Treasury stock (Predecessor)	(38.8		)	—				38.8			(q)	—
	Accumulated other comprehensive loss, net of tax (Predecessor)	(119.5		)	(2.2		)	(h)	121.7			(q)	—
	Common stock (Successor)	—			0.9			(i)	—				0.9
	Excess of capital over par value (Successor)	—			58.4			(i)	—				58.4
	Retained earnings (deficit)	(1,625.3		)	341.9			(j)	1,283.40			(q)	—
	Total stockholders’ equity (deficit)	(561.6		)	399.4				221.5				59.3
	Total Liabilities and Stockholders’ Equity (Deficit)	$	833.2		$	(18.2	)		$	248.6			$	1,063.60
Schedule Of Cash Payments For Reorganization Adjustments [Table Text Block]	'
	Payment of claims for interest payable on the Old Notes at the non-default rate	$	15.9
	Payment of professional fees	1.5
	Payment of unsecured pre-petition claims	1.6
	Net decrease in cash	$	19
Schedule Of Cumulative Impact Of Reorganization Adjustments [Table Text Block]	'
	Extinguishment of Predecessor claims pursuant to the Plan:
	Convertible senior notes and accrued interest	$	547.4
	Convertible preferred stock and PIK dividends payable	113.9
	Accounts payable	1.6
	Total liabilities subject to compromise	$	662.9
	Total consideration given pursuant to the Plan:
	New Notes	$	(240.4	)
	Issuance of 95% of New Common Stock to holders of Old Notes and Old Preferred Stock	(56.4		)
	Cash payments for interest payable on Old Notes at the non-default rate	(15.9		)
	Cash payments to holders of unsecured claims	(1.6		)
	Total settlements on liabilities subject to compromise	$	(314.3	)
	Gain on extinguishment of pre-petition liabilities	$	348.6
	Other adjustments to accumulated deficit:
	Benefit accrual freeze on SERP plans	$	2.2
	Cancellation of restricted stock and restricted stock units	(0.4		)
	Deferred financing costs	0.7
	Professional fees accrued at the emergence	(6.3		)
	Total other reorganization expenses	$	(3.8	)
	Issuance of 5% of New Common Stock to holders of Old Common Stock	(2.9		)
	Total adjustment to retained deficit (earnings)	$	341.9
Schedule Of Allocation of Reorganization Value to Assets [Table Text Block]	'
	Enterprise value	$	299.7
	Add: Fair value of liabilities excluded from enterprise value	763.9
	Less: Fair value of tangible assets	(802.9		)
	Less: Fair value of identified intangible assets	(123.5		)
	Reorganization value of Successor assets in excess of amounts allocated to identified tangible and intangible assets	$	137.2
Schedule Of Cumulative Impact Of Fresh Start Adjustments [Table Text Block]	'
	Establishment of Successor Company’s excess reorganization value	$	137.2
	Establishment of Successor Company’s other intangible assets	123.5
	Inventory fair value adjustments	35.4
	Deferred costs and deferred revenue fair value adjustments	20.1
	Pension and postretirement remeasurement	(94.7		)
	Gain on revaluation of assets and liabilities	$	221.5
	Cancellation of accumulated other comprehensive income	(121.7		)
	Total gain on fresh start accounting adjustments	$	99.8
	Cancellation of Predecessor Company equity	1,183.60
	Total adjustment to retained deficit (earnings)	$	1,283.40

Reorganization_Items_Net_Table

Reorganization Items, Net (Tables)	9 Months Ended
	Sep. 30, 2014
Reorganizations Items, Net [Abstract]	'
Reorganization Items, Net [Table Text Block]	'
	The following is a summary of charges (credits) related to the Company's bankruptcy filing and reorganization (in millions).
		Predecessor
		Three Months Ended			Nine Months Ended
		September 30, 2014			September 30, 2014
	Professional fees	$	10.4		$	22.3
	Expense of deferred financing costs on convertible senior notes	—			1.2
	Effects of Plan:
	Gain on cancellation of convertible senior notes, net	(284.7		)	(284.7		)
	Gain on cancellation of convertible preferred stock, net	(64.1		)	(64.1		)
	Expense of unamortized restricted stock	0.4			0.4
	Gain related to the freeze of SERP benefits	(2.2		)	(2.2		)
	Fresh Start Adjustments:
	Revaluation of deferred revenue, net of deferred costs	(20.1		)	(20.1		)
	Revaluation of inventory	(35.4		)	(35.4		)
	Valuation of intangible assets	(260.7		)	(260.7		)
	Remeasurement of pension and postretirement benefit obligations	94.7			94.7
	Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations	121.7			121.7
	Reorganization items, net	$	(440.0	)	$	(426.9	)

Transition_Charges_Restructuri

Transition Charges Restructuring and Related Activities (Tables)	9 Months Ended
	Sep. 30, 2014
Reorganizations [Abstract]	'
Restructuring and Related Costs [Table Text Block]	'
	A summary of special charges recorded in the year ended December 31, 2013 and the nine months ended September 30, 2014, and changes in the related balance sheet accounts, follow (in millions):
		Predecessor																Successor
		Liability Balance to Be Paid,		2013 Special Charges			2013			Liability Balance to Be Paid,		Year-to-Date 2014 Special Charges			Year-to-Date 2014			Liability Balance to Be Paid,
		Dec. 31, 2012					Paid			Dec. 31, 2013					Paid			Sep. 30, 2014
	Workforce reductions, primarily severance payments	$	—	$	25.2		$	(4.0	)	$	21.2	$	4.5		$	(13.6	)	$	12.1
	Less: Amounts billed to DOE	—		(1.2		)	na			na		(2.4		)	na			na
	Pension and postretirement benefit charges, non-cash	—		22.2			na			na		—			na			na
	Advisory costs	0.1		11			(9.9		)	1.2		—			(1.2		)	—
		$	0.1	$	57.2		$	(13.9	)	$	22.4	$	2.1		$	(14.8	)	$	12.1

Accounts_Receivable_Tables

Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2014
Accounts Receivable, Net, Current [Abstract]	'
Schedule of Accounts Receivable	'
		Successor		Predecessor
	($ millions)	September 30,		31-Dec-13
		2014
	Utility customers and other	$	67.9	$	129.3
	DOE cost share of Cooperative Agreement funding	—		20.1
	Contract services, primarily DOE	22.1		13.6
	Accounts receivable	$	90	$	163

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2014
Inventory, Net [Abstract]	'
Schedule of Inventories	'
	Components of inventories follow (in millions):
		Successor						Predecessor
		September 30, 2014						December 31, 2013
		Current		Current		Inventories, Net		Current		Current		Inventories, Net
		Assets		Liabilities				Assets		Liabilities
				(a)						(a)
	Separative work units	$	412.6	$	91.5	$	321.1	$	628.4	$	200	$	428.4
	Uranium	86.3		81.6		4.7		335.4		299.7		35.7
	Materials and supplies	0.5		—		0.5		3.8		—		3.8
		$	499.4	$	173.1	$	326.3	$	967.6	$	499.7	$	467.9
	(a)	Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators.

Property_Plant_and_Equipment_P1

Property, Plant and Equipment Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment	'
	A summary of changes in property, plant and equipment follows (in millions):
		Predecessor												Successor
		December 31,			Capital Expenditures (Depreciation)			Retirements			Fresh Start Adjustments			September 30,
		2013												2014
	Leasehold improvements	$	141.1		$	—		$	(138.4	)	$	(2.7	)	$	—
	Machinery and equipment	164			—			(118.6		)	(41.7		)	3.7
		305.1			—			(257.0		)	(44.4		)	3.7
	Accumulated depreciation and amortization	(297.2		)	(4.0		)	256.8			44.4			—
		$	7.9		$	(4.0	)	$	(0.2	)	$	—		$	3.7
	In connection with the application of fresh start accounting, the gross property, plant and equipment value is adjusted to the net carrying value, and therefore accumulated depreciation and amortization is eliminated as of the Effective Date.
	During 2014, the Company entered into a commission sales agreement with a third-party auctioneer to assist in Paducah GDP asset disposals. Paducah related auctions held during the second and third quarters of 2014 as well as direct sales at Paducah and other sites of $8.9 million are included in other income less asset retirements and related sales expense. Cash proceeds totaled $8.4 million. Additional sales of assets and property are planned.

Intangible_Assets_Tables

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Intangible Assets Disclosure [Abstract]	'
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block]	'
				Successor
	($ millions)	Weighted Average Useful Life		September 30,
				2014
	Amortizable intangible assets:
	Backlog	(a)		$	54.6
	Customer relationships	15 years		68.9
	Total			$	123.5
	Nonamortizable intangible assets:
	Excess reorganizational value			$	137.2
	(a) The backlog intangible asset is amortized as delivery is made to the customer, reflecting the use of the asset.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	2014	$	3.9
	2015	12.9
	2016	12.9
	2017	10.8
	2018	10.8
	Thereafter	72.2
		$	123.5

Accounts_Payable_and_Accrued_L1

Accounts Payable and Accrued Liabilities (Tables)	9 Months Ended
	Sep. 30, 2014
Accounts Payable and Accrued Liabilities [Abstract]	'
Schedule of Accrued Liabilities [Table Text Block]	'
	ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
		Successor		Predecessor
	($ millions)	September 30,		December 31,
		2014		2013
	Trade payables (a)	$	19.3	$	8.7
	Compensation and benefits (b)	27.6		27.3
	Severance	12.1		21.2
	Lease turnover costs	—		30.4
	Other accrued liabilities	20.5		26.9
		$	79.5	$	114.5
	(a) Includes success fees accrued at emergence at September 30, 2014. See Note 3.
	(b) Includes current portion of remeasurement of unfunded pension benefit liability at September 30, 2014. See Note 3.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Financial Instruments Recorded at Fair Value	'
	Financial Instruments Recorded at Fair Value
		Fair Value Measurements
		(in millions)
		Successor											Predecessor
		September 30, 2014											December 31, 2013
		Level 1		Level 2			Level 3		Total				Level 1	Level 2		Level 3	Total
	Assets:
	Cash equivalents (a)	—		$	90.6		—		$	90.6			—	$	312.7	—	$	312.7
	Deferred compensation asset (b)	—		3.1			—		3.1				—	3.1		—	3.1
	Liabilities:
	Deferred compensation obligation (b)	—		2.9			—		2.9				—	3		—	3
	(a)	Cash equivalents consist of funds invested in institutional money market funds. These investments are classified within Level 2 of the valuation hierarchy because the publicly reported Net Asset Value (“NAV”) of one dollar does not necessarily reflect the fair value of the underlying securities.
	(b)	The deferred compensation obligation represents the balance of deferred compensation plus net investment earnings. The deferred compensation plan is informally funded through a rabbi trust using variable universal life insurance. The cash surrender value of the life insurance policies is designed to track the deemed investments of the plan participants. Investment crediting options consist of institutional and retail investment funds. The deemed investments are classified within Level 2 of the valuation hierarchy because (i) of the indirect method of investing and (ii) unit prices of institutional funds are not quoted in active markets.
Schedule of Fair Value of Debt	'
	The balance sheet carrying amounts and estimated fair values of the Company’s New Notes and former Old Notes follow (in millions):
		Successor						Predecessor
		September 30, 2014						December 31, 2013
		Carrying Value			Fair Value			Carrying Value			Fair Value
	8% PIK toggle notes	$	240.4		$	240.4		-			-
	Convertible senior notes, excluding accrued interest	-			-			$	530		$	184.1

Pension_and_Postretirement_Hea1

Pension and Postretirement Health and Life Benefits (Tables)	9 Months Ended
	Sep. 30, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]	'
Schedule of Net Benefit Costs	'
		Predecessor
		Defined Benefit Pension Plans												Postretirement Health and Life Benefit Plans
		Three Months Ended						Nine Months Ended						Three Months Ended						Nine Months Ended
		September 30,						September 30,						September 30,						September 30,
		2014			2013			2014			2013			2014			2013			2014			2013
	Service costs	$	0.6		$	1.4		$	1.8		$	8.8		$	0.4		$	0.9		$	1.3		$	2.7
	Interest costs	10.6			11.5			31.7			33.5			2.5			2.2			7.5			6.7
	Expected returns on plan assets (gains)	(12.9		)	(12.8		)	(38.5		)	(38.3		)	(0.5		)	(0.5		)	(1.5		)	(1.7		)
	Amortization of actuarial (gains) losses, net	0.4			2			1			14.2			—			0.6			—			2
	Amortization of prior service costs (credits)	—			—			—			0.7			(0.1		)	—			(0.3		)	—
	Curtailment (gains)	(2.2		)	—			(2.2		)	(0.7		)	—			—			—			—
	Net benefit costs (credits)	$	(3.5	)	$	2.1		$	(6.2	)	$	18.2		$	2.3		$	3.2		$	7		$	9.7

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Share-based Compensation [Abstract]	'
Schedule of Stock-Based Compensation Costs	'
		Predecessor
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(millions)
	Total stock-based compensation costs:
	Restricted stock and restricted stock units	$	0.1	$	0.3	$	0.6	$	1.6
	Stock options, performance awards and other	—		—		—		0.1
	Expense included in selling, general and administrative and advanced technology costs	$	0.1	$	0.3	$	0.6	$	1.7
	Total recognized tax benefit	$	—	$	—	$	—	$	—

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Net Income Per Share	'
		Predecessor
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014				2013
		(millions)
	Numerators:
	Income (loss) from continuing operations	$	418.9		$	(44.3	)	$	340.1			$	(108.9	)
	Income from discontinued operations	—			—			—				21.7
	Net income (loss)	$	418.9		$	(44.3	)	$	340.1			$	(87.2	)
	Interest expense on convertible notes (a)	3			—			9				—
	Net income if-converted - diluted	$	421.9		$	(44.3	)	$	349.1			$	(87.2	)
	Denominator:
	Weighted average common shares	5			5			5				5
	Less: Weighted average unvested restricted stock	0.1			0.1			0.1				0.1
	Denominator for basic calculation	4.9			4.9			4.9				4.9
	Weighted average effect of dilutive securities:
	Convertible notes	1.8			1.8			1.8				1.8
	Convertible preferred stock:
	Equivalent common shares (b)	35.8			13.7			27.2				10.5
	Less: share issuance limitation (c)	34.9			12.8			26.3				9.6
	Net allowable common shares	0.9			0.9			0.9				0.9
	Subtotal	2.7			2.7			2.7				2.7
	Less: shares excluded in a period of a net loss or antidilution	—			2.7			—				2.7
	Weighted average effect of dilutive securities	2.7			—			2.7				—
	Denominator for diluted calculation	7.6			4.9			7.6				4.9
	Income (loss) per share from continuing operations – basic	$	85.49		$	(9.04	)	$	69.41			$	(22.22	)
	Income (loss) per share from continuing operations – diluted	$	55.51		$	(9.04	)	$	45.93			$	(22.22	)
	Income per share from discontinued operations – basic and diluted	$	—		$	—		$	—			$	4.43
	Net income (loss) per share – basic	$	85.49		$	(9.04	)	$	69.41			$	(17.79	)
	Net income (loss) per share – diluted	$	55.51		$	(9.04	)	$	45.93			$	(17.79	)
	(a)	Interest expense on Old Notes and Old Preferred Stock dividends was $5.1 million in the three months ended September 30, 2013 and $15.2 million in the nine months ended September 30, 2013. The tax rate is the statutory rate.
	No dilutive effect is recognized in a period in which a net loss has occurred. In addition, for purposes of calculating income from discontinued operations per share, the calculation of (loss) from continuing operations per share provides a control number in determining whether potential common shares are dilutive or antidilutive. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss (discontinued operations and net income/loss), regardless of their antidilutive effect on such categories. Therefore, no dilutive effect is recognized in the calculation of income from discontinued operations per share.
	(b)	The number of equivalent shares of Old Common Stock for the Old Preferred Stock was based on the arithmetic average of the daily volume weighted average prices per share of Old Common Stock for each of the last 20 trading days, and was determined as of the beginning of the period for purposes of calculating diluted net income per share.
	(c)	Prior to obtaining shareholder approval, the Company's Old Preferred Stock could not have been converted into an aggregate number of shares of Old Common Stock in excess of 19.99% of the shares of Old Common Stock outstanding on May 25, 2010 (approximately 0.9 million shares adjusted to take into account the 1-for-25 reverse stock split), in compliance with the rules of the NYSE. If a share issuance limitation were to exist at the time of share conversion or sale, any shares of Old Preferred Stock subject to the share issuance limitation would have been subject to optional or mandatory redemption for, at the Company's option, cash or SWU consideration. However, the Company’s ability to redeem may have been limited by Delaware law and the Bankruptcy Code.
Schedule of Securities Excluded from Net Income Per Share	'
	Options and warrants to purchase shares of Old Common Stock having an exercise price greater than the average share market price are excluded from the calculation of diluted net income per share:
		Predecessor
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2014				2013				2014					2013
	Options excluded from diluted net income per share	200				1,000				200					1,000
	Warrants excluded from diluted net income per share	250,000				250,000				250,000					250,000
	Exercise price of excluded options	$	283.25	to		$	177.5	to		$	283.25		to		$	177.5	to
		$	357			$	357			$	357				$	357
	Exercise price of excluded warrants	$	187.5			$	187.5			$	187.5				$	187.5

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting Information, Revenue for Reportable Segment [Abstract]	'
Segment Reporting Information	'
		Predecessor
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(millions)
	Revenue
	LEU segment:
	Separative work units	$	97.4		$	295.8		$	347.5		$	853.4
	Uranium	—			3.8			—			45.3
		97.4			299.6			347.5			898.7
	Contract services segment	23.3			4.2			43			10.3
		$	120.7		$	303.8		$	390.5		$	909
	Segment Gross Profit (Loss)
	LEU segment	$	(5.9	)	$	(30.8	)	$	(21.9	)	$	(63.7	)
	Contract services segment	0.5			0.8			(0.9		)	0.1
	Gross profit (loss)	$	(5.4	)	$	(30.0	)	$	(22.8	)	$	(63.6	)

Basis_of_Presentation_Narrativ

Basis of Presentation (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2014
Reduction in amount of third party debt obligations	'	55.00%
Gain on sale of subsidiary	$35.60	'

Energence_From_Voluntary_Reorg1

Energence From Voluntary Reorganization Under Chapter 11 Proceedings Energence From Voluntary Reorganization Under Chapter 11 Proceedings (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014
Chapter 11 Filing [Abstract]	'
Total Stock, Shares Authorized	120,000,000
Preferred Stock, Shares Authorized	20,000,000
Common Stock, Shares, Issued	9,000,000
Long-term debt	$240.40
Convertible senior notes	530
Convertible Noteholders, Percent of New Common Stock	79.04%
Convertible Noteholders, New Notes	200
Preferred Stock, Dividend Rate, Percentage	12.75%
Preferred Stock, Shares Outstanding	85,903
Convertible preferred stock (Predecessor), 85,900 shares issued	113.9
Class of Warrant or Right, Outstanding	250,000
Preferred Investors, Each, Percent of New Common Stock	7.98%
Preferred Investors, Aggregate, Percent of New Common Stock	15.96%
Preferred Investors, Each, New Notes	20.19
Preferred Investors, Aggregate, New Notes	40.38
Stockholders, Percent of New Common Stock	5.00%
Debtor in possession financing repayments	$16.30
Common Class A [Member]	'
Chapter 11 Filing [Abstract]	'
Common Stock, Shares Authorized	70,000,000
Common Stock, Shares, Issued	7,563,600
Common Class B [Member]	'
Chapter 11 Filing [Abstract]	'
Common Stock, Shares Authorized	30,000,000
Common Stock, Shares, Issued	1,436,400

Fresh_Start_Accounting_Details

Fresh Start Accounting (Details) (USD $)	3 Months Ended	9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014
Payments of Financing Costs	$0.70	'
Long-term Debt	240.4	240.4
Liabilities Subject to Compromise, 3% Convertible Senior Notes and Accrued Interest	547.4	547.4
Liabilities Subject to Compromise, Convertible Preferred Stock and Paid-in-Kind Dividends Payable	113.9	113.9
Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities	1.6	1.6
Liabilities subject to compromise	662.9	662.9
Fresh-Start Adjustment, Increase (Decrease), Inventories	35.4	35.4
Fresh-Start Adjustment, Increase (Decrease), Prepaid and Other Current Assets	73.9	73.9
Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities	94	94
Revaluation of deferred revenue, net of deferred costs	20.1	20.1
Fresh-Start Adjustment, Increase (Decrease), Amortizable Intangible Assets	123.5	123.5
Successor [Member]	'	'
Enterprise Value	299.7	299.7
Long-term Debt	240.4	240.4
Common Stock, Value, Outstanding	59.3	59.3
Common Stock, Shares, Outstanding	9	9
Shares Issued, Price Per Share	$6.59	$6.59
Other Liabilities, Fair Value Disclosure	763.9	763.9
Reorganization Value	1,063.60	1,063.60
Interest Paid	15.9	'
Payments for Fees	1.5	'
Payment of Claims	1.6	'
Payment of Reorganization Adjustments	19	'
Liabilities subject to compromise	0	0
Intangible assets	123.5	123.5
Contract-Based Intangible Assets [Member]	'	'
Intangible assets	54.6	54.6
Contract-Based Intangible Assets [Member] | Successor [Member]	'	'
Intangible assets	$54.60	$54.60

Fresh_Start_Accounting_Schedul

Fresh Start Accounting Schedule of Fresh-Start Adjustments (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current Liabilities	'	'	'	'
Convertible senior notes (Predecessor)	'	$530	'	'
Convertible preferred stock (Predecessor), 85,900 shares issued	113.9	'	'	'
Long-term debt	240.4	'	'	'
Liabilities Subject to Compromise, 3% Convertible Senior Notes and Accrued Interest	547.4	'	'	'
Liabilities Subject to Compromise, Convertible Preferred Stock and Paid-in-Kind Dividends Payable	113.9	'	'	'
Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities	1.6	'	'	'
Liabilities subject to compromise	662.9	'	'	'
Retained earnings (deficit)	0	'	'	'
Treasury stock	0	'	'	'
Accumulated other comprehensive income (loss), net of tax	0	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract]	'	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Cash and Cash Equivalents	-19	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Inventories	35.4	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Prepaid and Other Current Assets	-73.9	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Current Assets	-38.5	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Assets, Noncurrent	26.4	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Amortizable Intangible Assets	123.5	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Excess Reorganization Value	137.2	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Other Assets, Noncurrent	0.7	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Assets	248.6	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract]	'	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Accrued Liabilities	7.3	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Liabilities, Current	26.4	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities	-94	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Other Long-term Debt	240.4	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Pension Obligations	9.2	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Other Postretirement Obligations	78.2	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Liabilities	27.1	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract]	'	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Common Stock	-0.5	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Additional Paid-in Capital	-1,221.90	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Treasury Stock	38.8	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Accumulated Other Comprehensive Income (Loss)	121.7	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Retained Earnings (Deficit)	1,283.40	'	'	'
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity	221.5	'	'	'
Predecessor [Member]	'	'	'	'
Current Assets	'	'	'	'
Cash and cash equivalents	105.4	314.2	128.4	292.9
Accounts receivable	'	163	'	'
Inventories	'	967.6	'	'
Deferred costs associated with deferred revenue	'	165.5	'	'
Other current assets	'	21.7	'	'
Total current assets	'	1,632	'	'
Property, plant and equipment, net	'	7.9	'	'
Deferred income taxes	'	0	'	'
Deposits for surety bonds	'	39.8	'	'
Intangible assets	'	0	'	'
Excess reorganization value	'	0	'	'
Other long-term assets	'	25.8	'	'
Total Assets	'	1,705.50	'	'
Current Liabilities	'	'	'	'
Accounts payable and accrued liabilities	'	114.5	'	'
Payables under Russian Contract	'	340.7	'	'
Deferred income taxes	'	0	'	'
Inventories owed to customers and suppliers	'	499.7	'	'
Deferred revenue	'	195.9	'	'
Convertible senior notes (Predecessor)	'	530	'	'
Convertible preferred stock (Predecessor), 85,900 shares issued	'	113.9	'	'
Total current liabilities	'	1,794.70	'	'
Long-term debt	'	0	'	'
Postretirement health and life benefit obligations	'	195	'	'
Pension benefit liabilities	'	121.2	'	'
Other long-term liabilities	'	52.8	'	'
Total liabilities	'	2,163.70	'	'
Commitments and contingencies (Note 19)	'	'	'	'
Common stock	'	0.5	'	'
Excess of capital over par value	'	1,216.40	'	'
Retained earnings (deficit)	'	-1,520.70	'	'
Treasury stock	'	-34.3	'	'
Accumulated other comprehensive income (loss), net of tax	'	-120.1	'	'
Total stockholders’ equity (deficit)	59.3	-458.2	-462.1	-472.9
Total Liabilities and Stockholders’ Equity (Deficit)	'	1,705.50	'	'
Successor [Member]	'	'	'	'
Current Assets	'	'	'	'
Cash and cash equivalents	105.4	'	'	'
Accounts receivable	90	'	'	'
Inventories	499.4	'	'	'
Deferred costs associated with deferred revenue	0	'	'	'
Other current assets	21.6	'	'	'
Total current assets	716.4	'	'	'
Property, plant and equipment, net	3.7	'	'	'
Deferred income taxes	26.4	'	'	'
Deposits for surety bonds	35.9	'	'	'
Intangible assets	123.5	'	'	'
Excess reorganization value	137.2	'	'	'
Other long-term assets	20.5	'	'	'
Total Assets	1,063.60	'	'	'
Current Liabilities	'	'	'	'
Accounts payable and accrued liabilities	79.5	'	'	'
Payables under Russian Contract	47.3	'	'	'
Deferred income taxes	26.4	'	'	'
Inventories owed to customers and suppliers	173.1	'	'	'
Deferred revenue	0.7	'	'	'
Convertible senior notes (Predecessor)	0	'	'	'
Convertible preferred stock (Predecessor), 85,900 shares issued	0	'	'	'
Total current liabilities	327	'	'	'
Long-term debt	240.4	'	'	'
Postretirement health and life benefit obligations	211.6	'	'	'
Pension benefit liabilities	174.1	'	'	'
Other long-term liabilities	51.2	'	'	'
Liabilities subject to compromise	0	'	'	'
Total liabilities	1,004.30	'	'	'
Commitments and contingencies (Note 19)	'	'	'	'
Common stock	0.9	'	'	'
Excess of capital over par value	58.4	'	'	'
Retained earnings (deficit)	0	'	'	'
Total stockholders’ equity (deficit)	59.3	'	'	'
Total Liabilities and Stockholders’ Equity (Deficit)	1,063.60	'	'	'
Pre Eliminations [Member] | Predecessor [Member]	'	'	'	'
Current Assets	'	'	'	'
Cash and cash equivalents	124.4	'	'	'
Accounts receivable	90	'	'	'
Inventories	464	'	'	'
Deferred costs associated with deferred revenue	73.9	'	'	'
Other current assets	21.5	'	'	'
Total current assets	773.8	'	'	'
Property, plant and equipment, net	3.7	'	'	'
Deferred income taxes	0	'	'	'
Deposits for surety bonds	35.9	'	'	'
Intangible assets	0	'	'	'
Excess reorganization value	0	'	'	'
Other long-term assets	19.8	'	'	'
Total Assets	833.2	'	'	'
Current Liabilities	'	'	'	'
Accounts payable and accrued liabilities	67.3	'	'	'
Payables under Russian Contract	47.3	'	'	'
Deferred income taxes	0	'	'	'
Inventories owed to customers and suppliers	173.1	'	'	'
Deferred revenue	94.7	'	'	'
Total current liabilities	382.4	'	'	'
Long-term debt	0	'	'	'
Postretirement health and life benefit obligations	202.4	'	'	'
Pension benefit liabilities	95.9	'	'	'
Other long-term liabilities	51.2	'	'	'
Liabilities Subject to Compromise, 3% Convertible Senior Notes and Accrued Interest	547.4	'	'	'
Liabilities Subject to Compromise, Convertible Preferred Stock and Paid-in-Kind Dividends Payable	113.9	'	'	'
Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities	1.6	'	'	'
Liabilities subject to compromise	662.9	'	'	'
Total liabilities	1,394.80	'	'	'
Common stock	0.5	'	'	'
Excess of capital over par value	1,221.50	'	'	'
Retained earnings (deficit)	-1,625.30	'	'	'
Treasury stock	38.8	'	'	'
Accumulated other comprehensive income (loss), net of tax	-119.5	'	'	'
Total stockholders’ equity (deficit)	-561.6	'	'	'
Total Liabilities and Stockholders’ Equity (Deficit)	$833.20	'	'	'

Reorganization_Items_Net_Detai

Reorganization Items, Net (Details) (USD $)	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014
Reorganizations Items, Net [Abstract]	'	'
Reorganization items, professional fees	$10.40	$22.30
Reorganization items, expense of deferred financing costs	0	1.2
Gain on cancellation of convertible senior notes, net	-284.7	-284.7
Gain on cancellation of convertible preferred stock, net	-64.1	-64.1
Expense of unamortized restricted stock	0.4	0.4
Gain related to the freeze of SERP benefits	-2.2	-2.2
Revaluation of deferred revenue, net of deferred costs	-20.1	-20.1
Revaluation of inventory	-35.4	-35.4
Valuation of intangible assets	-260.7	-260.7
Remeasurement of pension and postretirement benefit obligations	94.7	94.7
Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations	121.7	121.7
Reorganization items, net	-440	-426.9
Reorganization items, net, paid	6.6	15.6
Accrued professional fees, current	$6.70	$6.70

Transition_Charges_NarrativeDe

Transition Charges (Narrative)(Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

18 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2012

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2012

Cash Payable [Member]

Cash Payable [Member]

Severance [Member]

Severance [Member]

Noncash [Member]

Advisory Costs [Member]

Advisory Costs [Member]

Advisory Costs [Member]

Restructuring Cost and Reserve [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Inventory Valuation Adjustments

$1.80

$5

$13.50

$15

'

'

'

'

'

'

'

'

'

'

'

Non-production expenses

17.5

47.7

66.7

123.4

'

'

'

'

'

'

'

'

'

'

'

Site expenses

15.6

37.4

51.3

63.8

'

'

'

'

'

'

'

'

'

'

'

Accelerated property, plant and equipment expenses

'

5.3

1.9

13.5

'

'

'

'

'

'

'

'

'

'

'

Asset retirement charges

'

19.3

'

'

'

'

'

'

'

'

'

'

'

'

'

Power contract losses

'

'

'

11.8

'

'

'

'

'

'

'

'

'

'

'

One-time termination benefit costs

0.3

'

4.5

'

'

29.7

'

4.5

25.2

'

'

'

'

'

'

Payments for one-time termination benefits

'

'

-14.8

'

-13.9

'

'

'

'

-4

-13.6

'

-1.2

-9.9

'

DOE Share of Paducah Termination Benefit Costs

-0.2

'

-2.4

'

-1.2

-3.6

'

'

'

'

'

'

'

'

'

Structuring advisory costs

'

'

'

6.7

11

'

'

'

'

'

'

'

'

'

'

Restructuring Liability Balance

12.1

'

12.1

'

22.4

'

0.1

'

'

21.2

12.1

'

'

1.2

0.1

Restructuring Charges

'

'

2.1

'

57.2

'

'

'

'

'

'

22.2

'

'

'

Reorganization items, professional fees

$10.40

'

$22.30

'

'

'

'

'

'

'

'

'

'

'

'

Advanced_Technology_Costs_and_1

Advanced Technology Costs and Other Income (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended	23 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Apr. 30, 2014
ACTDO DOE Funding – Increment 1	'	$33.70	'
RD&D Program Funding by DOE	'	'	79.50%
RD&D Program Funding by USEC	'	'	20.50%
RD&D Program Qualifying Expenditures - Total	352.2	352.2	'
RD&D Program Qualifying Expenditures - DOE Share Total	280	280	'
RD&D Program Qualifying Expenditures – USEC Share Total	72.2	72.2	'
Advanced technology costs	5.3	12.3	'
Scenario, Forecast [Member]	'	'	'
Maximum RD&D Program Funding by DOE	'	'	280
RD&D Program Funding by DOE	'	'	80.00%
RD&D Program Funding by USEC	'	'	20.00%

Accounts_Receivable_Details

Accounts Receivable (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Government [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Accounts Receivable, Gross, Noncurrent	$75	$81	$38
Accounts Receivable, Net, Noncurrent	19.8	'	'
Successor [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Utility Customer Receivables	67.9	'	'
DOE pro-rata share of Cooperative Agreement funding	0	'	'
Contract Services Customer Receivables	22.1	'	'
Accounts Receivable, Net	90	'	'
Predecessor [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Utility Customer Receivables	'	129.3	'
DOE pro-rata share of Cooperative Agreement funding	'	20.1	'
Contract Services Customer Receivables	'	13.6	'
Accounts Receivable, Net	'	$163	'

Accounts_Receivable_Narrative_

Accounts Receivable (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Government [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Accounts Receivable, Gross, Noncurrent	$75	$81	$38
Proceeds from DOE on Claims	6	'	'
Accounts Receivable, Net, Noncurrent	19.8	'	'
Other long-term liabilities	19.6	19.7	'
Corporation [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Accounts Receivable, Gross, Noncurrent	3.8	'	'
Government - portion related to retiree benefits [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Accounts Receivable, Gross, Noncurrent	$42.80	'	'

Inventories_Details

Inventories (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Successor [Member]	Predecessor [Member]
Inventory [Line Items]	'	'
Separative work units inventory	$412.60	$628.40
Uranium inventory	86.3	335.4
Materials and supplies	0.5	3.8
Inventories	499.4	967.6
Separative work units owed to customers and suppliers	91.5	200
Uranium owed to customers and suppliers	81.6	299.7
Inventories owed to customers and suppliers	173.1	499.7
Separative work units net of liability	321.1	428.4
Uranium inventory net of liability	4.7	35.7
Inventories, net	$326.30	$467.90

Inventories_Narrative_Details

Inventories (Narrative) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory, Net [Abstract]	'	'
Fresh-Start Adjustment, Increase (Decrease), Inventories	$35.40	'
Inventories provided by customers and suppliers	$698	$1,300
Decline in Uranium Quantities Provided by Customers and Suppliers	46.00%	'

Property_Plant_and_Equipment_P2

Property, Plant and Equipment Property, Plant and Equipment (Tables) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Successor [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Gross	$3.70
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	0
Property, Plant and Equipment, Net	3.7
Successor [Member] | Leasehold Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Gross	0
Successor [Member] | Machinery and Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Gross	3.7
Predecessor [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Gross	305.1
Property, Plant and Equipment, Transfers and Changes	-257
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	-297.2
Depreciation	-4
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment	256.8
Property, Plant and Equipment, Net	7.9
Accumulated Depreciation, Depletion and Amortization, Write-down of Property, Plant and Equipment	-0.2
Fresh-Start Adjustment, Increase (Decrease), Other Property and Equipment	-44.4
Fresh-Start Adjustment, Increase (Decrease), Accumulated Depreciation and Amortization	44.4
Predecessor [Member] | Leasehold Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Gross	141.1
Property, Plant and Equipment, Transfers and Changes	-138.4
Fresh-Start Adjustment, Increase (Decrease), Leasehold Improvements	-2.7
Predecessor [Member] | Machinery and Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Gross	164
Property, Plant and Equipment, Transfers and Changes	-118.6
Fresh-Start Adjustment, Increase (Decrease), Other Property and Equipment	($41.70)

Property_Plant_and_Equipment_P3

Property, Plant and Equipment Property, Plant and Equipment (Narrative) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Gain (Loss) on Disposition of Property Plant Equipment	$8.90
Proceeds from Sale of Property, Plant, and Equipment	$8.40

Intangible_Assets_Schedule_of_

Intangible Assets Schedule of Future Amortization (Details) (USD $)	Sep. 30, 2014
In Millions, unless otherwise specified
Intangible Assets Disclosure [Abstract]	'
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$3.90
Finite-Lived Intangible Assets, Amortization Expense, Year Two	12.9
Finite-Lived Intangible Assets, Amortization Expense, Year Three	12.9
Finite-Lived Intangible Assets, Amortization Expense, Year Four	10.8
Finite-Lived Intangible Assets, Amortization Expense, Year Five	10.8
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	72.2
Finite-Lived Intangible Assets, Net	$123.50

Intangible_Assets_Schedule_of_1

Intangible Assets Schedule of Intangible Assets and Excess Reorganization Value (Details) (USD $)	Sep. 30, 2014
In Millions, unless otherwise specified
Contract-Based Intangible Assets [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Intangible assets	$54.60
Successor [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Intangible assets	123.5
Excess reorganization value	137.2
Successor [Member] | Contract-Based Intangible Assets [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Intangible assets	54.6
Successor [Member] | Customer-Related Intangible Assets [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Intangible assets	$68.90

Accounts_Payable_and_Accrued_L2

Accounts Payable and Accrued Liabilities (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Successor [Member]	Predecessor [Member]
Accounts Payable, Other, Current	$19.30	$8.70
Compensation and Benefits Payable	27.6	27.3
Accrued Severance	12.1	21.2
Accrued Lease Turnover, Current	0	30.4
Other Accrued Liabilities, Current	20.5	26.9
Accounts Payable and Accrued Liabilities, Current	$79.50	$114.50

Debt_Details

Debt (Details) (USD $)	Sep. 30, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'
Long-term debt	$240.40
Payment in Kind (PIK) Note [Member]	'
Debt Instrument [Line Items]	'
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Debt Interest Rate, Cash	3.00%
Debt Interest Rate, PIK	5.50%

Fair_Value_Measurements_Financ

Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Cash equivalents	$90.60	$312.70
Deferred compensation asset	3.1	3.1
Deferred compensation obligation	2.9	3
Level 2 [Member]	'	'
Cash equivalents	90.6	312.7
Deferred compensation asset	3.1	3.1
Deferred compensation obligation	$2.90	$3

Fair_Value_Measurements_Debt_D

Fair Value Measurements (Debt) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'
Long-term debt	$240.40	'
Long-term debt, fair value	240.4	'
Convertible senior notes (Predecessor)	'	530
Convertible preferred stock (Predecessor), 85,900 shares issued	113.9	'
Convertible senior notes, fair value	'	$184.10

Pension_and_Postretirement_Hea2

Pension and Postretirement Health and Life Benefits (Narrative) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified		Defined Benefit Pension Plans [Member]	Defined Benefit Pension Plans [Member]	Pension Plan A [Member]	Pension Plan B [Member]	Pension Plan C [Member]	Pension Plan C [Member]	Postretirement Health and Life Benefits Plans [Member]	Postretirement Health and Life Benefits Plans [Member]
Expected defined benefit plan contributions for current fiscal year	'	$20.40	'	'	'	'	'	'	'
Expected defined benefit plan contributions for current fiscal year under ERISA	'	20.1	'	'	'	'	'	'	'
Expected defined benefit plan contributions for current fiscal year for non-qualified plans	'	0.3	'	'	'	'	'	'	'
USEC contributions	'	20.3	'	'	'	'	'	'	'
Defined Benefit Plan, Lump Sum Benefits Paid	'	24.7	'	'	'	'	'	'	'
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	'	'	4.87%	4.44%	4.33%	'	4.41%	4.03%	4.45%
Defined Benefit Plan, Actuarial Gain (Loss)	'	85.5	'	'	'	2.2	'	9.2	'
Fresh-Start Adjustment, Increase (Decrease), Accumulated Other Comprehensive Income (Loss)	$121.70	'	'	'	'	'	'	'	'

Pension_and_Postretirement_Hea3

Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Pension Plans [Member]	'	'	'	'
Service costs	$0.60	$1.40	$1.80	$8.80
Interest costs	10.6	11.5	31.7	33.5
Expected return on plan assets (gains)	-12.9	-12.8	-38.5	-38.3
Amortization of actuarial (gains) losses, net	0.4	2	1	14.2
Amortization of prior service costs (credits)	0	0	0	0.7
Curtailment gains	-2.2	0	-2.2	-0.7
Net benefit costs	-3.5	2.1	-6.2	18.2
Postretirement Health and Life Benefits Plans [Member]	'	'	'	'
Service costs	0.4	0.9	1.3	2.7
Interest costs	2.5	2.2	7.5	6.7
Expected return on plan assets (gains)	-0.5	-0.5	-1.5	-1.7
Amortization of actuarial (gains) losses, net	0	0.6	0	2
Amortization of prior service costs (credits)	-0.1	0	-0.3	0
Curtailment gains	0	0	0	0
Net benefit costs	$2.30	$3.20	$7	$9.70

Stockholders_Equity_Details

Stockholders' Equity (Details)	Sep. 30, 2014
Class of Stock [Line Items]	'
Preferred Stock, Shares Authorized	20,000,000
Common Stock, Shares, Issued	9,000,000
Common Class A [Member]	'
Class of Stock [Line Items]	'
Common Stock, Shares Authorized	70,000,000
Common Stock, Shares, Issued	7,563,600
Common Stock, Shares Reserved for Future Issuance Under Management Incentive Plan	1,000,000
Common Class B [Member]	'
Class of Stock [Line Items]	'
Common Stock, Shares Authorized	30,000,000
Common Stock, Shares, Issued	1,436,400

StockBased_Compensation_StockB

Stock-Based Compensation (Stock-Based Compensation Costs) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation [Abstract]	'	'	'	'
Restricted stock and restricted stock units	$0.10	$0.30	$0.60	$1.60
Stock options, performance awards and other	0	0	0	0.1
Expense included in selling, general and administrative and advanced technology costs	$0.10	$0.30	$0.60	$1.70

Income_Taxes_Details

Income Taxes (Details) (Predecessor [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Predecessor [Member]	'	'	'	'
Provision (benefit) for income taxes	($0.10)	$18.50	$1	$57.80
Unrecognized tax benefits, period increase (decrease)	'	'	$1	$0.70

Net_Income_Per_Share_Narrative

Net Income Per Share (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Debt Instrument [Line Items]	'	'	'	'
Maximum percentage of common stock shares for preferred stock conversion	19.99%	'	19.99%	'
Maximum number of common stock shares for preferred stock conversion	0.9	'	0.9	'
Convertible Debt [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Interest expense	$3	$5.10	$9	$15.20

Net_Income_Per_Share_Schedule_

Net Income Per Share (Schedule of Income Per Share) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net income (loss)	$418.90	($44.30)	$340.10	($87.20)
Net (loss) from continuing operations - if converted	418.9	-44.3	340.1	-108.9
Net income from discontinued operations - if converted	0	0	0	21.7
Net (loss) - if converted	421.9	-44.3	349.1	-87.2
Weighted average common shares	5	5	5	5
Less: Weighted average unvested restricted stock	0.1	0.1	0.1	0.1
Denominator for basic calculation	4.9	4.9	4.9	4.9
Convertible notes	1.8	1.8	1.8	1.8
Convertible preferred stock - equivalent common shares	35.8	13.7	27.2	10.5
Convertible preferred stock - less: share issuance limitation	34.9	12.8	26.3	9.6
Convertible preferred stock - net allowable shares	0.9	0.9	0.9	0.9
Subtotal	2.7	2.7	2.7	2.7
Less: shares excluded in a period of net loss or antidilution	0	2.7	0	2.7
Denominator for diluted calculation	7.6	4.9	7.6	4.9
Income (loss) from continuing operations - per basic share	$85.49	($9.04)	$69.41	($22.22)
Income (loss) from continuing operations - per diluted share	$55.51	($9.04)	$45.93	($22.22)
Income (Loss) from discontinued operations - per basic and diluted share	$0	$0	$0	$4.43
Net income (loss) per basic share	$85.49	($9.04)	$69.41	($17.79)
Net income (loss) per diluted share	$55.51	($9.04)	$45.93	($17.79)
Convertible Debt [Member]	'	'	'	'
Earnings Per Share [Abstract]	'	'	'	'
Interest expense	$3	$5.10	$9	$15.20

Net_Income_Per_Share_Net_Incom

Net Income Per Share Net Income Per Share (Schedule of Securities Excluded from Net Income Per Share) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Options excluded from diluted net income per share	200	1,000	200	1,000
Warrants excluded from diluted net income per share	250,000	250,000	250,000	250,000
Exercise price of excluded warrants	$187.50	$187.50	$187.50	$187.50
Minimum [Member]	'	'	'	'
Exercise price of excluded options	$283.25	$177.50	$283.25	$177.50
Maximum [Member]	'	'	'	'
Exercise price of excluded options	$357	$357	$357	$357

Commitment_and_Contingencies_D

Commitment and Contingencies (Details) (USD $)	6 Months Ended	9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014
ACTDO DOE Funding – Increment 1	'	$33.70
ACTDO DOE Funding – Exercised Contract Total	'	75.3
ACTDO DOE Funding – Monthly	6.9	6.7
ACTDO DOE Funding – Option	41.7	'
ACTDO DOE Funding – Total	117	'
Decontamination and Decommisioning Obligation, Noncurrent	'	22.6
Cash collateralized surety bonds	'	29.4
NYSE 30-day Average Minimum Market Capitalization	'	50
NYSE Minimum 30 Day Average Closing Price	'	$1
PBGC estimate of potential Portsmouth pension liability	'	$130

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Gain arising during period	$138.30

Segment_Information_Segment_Re

Segment Information (Segment Reporting Information) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues [Abstract]	'	'	'	'
Separative work units	$97.40	$295.80	$347.50	$853.40
Uranium	0	3.8	0	45.3
Revenue from low enriched uranium segment	97.4	299.6	347.5	898.7
Contract services	23.3	4.2	43	10.3
Total revenue	120.7	303.8	390.5	909
LEU segment gross profit	-5.9	-30.8	-21.9	-63.7
Contract services segment gross profit	0.5	0.8	-0.9	0.1
Gross profit	($5.40)	($30)	($22.80)	($63.60)

Subsequent_Event_Details

Subsequent Event (Details) (USD $)	3 Months Ended	9 Months Ended	18 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014
				Chief Executive Officer [Member]	Chief Executive Officer [Member]
Subsequent Event [Line Items]	'	'	'	'	'
Payments for Postemployment Benefits	'	'	'	'	$3.50
Officers' Compensation	'	'	'	0.2	'
Severance Costs	$0.30	$4.50	$29.70	'	$3.30