Summary of Significant Accounting Policies (Notes)	12 Months Ended
Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Cash and Cash Equivalents Cash and cash equivalents include temporary cash investments with original maturities of three months or less. Inventories and Inventories Owed to Customers and Suppliers 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 ceased uranium enrichment at the Paducah gaseous diffusion plant (the "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. Included in cost of sales are certain inventory charges related to the Paducah GDP transition that are categorized as non-production expenses, as detailed in Note 6, Transition Charges. SWU and uranium inventory costs are determined using the monthly moving average cost method. SWU costs for the Successor Company are based on Russian SWU purchase costs and the inventory cost basis as of the Effective Date. SWU inventory costs were increased by $35.4 million as of the Effective Date to reflect fresh start accounting adjustments as described in Note 4, Fresh Start Accounting. Centrus acquires Russian LEU under the terms of a 10-year commercial agreement with Russia (the "Russian Supply Agreement"). Deliveries under the supply agreement are expected to continue through 2022. The cost of the SWU component of LEU acquired from Russia is recorded at the purchase cost plus related shipping costs. Inventories of SWU and uranium are valued at the lower of cost or market. Market is based on the terms of long-term contracts with customers, and, for uranium not under contract, market is based primarily on published price indicators at the balance sheet date. Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators. Fabricators process LEU into fuel for use in nuclear reactors. Under inventory optimization arrangements between Centrus and domestic fabricators, fabricators order quantities of LEU from Centrus based on scheduled or anticipated orders from utility customers for deliveries in future periods. As delivery obligations under actual customer orders arise, Centrus satisfies these obligations by arranging for the transfer to the customer of title to the specified quantity of LEU at the fabricator. Centrus’ balances of SWU and uranium vary over time based on the timing and size of the fabricator’s LEU orders from Centrus and the fabricator's needs for working stock of LEU. Balances can be positive or negative at the discretion of the fabricator. Fabricators have other inventory supplies and, where a fabricator has elected to order less material from Centrus than Centrus is required to deliver to its customers at the fabricator, the fabricator will use these other inventories to satisfy Centrus’ customer order obligations on Centrus' behalf. In such cases, the transfer of title of LEU from Centrus to the customer results in quantities of SWU and uranium owed by Centrus to the fabricator. The amounts of SWU and uranium owed to fabricators are satisfied as future deliveries of LEU to fabricators are made. Deferred Taxes Centrus follows the asset and liability approach to account for deferred taxes. Deferred tax assets and liabilities are recognized for the anticipated future tax consequences of temporary differences between the balance sheet carrying amounts of assets and liabilities and their respective tax bases. Deferred taxes are based on income tax rates in effect for the years in which temporary differences are expected to reverse. The effect on deferred taxes of a change in income tax rates is recognized in income when the change in rates is enacted in the law. A valuation allowance is provided if it is more likely than not that some or all of the deferred tax assets may not be realized. Property, Plant and Equipment Leasehold improvements and machinery and equipment are recorded at acquisition cost and depreciated on a straight line basis over the useful life of the assets. Advanced Technology Costs Historically, costs relating to the development and deployment of the American Centrifuge technology were either charged to expense or capitalized based on the nature of the activities and estimates and judgments involving the completion of project milestones. Costs relating to the demonstration of American Centrifuge technology were charged to expense as incurred and costs relating to the construction and deployment of the American Centrifuge Plant ("ACP") were capitalized. Beginning with the fourth quarter of 2011, all project costs incurred have been expensed, including interest expense that previously would have been capitalized. As of December 31, 2012, the Company expensed $1.1 billion of previously capitalized costs related to the American Centrifuge project. Although the Company continued to make progress in the deployment of the ACP, the expense of previously capitalized costs was based on its assessment of its ability to recover the full amount of this prior capital investment. This expense of previously capitalized costs does not affect any future capital investment in the ACP. The Company would anticipate that capitalization of amounts related to the ACP would resume if and when commercial plant deployment resumes. Refer to Note 7, Advanced Technology Costs and Other Income, and Note 20, Commitments and Contingencies, for further details regarding the American Centrifuge project. Intangible Assets Centrus has amortizable and nonamortizable intangible assets resulting from fresh start accounting as a result of emergence from Chapter 11 bankruptcy. Centrus will evaluate the carrying value of the intangible assets by performing impairment tests whenever adverse conditions or changes in circumstances indicate a possible impairment loss. The amortizable intangible assets relate to backlog and customer relationships. The backlog intangible asset is amortized as backlog is reduced, principally as result of deliveries to customers. The customer relationships intangible asset is amortized using the straight-line method over the estimated average useful life of 15 years. Centrus evaluates the carrying value of the nonamortizable excess reorganization value by performing an impairment test on an annual basis as of November 30 or whenever events or changes in circumstances indicate that its carrying amount may not be recoverable. The excess reorganization value testing utilizes a two-step process, where the carrying value of the reporting unit is compared to its fair value. If the carrying value is less than the fair value, no impairment exists and the second step is not performed. However, if the carrying value is greater than the fair value, the second step is performed. An impairment charge would be recognized for the amount that the carrying value of the excess reorganization value exceeds its fair value. The fair value of the reporting unit is estimated using the net present value of projected future cash flows. Centrus performed a qualitative assessment in the fourth quarter of 2014. The qualitative assessment determines whether it is “more likely than not” (that is, likelihood of more than 50 percent) that the fair value of a reporting unit is less than its carrying amount, including goodwill. If we determine that it is not “more likely than not” that the fair value of a reporting unit is less than its carrying amount, then the first and second step of the goodwill impairment test (quantitative assessment) are not necessary. The qualitative assessment results did not require Centrus to perform a quantitative assessment for 2014. Financial Instruments and Fair Value Measurement Accounting standards define fair value 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. Pursuant to accounting standards, Centrus’ paid-in-kind toggle notes are recorded at face value and the fair value is disclosed. The estimated fair value of the paid-in-kind toggle notes is based on the trading price at the balance sheet date. Financing costs are deferred and amortized over the life of the instrument. The balance sheet carrying amounts for cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, and payables under SWU purchase agreements approximate fair value because of the short-term nature of the instruments. Concentrations of Credit Risk Credit risk could result from the possibility of a customer failing to perform or pay according to the terms of a contract. Extension of credit is based on an evaluation of each customer's financial condition. Centrus regularly monitors credit risk exposure and takes steps to mitigate the likelihood of such exposure resulting in a loss. SWU and Uranium Revenue Revenue is derived from sales of the SWU component of LEU, from sales of both the SWU and uranium components of LEU, and from sales of uranium. Revenue is recognized at the time LEU or uranium is delivered under the terms of contracts with domestic and international electric utility customers. Most customers take title and delivery of LEU at fuel fabricators. Centrus ships LEU to nuclear fuel fabricators for scheduled or anticipated orders from utility customers. Based on customer orders, Centrus arranges for the transfer of title of LEU from Centrus to the customer for the specified quantity of LEU at the fuel fabricator. Revenue is recognized when delivery of LEU to the customer occurs at the fuel fabricator. In a number of sales transactions, title to uranium or LEU is transferred to the customer and Centrus receives payment under normal credit terms without physically delivering the uranium or LEU to the customer. This may occur because the terms of the agreement require Centrus to hold the uranium to which the customer has title, or because the customer encounters brief delays in taking delivery of LEU from Centrus. In such cases, recognition of revenue and related cost of sales does not occur at the time title to uranium or LEU transfers to the customer but instead are deferred until LEU to which the customer has title is physically delivered. Contract Services Revenue Beginning in May 2014, the contract services segment includes revenue and cost of sales for American Centrifuge work Centrus performs under 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 ACTDO Agreement is a firm, fixed-price contract and project spending levels are consistent with the fixed funding levels. Centrus records an unbilled receivable and revenue based on the progress towards the achievement of monthly deliverables. Monthly reports and invoices affirming the achievement of monthly deliverables are submitted shortly following each month. The achievement of monthly deliverables has resulted in revenue consistent with the monthly funding levels. The contract services segment also includes limited services provided by Centrus to the U.S. Department of Energy ("DOE") and its contractors at the Portsmouth site related to facilities we continue to lease for the American Centrifuge Plant and formerly at the Paducah GDP. Contract services revenue includes billings for fees and reimbursements for allowable costs that are determined in accordance with the terms of the underlying contracts. Revenue is recognized as work is performed and as fees are earned. Allowable costs include direct costs as well as allocations of indirect plant and corporate overhead costs determined in accordance with government cost accounting standards. Amounts representing contract change orders or final billing rates based on incurred costs are accrued and included in revenue when they can be reliably estimated and realization is probable. Allowable costs are subject to audit by the Defense Contract Audit Agency ("DCAA"), or such other entity that DOE authorizes to conduct the audit. The final settlement of amounts submitted by Centrus for reimbursement is subject to Federal Acquisition Regulations requiring the DOE contracting officer to conduct negotiations and prepare a written indirect cost agreement. Revenue resulting from final billing rates is recognized upon completion of the government audits and notice by DOE authorizing final billing. DOE historically has not approved Centrus’ provisional billing rates and has not completed audits of Centrus' incurred cost submissions and authorized final payments in a timely manner. Additional details are provided in Note 8. There is the potential for additional revenue to be recognized, based on the outcome of DOE reviews and audits, as the result of the release of previously established receivable related reserves. However, because these periods have not been finalized with DOE, uncertainty exists and Centrus has not yet recognized this additional revenue. Pension and Postretirement Health and Life Benefit Plans The Company provides retirement benefits to certain employees and retirees under defined benefit pension plans and postretirement health and life benefit plans. The valuation of benefit obligations and costs is based on provisions of the plans and actuarial assumptions that involve judgments and estimates. Plan assets and benefit obligations are remeasured each year as of the balance sheet date resulting in differences between actual and projected results for the year. Historically, the Company recognized these actuarial gains and losses as a component of stockholders’ equity 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. Upon the adoption of fresh start accounting and as a result of ceasing enrichment activities and the various plan changes described below, the Successor Company adopted an accounting policy to immediately recognize actuarial gains and losses in the statement of operations beginning in the fourth quarter of 2014. 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. Stock-Based Compensation Centrus has a stock-based compensation plan which authorizes the issuance of 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. 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. Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect reported amounts presented and disclosed in the consolidated financial statements. Significant estimates and judgments include, but are not limited to, asset valuations, American Centrifuge decontamination and decommissioning obligations, pension and postretirement health and life benefit costs and obligations, the tax bases of assets and liabilities, the future recoverability of deferred tax assets, and determination of the valuation allowance for deferred tax assets. Actual results may differ from such estimates, and estimates may change if the underlying conditions or assumptions change. 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' consolidated financial statements. 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 requiring management to assess an entity’s ability to continue as a going concern, and to provide related disclosures in certain circumstances. The new standard is effective for annual periods beginning after December 15, 2016, and for annual and interim periods thereafter. Early adoption is permitted. The implementation of the new standard is not expected to have a material impact on Centrus' consolidated financial statements.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Cash and Cash Equivalents

Cash and cash equivalents include temporary cash investments with original maturities of three months or less.

Inventories and Inventories Owed to Customers and Suppliers

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 ceased uranium enrichment at the Paducah gaseous diffusion plant (the "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. Included in cost of sales are certain inventory charges related to the Paducah GDP transition that are categorized as non-production expenses, as detailed in Note 6, Transition Charges.

SWU and uranium inventory costs are determined using the monthly moving average cost method. SWU costs for the Successor Company are based on Russian SWU purchase costs and the inventory cost basis as of the Effective Date. SWU inventory costs were increased by $35.4 million as of the Effective Date to reflect fresh start accounting adjustments as described in Note 4, Fresh Start Accounting.

Centrus acquires Russian LEU under the terms of a 10-year commercial agreement with Russia (the "Russian Supply Agreement"). Deliveries under the supply agreement are expected to continue through 2022. The cost of the SWU component of LEU acquired from Russia is recorded at the purchase cost plus related shipping costs.

Inventories of SWU and uranium are valued at the lower of cost or market. Market is based on the terms of long-term contracts with customers, and, for uranium not under contract, market is based primarily on published price indicators at the balance sheet date.

Inventories owed to customers and suppliers, included in current liabilities, consist primarily of SWU and uranium inventories owed to fabricators. Fabricators process LEU into fuel for use in nuclear reactors. Under inventory optimization arrangements between Centrus and domestic fabricators, fabricators order quantities of LEU from Centrus based on scheduled or anticipated orders from utility customers for deliveries in future periods. As delivery obligations under actual customer orders arise, Centrus satisfies these obligations by arranging for the transfer to the customer of title to the specified quantity of LEU at the fabricator. Centrus’ balances of SWU and uranium vary over time based on the timing and size of the fabricator’s LEU orders from Centrus and the fabricator's needs for working stock of LEU. Balances can be positive or negative at the discretion of the fabricator. Fabricators have other inventory supplies and, where a fabricator has elected to order less material from Centrus than Centrus is required to deliver to its customers at the fabricator, the fabricator will use these other inventories to satisfy Centrus’ customer order obligations on Centrus' behalf. In such cases, the transfer of title of LEU from Centrus to the customer results in quantities of SWU and uranium owed by Centrus to the fabricator. The amounts of SWU and uranium owed to fabricators are satisfied as future deliveries of LEU to fabricators are made.

Deferred Taxes

Centrus follows the asset and liability approach to account for deferred taxes. Deferred tax assets and liabilities are recognized for the anticipated future tax consequences of temporary differences between the balance sheet carrying amounts of assets and liabilities and their respective tax bases. Deferred taxes are based on income tax rates in effect for the years in which temporary differences are expected to reverse. The effect on deferred taxes of a change in income tax rates is recognized in income when the change in rates is enacted in the law. A valuation allowance is provided if it is more likely than not that some or all of the deferred tax assets may not be realized.

Property, Plant and Equipment

Leasehold improvements and machinery and equipment are recorded at acquisition cost and depreciated on a straight line basis over the useful life of the assets.

Advanced Technology Costs

Historically, costs relating to the development and deployment of the American Centrifuge technology were either charged to expense or capitalized based on the nature of the activities and estimates and judgments involving the completion of project milestones. Costs relating to the demonstration of American Centrifuge technology were charged to expense as incurred and costs relating to the construction and deployment of the American Centrifuge Plant ("ACP") were capitalized.

Beginning with the fourth quarter of 2011, all project costs incurred have been expensed, including interest expense that previously would have been capitalized. As of December 31, 2012, the Company expensed $1.1 billion of previously capitalized costs related to the American Centrifuge project. Although the Company continued to make progress in the deployment of the ACP, the expense of previously capitalized costs was based on its assessment of its ability to recover the full amount of this prior capital investment. This expense of previously capitalized costs does not affect any future capital investment in the ACP. The Company would anticipate that capitalization of amounts related to the ACP would resume if and when commercial plant deployment resumes.

Refer to Note 7, Advanced Technology Costs and Other Income, and Note 20, Commitments and Contingencies, for further details regarding the American Centrifuge project.

Intangible Assets

Centrus has amortizable and nonamortizable intangible assets resulting from fresh start accounting as a result of emergence from Chapter 11 bankruptcy. Centrus will evaluate the carrying value of the intangible assets by performing impairment tests whenever adverse conditions or changes in circumstances indicate a possible impairment loss.

The amortizable intangible assets relate to backlog and customer relationships. The backlog intangible asset is amortized as backlog is reduced, principally as result of deliveries to customers. The customer relationships intangible asset is amortized using the straight-line method over the estimated average useful life of 15 years.

Centrus evaluates the carrying value of the nonamortizable excess reorganization value by performing an impairment test on an annual basis as of November 30 or whenever events or changes in circumstances indicate that its carrying amount may not be recoverable. The excess reorganization value testing utilizes a two-step process, where the carrying value of the reporting unit is compared to its fair value. If the carrying value is less than the fair value, no impairment exists and the second step is not performed. However, if the carrying value is greater than the fair value, the second step is performed. An impairment charge would be recognized for the amount that the carrying value of the excess reorganization value exceeds its fair value. The fair value of the reporting unit is estimated using the net present value of projected future cash flows.

Centrus performed a qualitative assessment in the fourth quarter of 2014. The qualitative assessment determines whether it is “more likely than not” (that is, likelihood of more than 50 percent) that the fair value of a reporting unit is less than its carrying amount, including goodwill. If we determine that it is not “more likely than not” that the fair value of a reporting unit is less than its carrying amount, then the first and second step of the goodwill impairment test (quantitative assessment) are not necessary. The qualitative assessment results did not require Centrus to perform a quantitative assessment for 2014.

Financial Instruments and Fair Value Measurement

Accounting standards define fair value 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.

Pursuant to accounting standards, Centrus’ paid-in-kind toggle notes are recorded at face value and the fair value is disclosed. The estimated fair value of the paid-in-kind toggle notes is based on the trading price at the balance sheet date. Financing costs are deferred and amortized over the life of the instrument.

The balance sheet carrying amounts for cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, and payables under SWU purchase agreements approximate fair value because of the short-term nature of the instruments.

Concentrations of Credit Risk

Credit risk could result from the possibility of a customer failing to perform or pay according to the terms of a contract. Extension of credit is based on an evaluation of each customer's financial condition. Centrus regularly monitors credit risk exposure and takes steps to mitigate the likelihood of such exposure resulting in a loss.

SWU and Uranium Revenue

Revenue is derived from sales of the SWU component of LEU, from sales of both the SWU and uranium components of LEU, and from sales of uranium. Revenue is recognized at the time LEU or uranium is delivered under the terms of contracts with domestic and international electric utility customers. Most customers take title and delivery of LEU at fuel fabricators. Centrus ships LEU to nuclear fuel fabricators for scheduled or anticipated orders from utility customers. Based on customer orders, Centrus arranges for the transfer of title of LEU from Centrus to the customer for the specified quantity of LEU at the fuel fabricator. Revenue is recognized when delivery of LEU to the customer occurs at the fuel fabricator.

In a number of sales transactions, title to uranium or LEU is transferred to the customer and Centrus receives payment under normal credit terms without physically delivering the uranium or LEU to the customer. This may occur because the terms of the agreement require Centrus to hold the uranium to which the customer has title, or because the customer encounters brief delays in taking delivery of LEU from Centrus. In such cases, recognition of revenue and related cost of sales does not occur at the time title to uranium or LEU transfers to the customer but instead are deferred until LEU to which the customer has title is physically delivered.

Contract Services Revenue

Beginning in May 2014, the contract services segment includes revenue and cost of sales for American Centrifuge work Centrus performs under 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 ACTDO Agreement is a firm, fixed-price contract and project spending levels are consistent with the fixed funding levels. Centrus records an unbilled receivable and revenue based on the progress towards the achievement of monthly deliverables. Monthly reports and invoices affirming the achievement of monthly deliverables are submitted shortly following each month. The achievement of monthly deliverables has resulted in revenue consistent with the monthly funding levels.

The contract services segment also includes limited services provided by Centrus to the U.S. Department of Energy ("DOE") and its contractors at the Portsmouth site related to facilities we continue to lease for the American Centrifuge Plant and formerly at the Paducah GDP. Contract services revenue includes billings for fees and reimbursements for allowable costs that are determined in accordance with the terms of the underlying contracts. Revenue is recognized as work is performed and as fees are earned. Allowable costs include direct costs as well as allocations of indirect plant and corporate overhead costs determined in accordance with government cost accounting standards. Amounts representing contract change orders or final billing rates based on incurred costs are accrued and included in revenue when they can be reliably estimated and realization is probable. Allowable costs are subject to audit by the Defense Contract Audit Agency ("DCAA"), or such other entity that DOE authorizes to conduct the audit. The final settlement of amounts submitted by Centrus for reimbursement is subject to Federal Acquisition Regulations requiring the DOE contracting officer to conduct negotiations and prepare a written indirect cost agreement. Revenue resulting from final billing rates is recognized upon completion of the government audits and notice by DOE authorizing final billing. DOE historically has not approved Centrus’ provisional billing rates and has not completed audits of Centrus' incurred cost submissions and authorized final payments in a timely manner. Additional details are provided in Note 8. There is the potential for additional revenue to be recognized, based on the outcome of DOE reviews and audits, as the result of the release of previously established receivable related reserves. However, because these periods have not been finalized with DOE, uncertainty exists and Centrus has not yet recognized this additional revenue.

Pension and Postretirement Health and Life Benefit Plans

The Company provides retirement benefits to certain employees and retirees under defined benefit pension plans and postretirement health and life benefit plans. The valuation of benefit obligations and costs is based on provisions of the plans and actuarial assumptions that involve judgments and estimates. Plan assets and benefit obligations are remeasured each year as of the balance sheet date resulting in differences between actual and projected results for the year. Historically, the Company recognized these actuarial gains and losses as a component of stockholders’ equity 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. Upon the adoption of fresh start accounting and as a result of ceasing enrichment activities and the various plan changes described below, the Successor Company adopted an accounting policy to immediately recognize actuarial gains and losses in the statement of operations beginning in the fourth quarter of 2014. 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.

Stock-Based Compensation

Centrus has a stock-based compensation plan which authorizes the issuance of 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. 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.

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect reported amounts presented and disclosed in the consolidated financial statements. Significant estimates and judgments include, but are not limited to, asset valuations, American Centrifuge decontamination and decommissioning obligations, pension and postretirement health and life benefit costs and obligations, the tax bases of assets and liabilities, the future recoverability of deferred tax assets, and determination of the valuation allowance for deferred tax assets. Actual results may differ from such estimates, and estimates may change if the underlying conditions or assumptions change.

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' consolidated financial statements.

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 requiring management to assess an entity’s ability to continue as a going concern, and to provide related disclosures in certain circumstances. The new standard is effective for annual periods beginning after December 15, 2016, and for annual and interim periods thereafter. Early adoption is permitted. The implementation of the new standard is not expected to have a material impact on Centrus' consolidated financial statements.