XML 76 R94.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Commitment and Contingencies (Details) (USD $) | 12 Months Ended | 22 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Apr. 14, 2014
Amount of application under DOE Loan Guarantee Program | $ 2,000,000,000 |  |  |
RD&D Program Funding - Jan 2014 appropriations |  |  |  | 62,000,000
RD&D Program Funding by DOE Increments 5-6 |  |  |  | 29,300,000
RD&D Program Funding by DOE Increment 7 |  |  |  | 22,600,000
RD&D Program Funding - DOE Transfer Authority |  |  |  | 56,650,000
Minimum Paducah SWU Production Under 2002 DOE-USEC Agreement | 3,500,000 |  |  |
NYSE Minimum 30 Day Average Closing Price | $ 1.00 |  |  |
NYSE 30-day average minimum market capitalization | 50,000,000 |  |  |
NYSE 30-Day Market Capitalization Subject to Suspension | 15,000,000 |  |  |
PBGC estimate of potential Portsmouth pension liability | 130,000,000 |  |  |
Operating Leases, Rent Expense | 7,100,000 | 7,300,000 | 8,500,000 |
Minimum [Member] |  |  |  |
ACP Sales Royalty Rate | 1.00% |  |  |
ACP Sales Royalty | 100,000 |  |  |
Maximum [Member] |  |  |  |
ACP Sales Royalty Rate | 2.00% |  |  |
ACP Sales Royalty | $ 100,000,000 |  |  |

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition American Centrifuge Plant (ACP) Sales Royalty + References No definition available. + Details
Name: | usu_ACPSalesRoyalty
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition American Centrifuge Plant (ACP) Sales Royalty Rate + References No definition available. + Details
Name: | usu_ACPSalesRoyaltyRate
Namespace Prefix: | usu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of application under DOE Loan Guarantee Program + References No definition available. + Details
Name: | usu_AmountOfApplicationUnderDoeLoanGuaranteeProgram
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Paducah SWU Production Under 2002 DOE-USEC Agreement + References No definition available. + Details
Name: | usu_MinimumPaducahSWUProductionUnder2002DOEUSECAgreement
Namespace Prefix: | usu_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition NYSE 30-day average minimum market capitalization + References No definition available. + Details
Name: | usu_Nyse30DayAverageMinimumMarketCapitalization
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition NYSE 30-Day Market Capitalization Subject to Immediate Suspension and Delisting + References No definition available. + Details
Name: | usu_NYSE30DayMarketCapitalizationSubjecttoSuspension
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition NYSE Minimum 30 Day Average Closing Price + References No definition available. + Details
Name: | usu_NYSEMinimum30DayAverageClosingPrice
Namespace Prefix: | usu_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition PBGC estimate of potential Portsmouth pension liability + References No definition available. + Details
Name: | usu_PbgcEstimateOfPotentialPortsmouthPensionLiability
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition RD&D Program Funding by DOE Increment 7 + References No definition available. + Details
Name: | usu_RDDProgramFundingbyDOEIncrement7
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition RD&D Program Funding by DOE Increments 5-6 + References No definition available. + Details
Name: | usu_RDDProgramFundingbyDOEIncrements56
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition RD&D Program Funding - DOE Transfer Authority + References No definition available. + Details
Name: | usu_RDDProgramFundingDOETransferAuthority
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition RD&D Program Funding - Jan 2014 appropriations + References No definition available. + Details
Name: | usu_RDDProgramFundingJan2014appropriations
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration