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Accounts Receivable (Table) (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Accounts Receivable |  |
Utility Trade Receivables | $ 39.1 | $ 249.1
Uranium Loaned To Customers | 41.2 |
Utility Unbilled Revenue | 0.3 | 0.4
Utility Customer Receivables | 80.6 | 249.5
Contract Services Billed Revenue | 17.8 | 34.8
Contract Services Unbilled Revenue | 35.6 | 24.3
Contract Services Customer Receivables | 53.4 | 59.1
Accounts Receivable, Net | $ 134.0 | $ 308.6

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract Services Billed Revenue + Details
Name: | usu_ContractServicesBilledRevenue
Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract Services Customer Receivables + Details
Name: | usu_ContractServicesCustomerReceivables
Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract Services Unbilled Revenue + Details
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Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Uranium Loaned To Customers + Details
Name: | usu_UraniumLoanedToCustomers
Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Utility Customer Receivables + Details
Name: | usu_UtilityCustomerReceivables
Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Trade receivables from utility customers + Details
Name: | usu_UtilityTradeReceivables
Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Utility Unbilled Revenue + Details
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Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant