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v2.3.0.11

Fair Value Measurements (Reconciliation of Fair Value Using Significant Unobservable Inputs ) (Details) (Convertible Preferred Stock [Member], USD $) In Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011
Convertible Preferred Stock [Member] |  |
Beginning balance | $ 80.7 | $ 78.2
Less: paid-in-kind dividends payable, beginning balance | (2.5) | (2.4)
Issuances | 2.5 | 4.9
Paid-in-kind dividends payable | 2.6 | 2.6
Ending balance | $ 83.3 | $ 83.3

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- Definition Issues that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Paid in kind convertible preferred stock dividends payable + Details
Name: | usu_PaidInKindDividendsPayable
Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Paid in kind convertible preferred stock dividends payable beginning balance + Details
Name: | usu_PaidInKindDividendsPayableBeginningBalance
Namespace Prefix: | usu
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration