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Debt (Schedule of Deferred Financing Costs) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Bank credit facilities [Member] |
Deferred Finance Costs, Beginning Balance | $ 3.0
Deferred financing costs, additions | 2.0
Deferred financing costs, reductions | (3.2)
Deferred Finance Costs, End Balance | 1.8
Convertible notes [Member] |
Deferred Finance Costs, Beginning Balance | 3.6
Deferred financing costs, reductions | (0.5)
Deferred Finance Costs, End Balance | $ 3.1

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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred financing costs, additions + References No definition available. + Details
Name: | usu_DeferredFinancingCostsAdditions
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred financing costs, amortization + References No definition available. + Details
Name: | usu_DeferredFinancingCostsAmortization
Namespace Prefix: | usu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration