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Debt (Schedule of Deferred Financing Costs) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Bank credit facilities [Member] |
Deferred Finance Costs, Beginning Balance | $ 3.0
Deferred financing costs, additions | 2.1
Deferred financing costs, reductions | (5.1)
Deferred Finance Costs, End Balance | 0
Convertible notes [Member] |
Deferred Finance Costs, Beginning Balance | 3.6
Deferred financing costs, reductions | (1.5)
Deferred Finance Costs, End Balance | $ 2.1

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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 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + 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