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Accounts Receivable | 6 Months Ended
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Jun. 30, 2013
Accounts Receivable, Net, Current [Abstract] |
Accounts Receivable | ACCOUNTS RECEIVABLE
| June 30, 2013 |  | December 31, 2012
| (millions)
Utility customers | $ | 105.2 |  |  | $ | 118.3 |
DOE pro-rata share of RD&D program funding | 24.2 |  |  | 4.4 |
Contract services, primarily DOE: |  |  |  |  |
Billed revenue | 9.3 |  |  | 10.5 |
Unbilled revenue | 2.2 |  |  | 1.6 |
| 11.5 |  |  | 12.1 |
| $ | 140.9 |  |  | $ | 134.8 |
Additional details regarding DOE’s pro-rata share of funding for American Centrifuge expenditures under the RD&D program are provided in Note 4. Billings for contract services related to DOE are generally invoiced based on provisional billing rates approved by DOE. Unbilled revenue represents the difference between actual costs incurred, prior to incurred cost audit and notice by DOE authorizing final billing, and provisional billing rate invoiced amounts. USEC expects to invoice and collect the unbilled amounts as billing rates are revised, submitted to and approved by DOE. Current accounts receivable are net of valuation allowances and allowances for doubtful accounts totaling $2.5 million at June 30, 2013 and $2.1 million at December 31, 2012. Certain receivables from DOE of $38.0 million, net of valuation allowances of $12.2 million, are included in other long-term assets as of June 30, 2013 and December 31, 2012 based on the extended timeframe expected to resolve claims for payment filed by USEC under the Contract Disputes Act. On May 30, 2013, USEC appealed the DOE's denial of its claims to the U.S. Court of Federal Claims. USEC believes DOE has breached its agreements by failing to establish appropriate provisional billing and final indirect cost rates on a timely basis.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph d -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5162-111524 + Details
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