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Accounts Receivable | 12 Months Ended
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Dec. 31, 2013
Accounts Receivable, Net, Current [Abstract] |
Accounts Receivable | RECEIVABLES
| December 31,
| 2013 |  | 2012
| (millions)
Accounts Receivable: |  |  |
Utility customers | $ | 129.3 |  |  | $ | 118.3 |
DOE pro-rata share of RD&D Program funding | 20.1 |  |  | 4.4 |
Contract services, primarily DOE: |  |  |  |  |
Billed revenue | 15.7 |  |  | 12.6 |
Unbilled revenue | 1.9 |  |  | 1.6 |
Contract services, primarily DOE | 17.6 |  |  | 14.2 |
Accounts receivable, gross | 167.0 |  |  | 136.9 |
Less: valuation allowances and allowances for doubtful accounts | 4.0 |  |  | 2.1 |
Accounts receivable, net | $ | 163.0 |  |  | $ | 134.8 |
DOE Receivables included in Other Long-Term Assets: |  |  |
DOE long-term receivables, gross | $ | 80.8 |  |  | $ | 38.0 |
Less: valuation allowances and allowances for doubtful accounts | $ | 55.0 |  |  | 12.2 |
DOE long-term receivables, net | $ | 25.8 |  |  | $ | 25.8 |
Additional details regarding DOE’s pro-rata share of funding for American Centrifuge expenditures under the RD&D Program are provided in Note 5. 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. Unbilled amounts are invoiced to DOE as billing rates are revised, submitted to and approved by DOE. Certain receivables from DOE are included in other long-term assets based on the extended timeframe expected to resolve claims for payment. USEC believes DOE has breached its agreements by failing to establish appropriate provisional billing and final indirect cost rates on a timely basis and USEC has filed claims with DOE for payment under the Contract Disputes Act ("CDA"). DOE denied USEC's initial claim for payment of $38.0 million, and on May 30, 2013, USEC appealed the DOE's denial of its claims to the U.S. Court of Federal Claims. On August 30, 2013, USEC submitted an additional claim to DOE under the CDA for payment of $42.8 million, representing DOE's share of pension and postretirement benefits costs related to the transition of Portsmouth site employees to DOE's D&D contractor. As noted in Note 20, USEC has potential pension plan funding obligations under Section 4062(e) of the Employee Retirement Income Security Act (“ERISA”) related to USEC's de-lease of the Portsmouth gaseous diffusion facilities and transition of employees to DOE's D&D contractor and related to the transition of employees in connection with the Paducah GDP transition. USEC believes that DOE is responsible for a significant portion of any pension and postretirement benefit costs associated with the transition of employees at Portsmouth. The receivable for DOE's share of pension and postretirement benefits costs has a full valuation allowance due to the lack of a resolution with DOE and uncertainty regarding the amounts owed and the timing of collection. The amounts owed by DOE may be more than the amounts invoiced by USEC to date. USEC has unapplied payments from DOE included in other long-term liabilities pending resolution of the long-term receivables from DOE described above. DOE funded a portion of USEC's contract services work through an arrangement whereby DOE transferred uranium to USEC which USEC immediately sold. USEC completed six competitive sales of uranium between the fourth quarter of 2009 and the first quarter of 2011. The net cash proceeds from the uranium sales are to be applied, at the direction of DOE, (a) as revenue is recognized in USEC’s contract services segment as services are provided or (b) to existing receivables balances due from DOE in USEC’s contract services segment. The remaining payment balance included in other long-term liabilities is $19.7 million as of December 31, 2013 and $20.5 million as of December 31, 2012.

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