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Accounts Receivable
 6 Months Ended
Jun. 30, 2014
Accounts Receivable, Net, Current [Abstract]  
Accounts Receivable
RECEIVABLES
 
June 30,
2014
 
December 31, 2013
 
(millions)
Accounts Receivable:
 
 
 
Utility customers and other
$
7.8

 
$
129.3

DOE cost share of Cooperative Agreement funding
0.4

 
20.1

Contract services, primarily DOE:
 
 
 

Billed revenue
16.5

 
15.7

Unbilled revenue
18.5

 
1.9

Contract services, primarily DOE
35.0

 
17.6

Accounts receivable, gross
43.2

 
167.0

Less: valuation allowances and allowances for doubtful accounts
13.5

 
4.0

Accounts receivable, net
$
29.7

 
$
163.0

 
 
 
 
DOE Receivables included in Other Long-Term Assets:
 
 
 
DOE long-term receivables, gross
$
76.5

 
$
80.8

Less: valuation allowances and allowances for doubtful accounts
55.3

 
55.0

DOE long-term receivables, net
$
21.2

 
$
25.8


 

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 for the periods through 2011, and on May 30, 2013, USEC appealed DOE's denial of its claims to the U.S. Court of Federal Claims. During the second quarter of 2014, DOE paid approximately $4.7 million related to these claims. In July 2014, DOE paid an additional $1.4 million.

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 decontamination and decommissioning ("D&D") contractor. As noted in Note 16, 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 $19.6 million as of June 30, 2014 and $19.7 million as of December 31, 2013.