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Revenue and Contracts with Customers
 6 Months Ended
Jun. 30, 2022
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer REVENUE AND CONTRACTS WITH CUSTOMERS
Disaggregation of Revenue

The following table presents revenue from separative work units (“SWU”) and uranium sales disaggregated by geographical region based on the billing addresses of customers (in millions):

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
United States$7.3 $45.2 $19.9 $54.8 
Foreign 78.2 — 83.3 28.5
Revenue - SWU and uranium$85.5 $45.2 $103.2 $83.3 

Refer to Note 12, Segment Information, for disaggregation of revenue by segment. SWU sales are made primarily to electric utility customers and uranium sales are made primarily to other nuclear fuel related companies. Technical solutions revenue resulted primarily from services provided to the government and its contractors. SWU
and uranium revenue is recognized at point of sale and technical solutions revenue is generally recognized over time.

Accounts Receivable
June 30, 2022December 31, 2021
($ millions)
Accounts receivable:
Billed$20.6 $23.1 
Unbilled *3.4 6.0 
Accounts receivable$24.0 $29.1 
* Billings under certain contracts in the technical services segment are invoiced based on approved provisional billing rates. Unbilled revenue represents the difference between actual costs incurred and invoiced amounts. The Company expects to invoice and collect the unbilled amounts after actual rates are submitted to the customer and approved. Unbilled revenue also includes unconditional rights to payment that are not yet billable under applicable contracts pending the compilation of supporting documentation.

Contract Liabilities

The following table presents changes in contract liability balances (in millions):
June 30, 2022December 31, 2021Year-To-Date Change
Accrued loss on HALEU Contract:
Current - Accounts payable and accrued liabilities
$— $0.5 $(0.5)
Deferred revenue - current$249.5 $288.1 $(38.6)
Advances from customers - current$15.3 $15.0 $0.3 
Advances from customers - noncurrent$46.2 $45.1 $1.1 

Previously deferred sales recognized in revenue totaled $59.7 million and $28.5 million in the six months ended June 30, 2022 and 2021, respectively.

LEU Segment

The SWU component of low-enriched uranium (“LEU”) typically is bought and sold under contracts with deliveries over several years. The Company’s agreements for natural uranium sales generally are shorter-term, fixed-commitment contracts. The Company’s order book of sales under contract in the LEU segment (“order book”) extends to 2029. As of June 30, 2022, the order book was approximately $1.0 billion. The order book represents the estimated aggregate dollar amount of revenue for future SWU and uranium deliveries under contract and includes approximately $311.0 million of Deferred Revenue and Advances from Customers. As of December 31, 2021, the order book was also approximately $1.0 billion.

Most of the Company’s customer contracts provide for fixed purchases of SWU during a given year. The Company’s order book is partially based on customers’ estimates of the timing and size of their fuel requirements and other assumptions that are subject to change. For example, depending on the terms of specific contracts, the customer may be able to increase or decrease the quantity delivered within an agreed range. The Company’s order book estimate also is based on the Company’s estimates of selling prices, which may be subject to change. For example, depending on the terms of specific contracts, prices may be adjusted based on escalation using a general inflation index, published SWU price indicators prevailing at the time of delivery, and other factors, all of which are variable. The Company uses external composite forecasts of future market prices and inflation rates in its pricing estimates.
Technical Solutions Segment

Revenue for the technical solutions segment, representing the Company’s technical, manufacturing, engineering, procurement, construction, and operations services offered to public and private sector customers, is recognized over the contractual period as services are rendered.

On October 31, 2019, the Company signed a cost-share contract with the U.S. Department of Energy (“DOE”) (the “HALEU Contract”) to deploy a cascade of centrifuges to demonstrate production of high-assay, low-enriched uranium (“HALEU”) for advanced reactors. HALEU is a component of an advanced nuclear reactor fuel that is not commercially available today and may be required for a number of advanced reactor and fuel designs currently under development in both the commercial and government sectors. The program has been under way since May 31, 2019, when the Company and DOE signed a preliminary letter agreement that allowed work to begin while the full contract was being finalized.

In 2019, under the HALEU Contract, DOE agreed to reimburse the Company for 80% of its costs incurred in performing the contract. The DOE has modified the contract several times to increase the total contract funding to $147.0 million as of June 30, 2022. Subsequent to June 30, 2022, additional modifications increased the total contract funding to $154.0 million. In April 2022, the DOE modified the HALEU Contract to extend the period of performance to November 30, 2022 with authorization to work through August 31, 2022. Costs under the HALEU Contract include program costs, including direct labor and materials and associated indirect costs that are classified as Cost of Sales, and an allocation of corporate costs supporting the program that are classified as Selling, General and Administrative Expenses. The impact to Cost of Sales in the six months ended June 30, 2022 and 2021 is $0.5 million and $4.6 million, respectively, for previously accrued contract losses attributable to work performed in the periods. As of June 30, 2022, a total of $19.6 million of previously accrued contract losses have been realized and the accrued contract loss balance included in Accounts Payable and Accrued Liabilities is $0. The Company has received aggregate cash payments under the HALEU Contract of $143.9 million through June 30, 2022.

As previously reported, the DOE experienced a COVID -19 related supply chain delay in obtaining the HALEU storage cylinders. As a result, the DOE elected to change the scope of the existing contract and move the operational portion of the demonstration to a new, competitively-awarded contract. The Company does not currently have a contractual obligation to perform work in excess of the funding provided by DOE. If the DOE does not commit to additional costs above the existing funding, the Company may incur material additional costs or losses in future periods that could have an adverse impact on its financial condition and liquidity.
On June 28, 2022, the DOE released a request for proposals (“RFP”) for the completion and operation of the demonstration cascade. The RFP provides for a 50/50 cost share contract for the initial phase to complete the cascade and produce 20 Kg of HALEU. Once 20 Kg of HALEU has been produced, the base contract will transition to a cost-plus-incentive-fee contract for production of 900 Kg over the subsequent 1-year period. The RFP includes options held by the DOE to extend performance up to an additional nine years, comprised of three options of three-years each, also on a cost-plus-incentive-fee basis.