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 March 31,
	2019		2018
United States	$	35.1	$	21.1
Foreign	—		0.2
Revenue - SWU and uranium	$	35.1	$	21.3

Refer to Note 13, Segment Information, for disaggregation of revenue by segment. Disaggregation by end-market is provided in Note 13 and the condensed consolidated statements of operations. SWU and uranium sales are made primarily to electric utility customers. Contract services revenue resulted primarily from services provided to government contractors and, in the first quarter of 2018, the settlement with DOE and the U.S. government. SWU and uranium revenue is recognized at point of sale and contract services revenue is generally recognized over time.

Contract Balances

The following table represents changes in contract assets and contract liabilities balances (in millions):



	March 31, 2019		December 31, 2018		Year-To-Date Change
Contract assets
Accounts receivable:
Billed	$	39.5	$	50.4	$	(10.9	)
Uranium feed receivable	—		9.8		(9.8		)
Accounts receivable	$	39.5	$	60.2	$	(20.7	)

Deferred costs associated with deferred revenue	$	134.9	$	134.9	$	—

Contract liabilities
Deferred revenue - current	$	204.5	$	204.5	$	—
Advances from customers - noncurrent	$	15.0	$	15.0	$	—

There was no deferred cost and deferred revenue activity for the three months ended March 31, 2019.

In the second quarter of 2018, the Company received uranium valued at $14.5 million from a customer that elected to defer a SWU purchase obligation for a period greater than one year. Under the contract, the customer has not received title to SWU or low-enriched uranium (“LEU”) product from the Company. The liability to the customer is included in Advances from Customers, a noncurrent liability. In December 2018, the Company borrowed $7.3 million of SWU from a customer under terms which require repayment within 48 months. The Company recorded the SWU and the related liability for the borrowing using an average purchase price over the borrowing period. The liability to the customer is included in Other Liabilities, which is included in noncurrent liabilities.

Revenue for the contract services segment, principally representing engineering and testing activities performed by the Company, as well as technical and resource support, is recognized over the contractual period as services are rendered. The contract services segment also includes limited services provided by Centrus to DOE and its contractors at the Piketon, Ohio site related to facilities the Company leases from DOE.

On January 11, 2018, the Company entered into a settlement agreement with DOE and the U.S. government regarding breach of contract claims relating to work performed by the Company under contracts with DOE and subcontracts with DOE contractors. DOE agreed to settle all claims raised as part of and subsequent to the litigation, except with respect to certain claims for pension and postretirement benefits, for a total of $24.0 million and provide a complete close out of all such contracts and subcontracts settled under the settlement agreement without any further audit or review of the Company’s costs or incurred cost submissions. Prior to the settlement, the Company had a receivables balance related to the claims being settled of $14.5 million. In 2018, the Company (a) received $4.7 million from the U.S. government, (b) applied approximately $19.3 million of advances from the U.S. government received in prior years against the receivables balance, and (c) recorded additional revenue of $9.5 million.

Centrus and DOE have yet to fully settle the Company’s claims for reimbursements for certain pension and postretirement benefits costs related to past contract work performed for DOE. There is the potential for additional revenue to be recognized for this work pending the outcome of legal proceedings related to the Company’s claims for payment and the potential release of previously established valuation allowances on receivables. As a result of the application of fresh start accounting following the Company’s emergence from Chapter 11 bankruptcy on September 30, 2014, the receivables related to the Company’s claims for payment are carried at fair value as of September 30, 2014, which is net of the valuation allowances. Refer to Note 12, Commitments and Contingencies.

LEU Segment Order Book

The SWU component of LEU is typically bought and sold under long-term contracts with deliveries over several years. The Company’s agreements for natural uranium sales are generally shorter-term, fixed-commitment contracts. The Company’s order book sales under contract in the LEU segment (“order book”) extends to 2030. The order book represents the Company’s remaining performance obligations under these contracts and includes the Deferred Revenue amounts in the Contract Balances table above. As of March 31, 2019, the order book was $1.1 billion, compared to $1.0 billion at December 31, 2018, reflecting completed deliveries and new contracts signed in the three months ended March 31, 2019.

Most of the Company’s contracts provide for fixed purchases of SWU during a given year. The Company’s estimate of the aggregate dollar amount of future SWU and uranium sales 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 is also based on the Company’s estimates of selling prices, which are 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.