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Revenue and Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2022
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas
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 $83.3 
Contract with Customer, Asset and Liability
June 30, 2022December 31, 2021
($ 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.
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