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Revenue and Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas
The following table presents revenue from SWU and uranium sales disaggregated by geographical region based on the billing addresses of customers (in millions):

Three Months Ended March 31,
20232022
United States$58.7 $12.6 
Foreign 0.1 5.1 
Revenue - SWU and uranium$58.8 $17.7 
Contract with Customer, Asset and Liability
March 31, 2023December 31, 2022
($ millions)
Accounts receivable:
Billed$25.7 $29.0 
Unbilled *7.2 9.1 
Other **1.2 — 
Accounts receivable$34.1 $38.1 
* Billings under certain contracts in the Technical Solutions 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.

**Other receivables relates to proceeds from the Company’s ATM issuances received after March 31, 2023. See Note 10, Stockholder’s Equity.
March 31, 2023December 31, 2022Year-To-Date Change
Accrued loss on HALEU Operation Contract:
Current - Accounts payable and accrued liabilities
$14.5 $20.0 $(5.5)
Deferred revenue - current$258.5 $258.4 $0.1 
Advances from customers - current$14.8 $14.8 $— 
Advances from customers - noncurrent$46.2 $46.2 $—