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Revenue and Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2025
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 June 30,Six Months Ended June 30,
2025202420252024
United States$57.2 $62.5 $108.5 $86.1 
Foreign 68.5 107.1 68.5 107.1
Revenue - SWU and uranium$125.7 $169.6 $177.0 $193.2 
Contract with Customer, Asset and Liability
June 30, 2025December 31, 2024
(in millions)
Accounts receivable:
Billed$21.4 $69.8 
Unbilled *9.9 10.2 
Accounts receivable$31.3 $80.0 
* 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 due to timing of invoice processing or pending the compilation of supporting documentation.
The following table presents changes in contract liability balances (in millions):
June 30, 
 2025		December 31, 
 2024		Year-To-Date Change
Deferred revenue - current$154.8 $183.6 $(28.8)
Advances from customers - current$— $32.8 $(32.8)