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Revenue and Contracts with Customers (Tables)
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
2025202420252024
United States$34.1 $— $142.5 $86.1 
Foreign 10.7 34.8 79.3 141.9
Revenue - SWU and uranium$44.8 $34.8 $221.8 $228.0 
Contract with Customer, Asset and Liability
The following table presents the components of accounts receivable (in millions):
September 30, 2025December 31, 2024
Accounts receivable:
Billed$44.1 $69.8 
Unbilled *16.6 10.2 
Accounts receivable$60.7 $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 and approved by the customer. 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.

Contract Liabilities

The following table presents changes in contract liability balances (in millions):
September 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)