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Revenue and Contracts with Customers (Tables)
 12 Months Ended
Dec. 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, including foreign countries representing 10% or more of revenue, based on the billing addresses of customers (in millions):
Year Ended December 31,
202320222021
United States$230.4 $96.1 $108.3 
Foreign:
Belgium
0.1 38.3 36.6 
Japan
23.6 61.6 34.6 
Other
14.9 39.6 6.6 
Total foreign
38.6 139.5 77.8 
      Revenue - SWU and uranium$269.0 $235.6 $186.1 
Revenue by customer location, including customers in a foreign country representing 10% or more of total revenue, follows (in millions):
Year Ended December 31,
202320222021
United States$281.6 $154.3 $220.5 
Foreign:
Belgium
0.1 38.3 36.6 
Japan
23.6 61.6 34.6 
Other
14.9 39.6 6.6 
Total foreign
38.6 139.5 77.8 
      Total revenue$320.2 $293.8 $298.3 
Contract with Customer, Asset and Liability
The following table presents changes in contract liability balances (in millions):
December 31,
20232022Change
Accrued losses on HALEU Operation Contract:
Current - Accounts payable and accrued liabilities
$— $20.0 $(20.0)
Deferred revenue - current
$252.4 $258.4 $(6.0)
Advances from customers - current
$30.2 $14.8 $15.4 
Advances from customers - non current
$32.8 $46.2 $(13.4)