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Revenue and Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2020
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,
20202019
United States$115.0 $112.1 
Foreign:
Belgium
35.8 21.5 
Japan
23.4 23.4 
Other
16.3 12.4 
Total foreign
75.5 57.3 
      Revenue - SWU and uranium$190.5 $169.4 
Revenue by customer location, including customers in a foreign country representing 10% or more of total revenue, follows (in millions):
Year Ended December 31,
20202019
United States$171.7 $152.4 
Foreign:
Belgium
35.8 21.5 
Japan
23.4 23.4 
Other
16.3 12.4 
Total foreign
75.5 57.3 
      Total revenue$247.2 $209.7 
* less than 10%
Contract with Customer, Asset and Liability
The following table presents changes in contract liability balances (in millions):
December 31,
20202019Change
Accrued loss on HALEU Contract:
Current - Accounts payable and accrued liabilities
$7.0 $10.0 $(3.0)
Noncurrent - Other long-term liabilities
$0.7 $8.3 $(7.6)
Deferred revenue - current
$281.7 $243.0 $38.7 
Advances from customers - current
$1.5 $23.3 $(21.8)
Advances from customers - noncurrent
$45.2 $29.4 $15.8