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Revenue and Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas
The following table presents SWU and uranium revenue 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,
202420232022
United States$161.3 $230.4 $96.1 
Foreign:
Belgium
— 0.1 38.3 
Japan
117.2 23.6 61.6 
Netherlands
42.4 — — 
Other
29.0 14.9 39.6 
Total foreign
188.6 38.6 139.5 
      Revenue - SWU and uranium$349.9 $269.0 $235.6 
Revenue by customer location, including customers in a foreign country representing 10% or more of total revenue, follows (in millions):
Year Ended December 31,
202420232022
United States$253.4 $281.6 $154.3 
Foreign:
Belgium
— 0.1 38.3 
Japan
117.2 23.6 61.6 
Netherlands
42.4 — — 
Other
29.0 14.9 39.6 
Total foreign
188.6 38.6 139.5 
      Total revenue$442.0 $320.2 $293.8 
Contract with Customer, Asset and Liability
The following table presents changes in contract liability balances (in millions):
December 31,
20242023Change
Deferred revenue - current
$183.6 $252.4 $(68.8)
Advances from customers - current
$32.8 $30.2 $2.6 
Advances from customers - noncurrent
$— $32.8 $(32.8)