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Revenue and Contracts with Customers (Tables)
9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas
The following table presents revenue from separative work units (“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,
2021202020212020
United States$13.8 $18.7 $68.6 $66.7 
Foreign 18.2 — 46.7 46.1 
Revenue - SWU and uranium$32.0 $18.7 $115.3 $112.8 
Contract with Customer, Asset and Liability
September 30,
2021
December 31, 2020Year-To-Date Change
Accrued loss on HALEU Contract:
Current - Accounts payable and accrued liabilities
$1.2 $7.0 $(5.8)
Noncurrent - Other long-term liabilities
$— $0.7 $(0.7)
Deferred revenue - current$259.1 $281.7 $(22.6)
Advances from customers - current$16.1 $1.5 $14.6 
Advances from customers - noncurrent$45.1 $45.2 $(0.1)