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Revenue and Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2020
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 
 March 31,
 
2020
 
2019
United States
$
7.3

 
$
35.1

Foreign
23.4

 
—

Revenue - SWU and uranium
$
30.7

 
$
35.1
Contract with Customer, Asset and Liability
 
 
March 31,
2020
 
December 31, 2019
 
Year-To-Date Change
Accrued loss on HALEU Contract:
 
 
 
 
 
 
Current - Accounts payable and accrued liabilities
 
$
9.7

 
$
10.0

 
$
(0.3
)
Noncurrent - Other long-term liabilities
 
$
5.6

 
$
8.3

 
$
(2.7
)
Deferred revenue - current
 
$
243.0

 
$
243.0

 
$
—

Advances from customers - current
 
$
—

 
$
23.3

 
$
(23.3
)
Advances from customers - noncurrent
 
$
29.4

 
$
29.4

 
$
—