Revenue and Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 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 September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
United States	$	18.7	$	53.7	$	66.7	$	91.4
Foreign	—		34.1		46.1		34.1
Revenue - SWU and uranium	$	18.7	$	87.8	$	112.8	$	125.5

Contract with Customer, Asset and Liability

	September 30, 2020		December 31, 2019		Year-To-Date Change
Accrued loss on HALEU Contract:
Current - Accounts payable and accrued liabilities	$	8.9	$	10.0	$	(1.1)
Noncurrent - Other long-term liabilities	$	0.7	$	8.3	$	(7.6)
Deferred revenue - current	$	248.2	$	243.0	$	5.2
Advances from customers - current	$	1.5	$	23.3	$	(21.8)
Advances from customers - noncurrent	$	44.9	$	29.4	$	15.5