Revenue and Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019		2018
United States	$	35.1	$	21.1
Foreign	—		0.2
Revenue - SWU and uranium	$	35.1	$	21.3

Contract with Customer, Asset and Liability

The following table represents changes in contract assets and contract liabilities balances (in millions):



	March 31, 2019		December 31, 2018		Year-To-Date Change
Contract assets
Accounts receivable:
Billed	$	39.5	$	50.4	$	(10.9	)
Uranium feed receivable	—		9.8		(9.8		)
Accounts receivable	$	39.5	$	60.2	$	(20.7	)

Deferred costs associated with deferred revenue	$	134.9	$	134.9	$	—

Contract liabilities
Deferred revenue - current	$	204.5	$	204.5	$	—
Advances from customers - noncurrent	$	15.0	$	15.0	$	—