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Revenue Recognition and Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas
The following table presents revenue from SWU and uranium sales disaggregated by geographical region based on the billing addresses of customers (in millions):
 
Three Months Ended 
 March 31,
 
2018
 
2017
United States
$
21.1

 
$
0.2

Asia
0.1

 
0.6

Other
0.1

 
—

Revenue - SWU and uranium
$
21.3

 
$
0.8
Contract with Customer, Asset and Liability
The following table represents changes in our contract assets and contract liabilities balances (in millions):
 
 
March 31, 2018
 
January 1, 2018
 
Year-To-Date Change
Contract assets
 
 
 
 
 
 
Accounts receivable:
 
 
 
 
 
 
Billed
 
$
15.0

 
$
60.2

 
$
(45.2
)
Unbilled contract revenue
 
—

 
0.1

 
(0.1
)
Accounts receivable
 
$
15.0

 
$
60.3

 
$
(45.3
)
 
 
 
 
 
 
 
Deferred costs associated with deferred revenue
 
$
119.6

 
$
122.3

 
$
(2.7
)
 
 
 
 
 
 
 
Contract liabilities
 
 
 
 
 
 
Deferred revenue and advances from customers:
 
 
 
 
 
 
Deferred revenue
 
$
169.9

 
$
172.5

 
$
(2.6
)
Advances from customers
 
0.3

 
19.3

 
(19.0
)
Deferred revenue and advances from customers
 
$
170.2

 
$
191.8

 
$
(21.6
)