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Revenue Recognition and Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
United States
$
0.3

 
$
26.2

 
$
54.3

 
$
37.1

Europe
28.6

 
17.3

 
28.7

 
17.4

Asia
—

 
—

 
0.1

 
27.7

Revenue - SWU and uranium
$
28.9

 
$
43.5

 
$
83.1

 
$
82.2
Contract with Customer, Asset and Liability
The following table represents changes in our contract assets and contract liabilities balances (in millions):
 
 
September 30,
2018
 
January 1, 2018
 
Year-To-Date Change
Contract assets
 
 
 
 
 
 
Accounts receivable:
 
 
 
 
 
 
Billed
 
$
2.5

 
$
60.2

 
$
(57.7
)
Unbilled contract revenue
 
—

 
0.1

 
(0.1
)
Accounts receivable
 
$
2.5

 
$
60.3

 
$
(57.8
)
 
 
 
 
 
 
 
Deferred costs associated with deferred revenue
 
$
122.7

 
$
122.3

 
$
0.4

 
 
 
 
 
 
 
Contract liabilities
 
 
 
 
 
 
Deferred revenue and advances from customers - current:
 
 
 
 
 
 
Deferred revenue
 
$
175.6

 
$
172.5

 
$
3.1

Advances from customers
 
—

 
19.3

 
(19.3
)
Deferred revenue and advances from customers - current
 
$
175.6

 
$
191.8

 
$
(16.2
)
 
 
 
 
 
 
 
Advances from customers - noncurrent
 
$
14.5

 
$
—

 
$
14.5


Deferred cost and deferred revenue activity in the nine months ended September 30, 2018, follows (in millions):
 
Deferred Sales in the Period
 
Previously Deferred Sales Recognized in the Period
 
Year-To-Date Change
Deferred costs associated with deferred revenue
$
10.6

 
$
(10.2
)
 
$
0.4

Deferred revenue
23.3

 
(20.2
)
 
3.1